servlet Archives - Ebhor.com

Sending data to servlet HTTP get method

September 28, 2023September 28, 2023 by manish

Here we will discuss Servlet HTTP get method What is a Servlet? A servlet is a Java-based program that runs on a web server. It handles client requests and generates dynamic web content. Servlets are an integral part of Java EE (Enterprise Edition) and are widely used for web development. HTTP GET Method The HTTP … Read more

How to get multiple parameters in ServletContext

September 22, 2023September 22, 2023 by manish

index.html

        <title>Servlet Context Multiple Parameters</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    
    

<h1>Servlet Context Multiple Parameters</h1>

        <a href="get-servlet-context">Get Multiple  parameters in servlet context</a>

<title>Servlet Context Multiple Parameters</title>

<h1>Servlet Context Multiple Parameters</h1>

<a href="get-servlet-context">Get Multiple parameters in servlet context</a>

web.xml

<!--?xml version="1.0" encoding="UTF-8"?-->
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <context-param>
        <param-name>SiteName</param-name>
        <param-value>Ebhor.com</param-value>
    </context-param>
    <context-param>
        <param-name>Description</param-name>
        <param-value>Provides free tutorials</param-value>
    </context-param>
    <servlet>
        <servlet-name>ServletContext</servlet-name>
        <servlet-class>ebhor.servlet.ServletContext</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServletContext</servlet-name>
        <url-pattern>/get-servlet-context</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
</web-app>

<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

<context-param>

<param-name>SiteName</param-name>

<param-value>Ebhor.com</param-value>

</context-param>

<context-param>

<param-name>Description</param-name>

<param-value>Provides free tutorials</param-value>

</context-param>

<servlet-name>ServletContext</servlet-name>

<servlet-class>ebhor.servlet.ServletContext</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ServletContext</servlet-name>

<url-pattern>/get-servlet-context</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>

</session-timeout>

</session-config>

</web-app>

ServletContext.java

package ebhor.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class ServletContext extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        Enumeration<string> params = getServletContext().getInitParameterNames();
        PrintWriter out = response.getWriter();
        out.println("
<h1>Getting multiple servlet context</h1>
");
        while (params.hasMoreElements()) {
            String name = params.nextElement();
            String value = getServletContext().getInitParameter(name);
            out.println("
<h2>" + name + ": " + value + "</h2>
");
        }

    }
}

</string>

package ebhor.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletContext extends HttpServlet {

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

Enumeration<string> params = getServletContext().getInitParameterNames();

PrintWriter out = response.getWriter();

out.println("

<h1>Getting multiple servlet context</h1>

");

while (params.hasMoreElements()) {

String name = params.nextElement();

String value = getServletContext().getInitParameter(name);

out.println("

<h2>" + name + ": " + value + "</h2>

");

}

</string>

Results Read More How to access ServletContext parameters How to access ServletConfig initial parameter value

Employee Management System JSP Servlet Project

September 22, 2023September 22, 2023 by manish

org. comp.model Employee Model – Employee.java

package org.comp.model;

import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Objects;

public class Employee implements Serializable {

	private static final long serialVersionUID = 1L;
	private Long id;
	private String name;
	private String department;
	private String designation;
	private BigDecimal salary;

	public Employee() {

	}

	public Employee(Long id, String name, String department, String designation, BigDecimal salary) {
		super();
		this.id = id;
		this.name = name;
		this.department = department;
		this.designation = designation;
		this.salary = salary;
	}

	@Override
	public String toString() {
		return "Employee [id=" + id + ", name=" + name + ", department=" + department + ", designation=" + designation
				+ ", salary=" + salary + "]";
	}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDepartment() {
		return department;
	}

	public void setDepartment(String department) {
		this.department = department;
	}

	public String getDesignation() {
		return designation;
	}

	public void setDesignation(String designation) {
		this.designation = designation;
	}

	public BigDecimal getSalary() {
		return salary;
	}

	public void setSalary(BigDecimal salary) {
		this.salary = salary;
	}

	public static long getSerialversionuid() {
		return serialVersionUID;
	}

}

package org.comp.model;

import java.io.Serializable;

import java.math.BigDecimal;

import java.util.Objects;

public class Employee implements Serializable {

private static final long serialVersionUID = 1L;

private Long id;

private String name;

private String department;

private String designation;

private BigDecimal salary;

public Employee() {

}

public Employee(Long id, String name, String department, String designation, BigDecimal salary) {

super();

this.id = id;

this.name = name;

this.department = department;

this.designation = designation;

this.salary = salary;

}

@Override

public String toString() {

return "Employee [id=" + id + ", name=" + name + ", department=" + department + ", designation=" + designation

