java使用BufferedImage和Graphics实现图片合成

package com.igoxin.weixin.custom;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class ComposeImageTest {

    /**
     * 图片合成
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        
        int i=1;
        int j=2;
        InputStream imagein = new FileInputStream(i + ".jpg");
        InputStream imagein2 = new FileInputStream(j + ".png");

        BufferedImage image = ImageIO.read(imagein);
        BufferedImage image2 = ImageIO.read(imagein2);
        Graphics g = image.getGraphics();
        g.drawImage(image2, image.getWidth() - image2.getWidth() - 15, image.getHeight() - image2.getHeight() - 10,
                image2.getWidth() + 10, image2.getHeight() + 5, null);
        OutputStream outImage = new FileOutputStream("custom" + j + "-" + i + ".jpg");
        JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(outImage);
        enc.encode(image);
        imagein.close();
        imagein2.close();
        outImage.close();

    }
}