java多张图片重叠。包括透明图片

package com.paic.activities.biz; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import javax.swing.ImageIcon; import org.junit.Test; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageDecoder; import com.sun.image.codec.jpeg.JPEGImageEncoder; public class test1 { @Test public void test() throws Exception { System.out.println("start.................."); InputStream is=new FileInputStream("d:/image/c.jpg"); //通过JPEG搞JPEG数据流解码器 JPEGImageDecoder jpegDecoder=JPEGCodec.createJPEGDecoder(is); //解码当前数据流，返回BufferedImage对像 BufferedImage buffImage=jpegDecoder.decodeAsBufferedImage(); //搞到Graphics对像,用于在BufferedImage对像绘制图和文字 Graphics g=buffImage.getGraphics(); //搞ImageIcon a.gif作为水印图片 ImageIcon imgIcon=new ImageIcon("d:/image/d.jpg"); //改变图片大小 imgIcon.setImage(imgIcon.getImage().getScaledInstance(120,120,Image.SCALE_DEFAULT)); ImageIcon imgIcon2=new ImageIcon("d:/image/g.jpg"); //得到image Image img=imgIcon.getImage(); Image img2=imgIcon2.getImage(); //水印绘制到图片上7 g.drawImage(img,160,180,null); g.drawImage(img2,150,150,null); g.setColor(Color.red); g.dispose(); //输出 OutputStream out=new FileOutputStream("d:/a1.jpg"); //创建jpeg图像编码器，用于编码内存中的图像数据到JPEG数据输出流 JPEGImageEncoder jpegEndcoder=JPEGCodec.createJPEGEncoder(out); //编码BufferedImage对像到JPEG数据输出流 jpegEndcoder.encode(buffImage); is.close(); out.close(); System.out.println("end..............."); } }