+ ", salary=" + salary + "]";

}

public Long getId() {

return id;

}

public void setId(Long id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getDepartment() {

return department;

}

public void setDepartment(String department) {

this.department = department;

}

public String getDesignation() {

return designation;

}

public void setDesignation(String designation) {

this.designation = designation;

}

public BigDecimal getSalary() {

return salary;

}

public void setSalary(BigDecimal salary) {

this.salary = salary;

}

public static long getSerialversionuid() {

return serialVersionUID;

}

Employee Controller Servlet added org.comp.controller package is used for controller AddEmployee.Java

package org.comp.controller;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.comp.dao.EmployeeDAO;
import org.comp.model.Employee;
@WebServlet("/add-employee")
public class AddEmployee extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String name = request.getParameter("name");
		String department = request.getParameter("department");
		String designation = request.getParameter("designation");
		String salary = request.getParameter("salary");
		Employee e = new Employee();
		e.setName(name);
		e.setDepartment(department);
		e.setDesignation(designation);
		e.setSalary(new BigDecimal(salary));
		System.out.println(e);
		EmployeeDAO dao = new EmployeeDAO();
		dao.insert(e);
		List<Employee> employeeList = dao.fetchAll();
		request.setAttribute("employeeList", employeeList);
		int employeeCount = dao.count();
		request.setAttribute("employeeCount", employeeCount);
		RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");
		rd.forward(request, response);
	}
}

package org.comp.controller;

import java.io.IOException;

import java.math.BigDecimal;

import java.util.List;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.comp.dao.EmployeeDAO;

import org.comp.model.Employee;

@WebServlet("/add-employee")

public class AddEmployee extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String name = request.getParameter("name");

String department = request.getParameter("department");

String designation = request.getParameter("designation");

String salary = request.getParameter("salary");

Employee e = new Employee();

e.setName(name);

e.setDepartment(department);

e.setDesignation(designation);

e.setSalary(new BigDecimal(salary));

System.out.println(e);

EmployeeDAO dao = new EmployeeDAO();

dao.insert(e);

List<Employee> employeeList = dao.fetchAll();

request.setAttribute("employeeList", employeeList);

int employeeCount = dao.count();

request.setAttribute("employeeCount", employeeCount);

RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");

rd.forward(request, response);

}

FetchEmployee.java

package org.comp.controller;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.comp.dao.EmployeeDAO;
import org.comp.model.Employee;

@WebServlet("/update")
public class FetchEmployee extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Long id=Long.valueOf( request.getParameter("id"));
		EmployeeDAO dao = new EmployeeDAO();
		Employee employee = dao.fetch(id);
		System.out.println(employee);
		request.setAttribute("employee", employee);
		RequestDispatcher rd = request.getRequestDispatcher("/UpdateEmployee.jsp");
		rd.forward(request, response);
	}

}

package org.comp.controller;

import java.io.IOException;

import java.math.BigDecimal;

import java.util.List;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.comp.dao.EmployeeDAO;

import org.comp.model.Employee;

@WebServlet("/update")

public class FetchEmployee extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Long id=Long.valueOf( request.getParameter("id"));

EmployeeDAO dao = new EmployeeDAO();

Employee employee = dao.fetch(id);

System.out.println(employee);

request.setAttribute("employee", employee);

RequestDispatcher rd = request.getRequestDispatcher("/UpdateEmployee.jsp");

rd.forward(request, response);

}

UpdateEmployee.java

package org.comp.controller;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.comp.dao.EmployeeDAO;
import org.comp.model.Employee;
@WebServlet("/update-employee")
public class UpdateEmployee extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Long id = Long.valueOf(request.getParameter("id"));
		String name = request.getParameter("name");
		String department = request.getParameter("department");
		String designation = request.getParameter("designation");
		String salary = request.getParameter("salary");
		Employee e = new Employee();
		e.setId(id);
		e.setName(name);
		e.setDepartment(department);
		e.setDesignation(designation);
		e.setSalary(new BigDecimal(salary));
		System.out.println(e);
		EmployeeDAO dao = new EmployeeDAO();
		dao.update(e);
		List<Employee> employeeList = dao.fetchAll();
		request.setAttribute("employeeList", employeeList);
		int employeeCount = dao.count();
		request.setAttribute("employeeCount", employeeCount);
		RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");
		rd.forward(request, response);
	}
}

package org.comp.controller;

import java.io.IOException;

import java.math.BigDecimal;

import java.util.List;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.comp.dao.EmployeeDAO;

import org.comp.model.Employee;

@WebServlet("/update-employee")

public class UpdateEmployee extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Long id = Long.valueOf(request.getParameter("id"));

