package com.qq.client.tools; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import javax.imageio.ImageIO; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class JpgChange {     // path 路径 ,旧文件名称 ,新文件名称,n 改变倍数     public void changeImage(String path, String oldimg, String newimg, int n) {        try {            File file = new File(path + oldimg);            Image img = ImageIO.read(file);            // 构造Image对象            int wideth = img.getWidth(null); // 得到源图宽            int height = img.getHeight(null); // 得到源图长            BufferedImage tag = new BufferedImage(n * wideth, n * height,                   BufferedImage.TYPE_INT_RGB);            tag.getGraphics().drawImage(img, 0, 0, n * wideth, n * height, null);            FileOutputStream out = new FileOutputStream(path + newimg);            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);            encoder.encode(tag); // 近JPEG编码            out.close();        } catch (IOException e) {            System.out.println("处理文件出现异常");            e.printStackTrace();        }     }     public static void main(String[] args) {        JpgChange jc = new JpgChange();        jc.changeImage("E:\\", "1.bmp", "2.bmp", 3);     } }