可按照比例縮放，也可以指定寬高

import com.sun.image.codec.jpeg.JPEGImageEncoder;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGEncodeParam;import javax.swing.*;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.awt.*;import java.awt.image.BufferedImage;import java.awt.image.Kernel;import java.awt.image.ConvolveOp; public class ImageUtil { /** * * @param originalFile 原文件 * @param resizedFile 壓縮目標文件 * @param newWidth 壓縮后的圖片寬度 * @param quality 壓縮質量（0到1之間，越高質量越好） * @throws IOException */public static void resize(File originalFile, File resizedFile,int newWidth, float quality) throws IOException { if (quality > 1) {throw new IllegalArgumentException('Quality has to be between 0 and 1');} ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());Image i = ii.getImage();Image resizedImage = null; int iWidth = i.getWidth(null);int iHeight = i.getHeight(null);//比例縮放if (iWidth > iHeight) {resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)/ iWidth, Image.SCALE_SMOOTH);} else {resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,newWidth, Image.SCALE_SMOOTH);}//指定寬高Image temp = new ImageIcon(resizedImage).getImage();// Create the buffered image.BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),temp.getHeight(null), BufferedImage.TYPE_INT_RGB);// Copy image to buffered image.Graphics g = bufferedImage.createGraphics();// Clear background and paint the image.g.setColor(Color.white);g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));g.drawImage(temp, 0, 0, null);g.dispose(); // Soften.float softenFactor = 0.05f;float[] softenArray = { 0, softenFactor, 0, softenFactor,1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };Kernel kernel = new Kernel(3, 3, softenArray);ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);bufferedImage = cOp.filter(bufferedImage, null); // Write the jpeg to a file.FileOutputStream out = new FileOutputStream(resizedFile); // Encodes image as a JPEG data streamJPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bufferedImage); param.setQuality(quality, true); encoder.setJPEGEncodeParam(param);encoder.encode(bufferedImage);} // Example usage public static void main(String[] args) throws IOException { File originalImage = new File('C:P7.gif'); resize(originalImage, new File('c:P7-0.jpg'),150, 0.7f); resize(originalImage, new File('c:P7-1.jpg'),150, 1f);}}

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