String name = request.getParameter("name");

String department = request.getParameter("department");

String designation = request.getParameter("designation");

String salary = request.getParameter("salary");

Employee e = new Employee();

e.setId(id);

e.setName(name);

e.setDepartment(department);

e.setDesignation(designation);

e.setSalary(new BigDecimal(salary));

System.out.println(e);

EmployeeDAO dao = new EmployeeDAO();

dao.update(e);

List<Employee> employeeList = dao.fetchAll();

request.setAttribute("employeeList", employeeList);

int employeeCount = dao.count();

request.setAttribute("employeeCount", employeeCount);

RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");

rd.forward(request, response);

}

showEmployee.java

package org.comp.controller;                                                                                
                                                                                                            
import java.io.IOException;                                                                                 
import java.math.BigDecimal;                                                                                
import java.util.List;                                                                                      
                                                                                                            
import javax.servlet.RequestDispatcher;                                                                     
import javax.servlet.ServletException;                                                                      
import javax.servlet.annotation.WebServlet;                                                                 
import javax.servlet.http.HttpServlet;                                                                      
import javax.servlet.http.HttpServletRequest;                                                               
import javax.servlet.http.HttpServletResponse;                                                              
                                                                                                            
import org.comp.dao.EmployeeDAO;                                                                            
import org.comp.model.Employee;                                                                             
                                                                                                            
@WebServlet("/show-employee")                                                                               
public class ShowEmployee extends HttpServlet {                                                             
	private static final long serialVersionUID = 1L;                                                        
                                                                                                            
	protected void doGet(HttpServletRequest request, HttpServletResponse response)                          
			throws ServletException, IOException {                                                          
		EmployeeDAO dao = new EmployeeDAO();                                                                
		List<Employee> employeeList = dao.fetchAll();                                                       
		int employeeCount = dao.count();                                                                    
		request.setAttribute("employeeList", employeeList);                                                 
		request.setAttribute("employeeCount", employeeCount);                                               
		RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");                          
		rd.forward(request, response);                                                                      
	}                                                                                                       
                                                                                                            
}

package org.comp.controller;

import java.io.IOException;

import java.math.BigDecimal;

import java.util.List;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.comp.dao.EmployeeDAO;

import org.comp.model.Employee;

@WebServlet("/show-employee")

public class ShowEmployee extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

EmployeeDAO dao = new EmployeeDAO();

List<Employee> employeeList = dao.fetchAll();

int employeeCount = dao.count();

request.setAttribute("employeeList", employeeList);

request.setAttribute("employeeCount", employeeCount);

RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");

rd.forward(request, response);

}

DeleteEmployee.java

package org.comp.controller;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.comp.dao.EmployeeDAO;
import org.comp.model.Employee;
@WebServlet("/delete")
public class DeleteEmployee extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		Long id =Long.valueOf(request.getParameter("id"));
		EmployeeDAO dao = new EmployeeDAO();
		int st = dao.delete(id);
		List<Employee> employeeList = dao.fetchAll();
		request.setAttribute("employeeList", employeeList);
		RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");
		rd.forward(request, response);
	}
}

package org.comp.controller;

import java.io.IOException;

import java.math.BigDecimal;

import java.util.List;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.comp.dao.EmployeeDAO;

import org.comp.model.Employee;

@WebServlet("/delete")

public class DeleteEmployee extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

Long id =Long.valueOf(request.getParameter("id"));

EmployeeDAO dao = new EmployeeDAO();

int st = dao.delete(id);

List<Employee> employeeList = dao.fetchAll();

request.setAttribute("employeeList", employeeList);

RequestDispatcher rd = request.getRequestDispatcher("/ListEmployees.jsp");

rd.forward(request, response);

}

Data Access Object ConnectionFactory.java

package org.comp.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectionFactory {

	public static Connection getConnection() {
		Connection c = null;
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			c = DriverManager.getConnection("jdbc:mysql://localhost:3306/sspu",
					"sspu_userx25", "MV7GG5TV2312");
		} catch (ClassNotFoundException e) {
			System.out.println("ClassNotFoundException " + e);
		} catch (SQLException e) {
			System.out.println("SQLException " + e);
		}
		return c;
	}
}

package org.comp.dao;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

public class ConnectionFactory {

public static Connection getConnection() {

Connection c = null;

try {

Class.forName("com.mysql.cj.jdbc.Driver");

c = DriverManager.getConnection("jdbc:mysql://localhost:3306/sspu",

"sspu_userx25", "MV7GG5TV2312");

} catch (ClassNotFoundException e) {

System.out.println("ClassNotFoundException " + e);

