I/O流实现图片压缩

import java.awt.Graphics;   
import java.awt.image.BufferedImage;   
import java.io.File;   
import java.io.IOException;   
import javax.imageio.ImageIO;   
  
public class ImageTest {          
  
    public static void main(String[] args) throws IOException {   
        File file1 = new File("0.png");   
        File file2 = new File("1.png");   
        mergeImage(file1, file2);   
    }   
    public static void mergeImage(File file1, File file2) throws IOException {         
        BufferedImage image1 = ImageIO.read(file1);   
        BufferedImage image2 = ImageIO.read(file2);   
  
        BufferedImage combined = new BufferedImage(image1.getWidth() * 2, image1.getHeight(), BufferedImage.TYPE_INT_RGB);   
  
        // paint both images, preserving the alpha channels   
        Graphics g = combined.getGraphics();   
        g.drawImage(image1, 0, 0, null);   
        g.drawImage(image2, image1.getWidth(), 0, null);   
           
        // Save as new image   
        ImageIO.write(combined, "png", new File("6.png"));   
    }
}