java Archives

Reading title and description of URL using jsoup

February 1, 2023February 1, 2023 by manish

This is a sample program to read title and description of specified url. Wh have used java html parser jsoup for this program. for that you have to include jsoup-1.7.2.jar(used in this program). First we have to connect to url using Document doc Jsoup.connect(url).get(); To get title call title() that will return String value String … Read more

High quality thumbnail generation in java

February 1, 2023January 31, 2023 by manish

I am generating high quality thumbnail in java for that I am using java-image-scaling High quality image scaling library which is provided under Change license to The BSD 3-Clause License For running this program you have to include java-image-scaling-0.8.6.jar and Filter.jar This is example to generate thumbnail with maintaining aspect ratio

import com.mortennobel.imagescaling.AdvancedResizeOp;
import com.mortennobel.imagescaling.ResampleOp;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;

public class Test {

    public static void main(String[] args) throws IOException, Exception {
        Test tt = new Test();
        String sourceImagePath = "D:\\tt.jpg";
        String destinationPath = "D:\\tt1";
        String smallPath = "D:\\tt2";
        int pos = sourceImagePath.lastIndexOf(".");
        String imgFormat = sourceImagePath.substring(pos + 1);
        String thumbnailImage = destinationPath.concat(".").concat(imgFormat);
        String smallImg = smallPath.concat(".").concat(imgFormat);
        tt.getThumbnail(sourceImagePath, thumbnailImage, imgFormat, 500, 400);
        tt.getThumbnail(sourceImagePath, smallImg, imgFormat, 50, 50);
      }

    public void getThumbnail(String sourceImage, String thumbnailImage, String imgFormat, int picWidth, int picHeight)
            throws Exception {
        System.out.println(sourceImage + "  " + thumbnailImage + " " + picWidth + "  " + picHeight);

        Image image = javax.imageio.ImageIO.read(new File(sourceImage));
        double thumbRatio = (double) picWidth / (double) picHeight;
        int imageWidth = image.getWidth(null);
        int imageHeight = image.getHeight(null);
        double imageRatio = (double) imageWidth / (double) imageHeight;

        if (thumbRatio &lt; imageRatio) {
            picHeight = (int) (picWidth / imageRatio);
        } else {
            picWidth = (int) (picHeight * imageRatio);
        }

        if ((imageWidth &lt; picWidth) &amp;&amp; (imageHeight &lt; picHeight)) {
            picWidth = imageWidth;
            picHeight = imageHeight;
        } else if (imageWidth &lt; picWidth) {
            picWidth = imageWidth;
        } else if (imageHeight &lt; picHeight) {
            picHeight = imageHeight;
        }
        File f = new File(sourceImage);
        BufferedImage src = ImageIO.read(f);
        ResampleOp resampleOp = new ResampleOp(picWidth, picHeight);
        resampleOp.setUnsharpenMask(AdvancedResizeOp.UnsharpenMask.Soft);
        BufferedImage rescaled = resampleOp.filter(src, null);
        ImageIO.write(rescaled, imgFormat, new File(thumbnailImage));
   }

}

import com.mortennobel.imagescaling.AdvancedResizeOp;

import com.mortennobel.imagescaling.ResampleOp;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.imageio.ImageIO;

public class Test {

public static void main(String[] args) throws IOException, Exception {

Test tt = new Test();

String sourceImagePath = "D:\\tt.jpg";

String destinationPath = "D:\\tt1";

String smallPath = "D:\\tt2";

int pos = sourceImagePath.lastIndexOf(".");

String imgFormat = sourceImagePath.substring(pos + 1);

String thumbnailImage = destinationPath.concat(".").concat(imgFormat);

String smallImg = smallPath.concat(".").concat(imgFormat);

tt.getThumbnail(sourceImagePath, thumbnailImage, imgFormat, 500, 400);

tt.getThumbnail(sourceImagePath, smallImg, imgFormat, 50, 50);

}

public void getThumbnail(String sourceImage, String thumbnailImage, String imgFormat, int picWidth, int picHeight)

throws Exception {

System.out.println(sourceImage + " " + thumbnailImage + " " + picWidth + " " + picHeight);