} catch (SQLException e) {

System.out.println("SQLException " + e);

}

return c;

}

EmployeeDAO.java

package org.comp.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import org.comp.model.Employee;
public class EmployeeDAO {
	Connection con = null;
	PreparedStatement ps = null;
	ResultSet rs = null;
	int st;// status
	public int insert(Employee employee) {
		con = ConnectionFactory.getConnection();
		try {
			String query = "insert into employee(name,department,designation,salary) " + "values(?,?,?,?)";
			ps = con.prepareStatement(query);
			ps.setString(1, employee.getName());
			ps.setString(2, employee.getDepartment());
			ps.setString(3, employee.getDesignation());
			ps.setBigDecimal(4, employee.getSalary());
			st = ps.executeUpdate();
			System.out.println("inserted employee " + st);
		} catch (Exception e) {
			st = -2;
			e.printStackTrace();
		} finally {
			try {
				con.close();
			} catch (SQLException ex) {
				ex.printStackTrace();
			}
		}
		return st;
	}
	public int update(Employee employee) {
		con = ConnectionFactory.getConnection();
		try {
			String query = "update employee set name=?,department=?,designation=?,salary=? where id=?";
			ps = con.prepareStatement(query);
			ps.setString(1, employee.getName());
			ps.setString(2, employee.getDepartment());
			ps.setString(3, employee.getDesignation());
			ps.setBigDecimal(4, employee.getSalary());
			ps.setLong(5, employee.getId());
			st = ps.executeUpdate();
			System.out.println("Updated employee " + st);
		} catch (Exception e) {
			st = -2;
			e.printStackTrace();
		} finally {
			try {
				con.close();
			} catch (SQLException ex) {
				ex.printStackTrace();
			}
		}
		return st;
	}
	public List<Employee> fetchAll() {
		List<Employee> employeeList = new ArrayList<Employee>();
		con = ConnectionFactory.getConnection();
		try {
			String query = "select * from employee order by name";
			ps = con.prepareStatement(query);
			rs = ps.executeQuery();
			while (rs.next()) {
				Employee employee = new Employee();
				employee.setId(rs.getLong("id"));
				employee.setName(rs.getString("name"));
				employee.setDepartment(rs.getString("department"));
				employee.setDesignation(rs.getString("designation"));
				employee.setSalary(rs.getBigDecimal("salary"));
				employeeList.add(employee);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				con.close();
			} catch (SQLException ex) {
				ex.printStackTrace();
			}
		}
		return employeeList;
	}
	public Employee fetch(long id) {
		Employee employee = null;
		con = ConnectionFactory.getConnection();
		try {
			String query = "select * from employee where id=?";
			ps = con.prepareStatement(query);
			ps.setLong(1, id);
			rs = ps.executeQuery();
			while (rs.next()) {
				employee = new Employee();
				employee.setId(rs.getLong("id"));
				employee.setName(rs.getString("name"));
				employee.setDepartment(rs.getString("department"));
				employee.setDesignation(rs.getString("designation"));
				employee.setSalary(rs.getBigDecimal("salary"));
				System.out.println(employee);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				con.close();
			} catch (SQLException ex) {
				ex.printStackTrace();
			}
		}
		return employee;
	}
	public int delete(Long id) {
		con = ConnectionFactory.getConnection();
		try {
			String query = "delete from employee where id=?";
			ps = con.prepareStatement(query);
			ps.setLong(1, id);
			st = ps.executeUpdate();
			System.out.println("Deleted employee " + st);
		} catch (Exception e) {
			st = -2;
			e.printStackTrace();
		} finally {
			try {
				con.close();
			} catch (SQLException ex) {
				ex.printStackTrace();
			}
		}
		return st;
	}
	public int count() {
		int count = 0;
		con = ConnectionFactory.getConnection();
		try {
			String query = "select count(*) from employee";
			ps = con.prepareStatement(query);
			ResultSet rs = ps.executeQuery();
			while (rs.next()) {
				count = rs.getInt(1);
			}
			System.out.println("Total employees " + count);
		} catch (Exception e) {
			st = -2;
			e.printStackTrace();
		} finally {
			try {
				con.close();
			} catch (SQLException ex) {
				ex.printStackTrace();
			}
		}
		return count;
	}
}

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package org.comp.dao;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import org.comp.model.Employee;

public class EmployeeDAO {

Connection con = null;

PreparedStatement ps = null;

ResultSet rs = null;

int st;// status

public int insert(Employee employee) {

con = ConnectionFactory.getConnection();

try {

String query = "insert into employee(name,department,designation,salary) " + "values(?,?,?,?)";

ps = con.prepareStatement(query);

ps.setString(1, employee.getName());

ps.setString(2, employee.getDepartment());

ps.setString(3, employee.getDesignation());

ps.setBigDecimal(4, employee.getSalary());

st = ps.executeUpdate();

