Servlet url and class mapping using web.xml

We can map url pattern with servlet class at web.xml.

Following example will illustrate this.

Project directory structure is as below:

index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Configuration using web.xml </h1>
        <a href="welcome1">Show Welcome1</a>
    </body>
</html>

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

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>Configuration using web.xml </h1>

<a href="welcome1">Show Welcome1</a>

</body>

</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
   

    <display-name>Servlet Tutorial 1</display-name>
    <description>
        This is a simple web application. To map url with srvlet class at web.xml
    </description>

    <servlet>
        <servlet-name>welcome</servlet-name>
        <servlet-class>ebhor.servlet.Welcome1</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>welcome</servlet-name>
        <url-pattern>/welcome1</url-pattern>
    </servlet-mapping>

</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

<display-name>Servlet Tutorial 1</display-name>

This is a simple web application. To map url with srvlet class at web.xml

</description>

<servlet-name>welcome</servlet-name>

<servlet-class>ebhor.servlet.Welcome1</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>welcome</servlet-name>

<url-pattern>/welcome1</url-pattern>

</servlet-mapping>

</web-app>

Welcome1.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 Welcome1 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("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Welcome1</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet Welcome1 </h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
        }
    }
}

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 Welcome1 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("<!DOCTYPE html>");

out.println("<html>");

out.println("<head>");

out.println("<title>Servlet Welcome1</title>");

out.println("</head>");

out.println("<body>");

out.println("<h1>Servlet Welcome1 </h1>");

out.println("</body>");

out.println("</html>");

} finally {

out.close();

}

In web.xml url pattern(welcome1) will match to a logical name(welcome) that logical name is matched with servlet fully qualified class name(ebhor.servlet.Welcome1).

Result:
2_first

2_second