Image image = javax.imageio.ImageIO.read(new File(sourceImage));

double thumbRatio = (double) picWidth / (double) picHeight;

int imageWidth = image.getWidth(null);

int imageHeight = image.getHeight(null);

double imageRatio = (double) imageWidth / (double) imageHeight;

if (thumbRatio < imageRatio) {

picHeight = (int) (picWidth / imageRatio);

} else {

picWidth = (int) (picHeight * imageRatio);

}

if ((imageWidth < picWidth) && (imageHeight < picHeight)) {

picWidth = imageWidth;

picHeight = imageHeight;

} else if (imageWidth < picWidth) {

picWidth = imageWidth;

} else if (imageHeight < picHeight) {

picHeight = imageHeight;

}

File f = new File(sourceImage);

BufferedImage src = ImageIO.read(f);

ResampleOp resampleOp = new ResampleOp(picWidth, picHeight);

resampleOp.setUnsharpenMask(AdvancedResizeOp.UnsharpenMask.Soft);

BufferedImage rescaled = resampleOp.filter(src, null);

ImageIO.write(rescaled, imgFormat, new File(thumbnailImage));

}

Java Program Structure and First Program

January 30, 2023January 30, 2023 by manish

Here we will see the structure of the java program and create a java first program in notepad and run it 1. Structure of Java Program Let’s see the basic structure of the java program class className { //main method of java program public static void main(String args[]) { //program execution starts from main method … Read more

Super keyword in Java with uses and examples

January 27, 2023January 26, 2023 by manish

What is Super keyword in Java A Super keyword in java is a keyword used to access immediate parent class instance variable, methods and constructors. java super keyword used in classes where inheritance hierarchy exists. Uses of super keyword in Java In Java super keyword is used when a sub class wants to refer its … Read more

How to create a database in MySQL with connection object conn (Student Class Example)

January 25, 2023January 24, 2023 by manish

Java code for inserting data into the database is done using JDBC (Java Database connectivity). JDBC is an API to connect the java programs to various databases like MySql, Oracle, MSAccess, etc. Here Step by step tutorial to insert data from java into the database. Here MySql or MariaDB database is used for this purpose. … Read more

Even or odd program in java

January 25, 2023January 24, 2023 by manish

The number which is divisible by 2 is known as even number and the number which is not divisible by 2 is odd number. in programming we use % operator to check divisibility. The % operator returns the remainder of division. If a number is completely divisible its remainder is 0. So any number is … Read more

Splitting the strings in words

January 24, 2023January 23, 2023 by Manish Sahu

public class StringSplit {

    public static void main(String[] s) {
        String sentence = "The Java language was designed at Sun Microsystems over a five year "
+"period, culminating in its first release in January 1996";
        StringSplit st = new StringSplit();
        st.split(sentence);
    }

    public void split(String sentence) {
        String[] words = sentence.split(" ");
        System.out.println("Words are:");
        for(String word: words)
        {
             System.out.println(word);
        }
        
    }
}

public class StringSplit {

public static void main(String[] s) {

String sentence = "The Java language was designed at Sun Microsystems over a five year "

+"period, culminating in its first release in January 1996";

StringSplit st = new StringSplit();

st.split(sentence);

}

public void split(String sentence) {

String[] words = sentence.split(" ");

System.out.println("Words are:");

for(String word: words)

{

System.out.println(word);

}

String reverse program in java

September 16, 2023January 20, 2023 by manish

In Java, you can reverse a string in several ways. Here are three common methods to reverse a string: String reverse program in java using StringBuilder public class StringReverseExample { public static void main(String[] args) { String original = “Hello, World!”; StringBuilder reversed = new StringBuilder(original).reverse(); String reversedString = reversed.toString(); System.out.println(“Reversed string: ” + reversedString); … Read more

Thread suspend() and resume() method in Java

January 24, 2023January 20, 2023 by manish

suspend() : This method suspend a thread for sometime but do not kill/terminate it. resume() : This method revives the suspended thread. class A extends Thread { public void run() { for (int i = 1; i

Java Applet Example

January 21, 2023January 20, 2023 by manish

To run applets we use appletviewer . An appletviewer is command line program to invoke an applet program from command line. Here we will see how to run applet from applet viewer Example : Write a simple applet program to print “ Hello Students” import java.applet.Applet; import java.awt.Graphics; /* */ public class APdemo extends Applet { String … Read more