System.out.println("inserted employee " + st);

} catch (Exception e) {

st = -2;

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return st;

}

public int update(Employee employee) {

con = ConnectionFactory.getConnection();

try {

String query = "update employee set name=?,department=?,designation=?,salary=? where id=?";

ps = con.prepareStatement(query);

ps.setString(1, employee.getName());

ps.setString(2, employee.getDepartment());

ps.setString(3, employee.getDesignation());

ps.setBigDecimal(4, employee.getSalary());

ps.setLong(5, employee.getId());

st = ps.executeUpdate();

System.out.println("Updated employee " + st);

} catch (Exception e) {

st = -2;

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return st;

}

public List<Employee> fetchAll() {

List<Employee> employeeList = new ArrayList<Employee>();

con = ConnectionFactory.getConnection();

try {

String query = "select * from employee order by name";

ps = con.prepareStatement(query);

rs = ps.executeQuery();

while (rs.next()) {

Employee employee = new Employee();

employee.setId(rs.getLong("id"));

employee.setName(rs.getString("name"));

employee.setDepartment(rs.getString("department"));

employee.setDesignation(rs.getString("designation"));

employee.setSalary(rs.getBigDecimal("salary"));

employeeList.add(employee);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return employeeList;

}

public Employee fetch(long id) {

Employee employee = null;

con = ConnectionFactory.getConnection();

try {

String query = "select * from employee where id=?";

ps = con.prepareStatement(query);

ps.setLong(1, id);

rs = ps.executeQuery();

while (rs.next()) {

employee = new Employee();

employee.setId(rs.getLong("id"));

employee.setName(rs.getString("name"));

employee.setDepartment(rs.getString("department"));

employee.setDesignation(rs.getString("designation"));

employee.setSalary(rs.getBigDecimal("salary"));

System.out.println(employee);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return employee;

}

public int delete(Long id) {

con = ConnectionFactory.getConnection();

try {

String query = "delete from employee where id=?";

ps = con.prepareStatement(query);

ps.setLong(1, id);

st = ps.executeUpdate();

System.out.println("Deleted employee " + st);

} catch (Exception e) {

st = -2;

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return st;

}

public int count() {

int count = 0;

con = ConnectionFactory.getConnection();

try {

String query = "select count(*) from employee";

ps = con.prepareStatement(query);

ResultSet rs = ps.executeQuery();

while (rs.next()) {

count = rs.getInt(1);

}

System.out.println("Total employees " + count);

} catch (Exception e) {

st = -2;

e.printStackTrace();

} finally {

try {

con.close();

} catch (SQLException ex) {

ex.printStackTrace();

}

return count;

}

HTML Pages ListEmployees.jsp

<%@page import="org.comp.model.Employee"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Employee List</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link
	href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css"
	rel="stylesheet">
<script
	src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body class="container-fluid">
	<div class="row">
		<jsp:include page="menu.jsp" />
	</div>
	<div class="row">
		<div class="col-2"></div>
		<div class="col-8">
			<h2>List of Employees ${employeeCount}</h2>
			<small></small><a href="AddEmployee.jsp">Add Employee</a></small>
			<table class="table table-bordered">
				<thead>
					<tr>
						<th>#</th>
						<th>Name</th>
						<th>Department</th>
						<th>Designation</th>
						<th>Salary</th>
						<th>Update</th>
						<th>Delete</th>
					</tr>
				</thead>
				<tbody>
					<c:forEach items="${employeeList}" var="employee" varStatus="loop">
						<tr>
							<td>${loop.index+1}</td>
							<td>${employee.name}</td>
							<td>${employee.department}</td>
							<td>${employee.designation}</td>
							<td>${employee.salary}</td>
							<td><a href="update?id=${employee.id}">Update</a></td>
							<td><a href="delete?id=${employee.id}">Delete</a></td>
						</tr>
					</c:forEach>
				</tbody>
			</table>
		</div>
		<div class="col-2"></div>
	</div>
	<div class="row">
		<jsp:include page="footer.jsp"></jsp:include>
	</div>
</body>
</html>

<%@page import="org.comp.model.Employee"%>

<%@page import="java.util.ArrayList"%>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1"%>

