With this example we are going to learn how to compress a JPEG file. When saving space is important for your system, you have to consider compressing your images using JPEG format. This format compresses the image but its high quality can be preserved.

In order to compress a JPEG file all you have to do is:

• Open a new file to the image usingnewFile("myimage.jpg").
• Create a BufferedImage usingImageIO.read(is).
• Get an image writer usingImageIO.getImageWritersByFormatName("jpg").
• Create aImageWriteParam.
• UsesetCompressionMode(ImageWriteParam.MODE_EXPLICIT) to set the compression mode.
• UsesetCompressionQuality(quality) to set the compression quality.
• Usewriter.write(null, new IIOImage(image, null, null), param) that appends a complete image stream containing a single image and associated stream and image metadata and thumbnails to the output.

Let’s see the code:

package com.javacodegeeks.snippets.desktop;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.Iterator;import javax.imageio.IIOImage;import javax.imageio.ImageIO;import javax.imageio.ImageWriteParam;import javax.imageio.ImageWriter;import javax.imageio.stream.ImageOutputStream;public class CompressJPEGFile {public static void main(String[] args) throws IOException {File imageFile = new File("myimage.jpg");File compressedImageFile = new File("myimage_compressed.jpg");InputStream is = new FileInputStream(imageFile);OutputStream os = new FileOutputStream(compressedImageFile);float quality = 0.5f;// create a BufferedImage as the result of decoding the supplied InputStreamBufferedImage image = ImageIO.read(is);// get all image writers for JPG formatIterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");if (!writers.hasNext())throw new IllegalStateException("No writers found");ImageWriter writer = (ImageWriter) writers.next();ImageOutputStream ios = ImageIO.createImageOutputStream(os);writer.setOutput(ios);ImageWriteParam param = writer.getDefaultWriteParam();// compress to a given qualityparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);param.setCompressionQuality(quality);// appends a complete image stream containing a single image and    //associated stream and image metadata and thumbnails to the outputwriter.write(null, new IIOImage(image, null, null), param);// close all streamsis.close();os.close();ios.close();writer.dispose();}}

 
This was an example on how to compress a JPEG file.

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