<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!DOCTYPE html>

<html>

<head>

<title>Employee List</title>

<link

href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"

rel="stylesheet">

<script

src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>

</head>

<jsp:include page="menu.jsp" />

</div>

<h2>List of Employees ${employeeCount}</h2>

<small></small><a href="AddEmployee.jsp">Add Employee</a></small>

<thead>

<tr>

<th>Department</th>

<th>Designation</th>

<th>Salary</th>

<th>Update</th>

<th>Delete</th>

</tr>

</thead>

<tbody>

<c:forEach items="${employeeList}" var="employee" varStatus="loop">

<tr>

<td>${loop.index+1}</td>

<td>${employee.name}</td>

<td>${employee.department}</td>

<td>${employee.designation}</td>

<td>${employee.salary}</td>

<td><a href="update?id=${employee.id}">Update</a></td>

<td><a href="delete?id=${employee.id}">Delete</a></td>

</tr>

</c:forEach>

</tbody>

</table>

</div>

</div>

<jsp:include page="footer.jsp"></jsp:include>

</div>

</body>

</html>

AddEmployee.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link
	href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css"
	rel="stylesheet">
<script
	src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body class="container-fluid">
	<div class="row">
		<jsp:include page="menu.jsp" />
	</div>
	<div class="row">
		<div class="col-2"></div>
		<div class="col-8">
			<h2>Add New Employee</h2>
			<form id="add-employee" action="add-employee" method="post">
				<div class="mb-3 mt-3">
					<label for="name">Name</label> <input type="text"
						class="form-control" id="name" placeholder="Name" name="name"
						required>
				</div>
				<div class="mb-3">
					<label for="department">Department</label> <input type="text"
						class="form-control" id="department"
						placeholder="Enter Department" name="department" required />
				</div>
				<div class="mb-3 mt-3">
					<label for="designation">Designation</label> <input type="text"
						class="form-control" id="designation"
						placeholder="Enter Designation" name="designation" required />
				</div>
				<div class="mb-3">
					<label for="salary">Salary</label> <input type="number"
						class="form-control" id="salary" placeholder="Enter Salary"
						name="salary" required />
				</div>
				<button type="submit" class="btn btn-primary">Add Employee</button>
			</form>
		</div>
		<div class="col-2"></div>
	</div>
	<div class="row">
		<jsp:include page="footer.jsp" />
	</div>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1"%>

<!DOCTYPE html>

<html>

<head>

<title>Insert title here</title>

<link

href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"

rel="stylesheet">

<script

src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>

</head>

<jsp:include page="menu.jsp" />

</div>

<h2>Add New Employee</h2>

<label for="name">Name</label> <input type="text"

class="form-control" id="name" placeholder="Name" name="name"

required>

</div>

<label for="department">Department</label> <input type="text"

class="form-control" id="department"

placeholder="Enter Department" name="department" required />

</div>

<label for="designation">Designation</label> <input type="text"

class="form-control" id="designation"

placeholder="Enter Designation" name="designation" required />

</div>

<label for="salary">Salary</label> <input type="number"

class="form-control" id="salary" placeholder="Enter Salary"

name="salary" required />

</div>

<button type="submit" class="btn btn-primary">Add Employee</button>

</form>

</div>

</div>

<jsp:include page="footer.jsp" />

</div>

</body>

</html>

UpdateEmployee.jsp

<%@page import="org.comp.model.Employee"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link
	href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css"
	rel="stylesheet">
<script
	src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body class="container-fluid">
	<div class="row">
		<jsp:include page="menu.jsp" />
	</div>
	<div class="row">
		<div class="col-2"></div>
		<div class="col-8">
			<h2>Update Employee</h2>
			<form id="update-employee" action="update-employee" method="post">
				<div class="mb-3 mt-3">
					<label for="name">Name</label> <input type="text"
						class="form-control" id="name" placeholder="Name" name="name"
						value="${employee.name}" required /> <input type="hidden"
						name="id" value="${employee.id}" />
				</div>
				<div class="mb-3">
					<label for="department">Department</label> <input type="text"
						class="form-control" id="department"
						placeholder="Enter Department" name="department"
						value="${employee.department}" required />
				</div>
				<div class="mb-3 mt-3">
					<label for="designation">Designation</label> <input type="text"
						class="form-control" id="designation"
						placeholder="Enter Designation" name="designation"
						value="${employee.designation}" required />
				</div>
				<div class="mb-3">
					<label for="salary">Salary</label> <input type="number"
						class="form-control" id="salary" placeholder="Enter Salary"
						name="salary" value=${employee.salary } required />
				</div>
				<button type="submit" class="btn btn-primary">Update
					Employee</button>
			</form>
		</div>
		<div class="col-2"></div>
	</div>
	<div class="row">
		<jsp:include page="footer.jsp" />
	</div>
</body>
</html>

<%@page import="org.comp.model.Employee"%>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

pageEncoding="ISO-8859-1"%>

<!DOCTYPE html>

<html>

<head>

<title>Insert title here</title>

<link

href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"

rel="stylesheet">

<script

src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>

</head>

<jsp:include page="menu.jsp" />

</div>

<h2>Update Employee</h2>

<label for="name">Name</label> <input type="text"

class="form-control" id="name" placeholder="Name" name="name"

value="${employee.name}" required /> <input type="hidden"

name="id" value="${employee.id}" />

</div>

<label for="department">Department</label> <input type="text"

class="form-control" id="department"

placeholder="Enter Department" name="department"

value="${employee.department}" required />

</div>

<label for="designation">Designation</label> <input type="text"

class="form-control" id="designation"

placeholder="Enter Designation" name="designation"

value="${employee.designation}" required />

</div>

<label for="salary">Salary</label> <input type="number"

class="form-control" id="salary" placeholder="Enter Salary"

name="salary" value=${employee.salary } required />

</div>

<button type="submit" class="btn btn-primary">Update

Employee</button>

</form>

</div>

</div>

<jsp:include page="footer.jsp" />

</div>

</body>

</html>

menu.jsp

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
	<div class="container-fluid">
		<a class="navbar-brand" href="#">Employee Management</a>
		<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNavDarkDropdown" aria-controls="navbarNavDarkDropdown" aria-expanded="false" aria-label="Toggle navigation">
			<span class="navbar-toggler-icon"></span>
		</button>
		<div class="collapse navbar-collapse" id="navbarNavDarkDropdown">
			<ul class="navbar-nav me-auto mb-2 mb-lg-0">
				<li class="nav-item"><a class="nav-link active" aria-current="page" href="/EmployeeManagement">Home</a></li>
				<li class="nav-item"><a class="nav-link active" aria-current="page" href="/EmployeeManagement">Show</a></li>
				<li class="nav-item"><a class="nav-link active" aria-current="page" href="AddEmployee.jsp">Add</a></li>
			</ul>
		</div>
	</div>
</nav>

<a class="navbar-brand" href="#">Employee Management</a>

</button>

</ul>

</div>

</nav>

footer.jsp

<div class="container">
	<footer class="py-3 my-4">
		<ul class="nav justify-content-center border-bottom pb-3 mb-3">
			<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">Home</a></li>
			<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">Features</a></li>
			<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">About</a></li>
			<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">Contact</a></li>
			<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">FAQ's</a></li>
		</ul>
		<p class="text-center text-muted">© 2021 Company, Inc</p>
	</footer>
</div>

<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">Features</a></li>

<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">About</a></li>

<li class="nav-item"><a href="#" class="nav-link px-2 text-muted">Contact</a></li>

</ul>

</footer>

</div>

Servlet Annotation WebServlet Example

September 22, 2023September 22, 2023 by manish

The first example is to show Servlet Welcome using Servlet Annotation WebServlet. For this we have created an index.html page on index.html we have created a link. On clicking on link it will call welcome servlet. Our project directory structure is as per below index.jsp

&lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt;

1	<%@page contentType="text/html" pageEncoding="UTF-8"%>

Show welcome servlet

Welcome.java

package ebhor.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "Welcome", urlPatterns = {"/welcome"})
public class Welcome extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            out.println("");
            out.println("");
            out.println("");
            out.println("");
            out.println("");
            out.println("");
            out.println("

package ebhor.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "Welcome", urlPatterns = {"/welcome"})

public class Welcome extends HttpServlet {

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();

try {

out.println("");

out.println("

Servlet Welcome

");
            out.println("");
            out.println("");
        } finally {
            out.close();
        }
    }

}

");

out.println("");

} finally {

out.close();

}

Servlet Maven Configuration Example

September 22, 2023September 22, 2023 by manish

Maven is the Project Management Tool, that helps developers to build the project easily (make create, add, update, compile, test, and deploy work easily). You can download Maven from Official Site You can find the servlet dependency file here Technologies used here are as below Here we will start a new project with maven Select … Read more

getting all request parameters in servlet

September 22, 2023September 22, 2023 by manish

before this we have used request.getParameter(String) which is used to get a single request parameter value. Now if we want to get all parameter names then we have to use request.getParameterNames() it returns Enumeration of String objects of all parameter names. After getting all parameter names we can get its value using request.getParameter(String) . request.getParameterNames() … Read more

ServletConfig to access multiple initial parameter value

September 22, 2023September 22, 2023 by manish

ServletConfig is ued to configure the servlet. We can configure values in the ServletConfig object and can access them later on. There can one or more values can be stored. ServletConfig stores values in key values pair. ServletConfig to access initial parameter value All values are stored in key-value pairs in <servlet> the tag in … Read more

How to insert data in MySql Using JSP Servlet & JDBC

September 22, 2023September 22, 2023 by manish

Here we will insert data in MySQL using JSP Servlet and JDBC. Here We will fetch Data from the JSP page and pass it to Servlet then DAO which contains JDBC code to store data in the MySQL database. How To Get Data From Database To Servlet Jdbc JSP Technology used Steps for Data insertion … Read more

How to access ServletContext parameters

August 26, 2023August 26, 2023 by manish

index.html

        <title>Servlet Context Example</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    
    

<h3>Servlet Context Example</h3>

        <a href="get-servlet-context">Call Servlet1</a>
        <a href="get-context">Call Servlet2</a>

<title>Servlet Context Example</title>

<h3>Servlet Context Example</h3>

<a href="get-servlet-context">Call Servlet1</a>

<a href="get-context">Call Servlet2</a>

web.xml

<!--?xml version="1.0" encoding="UTF-8"?-->
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <context-param>
        <param-name>SiteName</param-name>
        <param-value>Ebhor.com</param-value>
    </context-param>
    <servlet>
        <servlet-name>ServletContext</servlet-name>
        <servlet-class>ebhor.servlet.ServletContext</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>ServletContext1</servlet-name>
        <servlet-class>ebhor.servlet.ServletContext1</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServletContext</servlet-name>
        <url-pattern>/get-servlet-context</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>ServletContext1</servlet-name>
        <url-pattern>/get-context</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
</web-app>

<context-param>

<param-name>SiteName</param-name>

<param-value>Ebhor.com</param-value>

</context-param>

<servlet-name>ServletContext</servlet-name>

<servlet-class>ebhor.servlet.ServletContext</servlet-class>

</servlet>

<servlet-name>ServletContext1</servlet-name>

<servlet-class>ebhor.servlet.ServletContext1</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ServletContext</servlet-name>

<url-pattern>/get-servlet-context</url-pattern>

</servlet-mapping>

<servlet-mapping>

<servlet-name>ServletContext1</servlet-name>

<url-pattern>/get-context</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>

</session-timeout>

</session-config>

</web-app>

ServletContext.java

package ebhor.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletContext extends HttpServlet {
   
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       response.setContentType("text/html");
       String value=getServletContext().getInitParameter("SiteName");
       PrintWriter out=response.getWriter();
         out.println("At ServletContext servlet ");
       out.println("
<h2>Site Name is "+value+"</h2>
");
    }

   
}

package ebhor.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletContext extends HttpServlet {

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

String value=getServletContext().getInitParameter("SiteName");

PrintWriter out=response.getWriter();

out.println("At ServletContext servlet ");

out.println("

<h2>Site Name is "+value+"</h2>

");

}

ServletContext1.java

package ebhor.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class ServletContext1 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        String value = getServletContext().getInitParameter("SiteName");
        PrintWriter out = response.getWriter();
        out.println("At ServletContext1 servlet ");
        out.println("
<h2>Site Name is " + value + "</h2>
");
    }
}

package ebhor.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletContext1 extends HttpServlet {

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

String value = getServletContext().getInitParameter("SiteName");

PrintWriter out = response.getWriter();

out.println("At ServletContext1 servlet ");

out.println("

<h2>Site Name is " + value + "</h2>

");

}

Results

How to access ServletConfig initial parameter value

August 26, 2023August 26, 2023 by manish

java servlet are executed when user request for some resource in server. ServletConfig is interface defined in javax.servlet package. ServletConfig is used to access servlet’s initial value stored in web.xml. For each servlet there is one ServletConfig. Initial value for servlet are stored in web.xml with name value pair as follows

<servlet>
        <servlet-name>ServletName</servlet-name>
        <servlet-class>ServletClass</servlet-class>
        <init-param>
            <param-name>Param1</param-name>
            <param-value>Value1</param-value>
        </init-param>
      <init-param>
            <param-name>Param2</param-name>
            <param-value>Value2</param-value>
        </init-param>
        .......

    </servlet>
   <servlet-mapping>
        <servlet-name>ServletName</servlet-name>
        <url-pattern>/url-pattern</url-pattern>
    </servlet-mapping>

<servlet-name>ServletName</servlet-name>

<servlet-class>ServletClass</servlet-class>

<init-param>

<param-name>Param1</param-name>

<param-value>Value1</param-value>

</init-param>

<init-param>

<param-name>Param2</param-name>

<param-value>Value2</param-value>

</init-param>

.......

</servlet>

<servlet-mapping>

<servlet-name>ServletName</servlet-name>

<url-pattern>/url-pattern</url-pattern>

</servlet-mapping>

initial parameter are … Read more