关于制作透明水印的问题，大家帮忙看看1

Question

我在这里找到一段代码，就是能改变尺寸，而且能加水印的，但我想把水印图片变透明一些，怎么实现
import java.io.File;
import java.io.FileOutputStream;
import java.awt.Image;
import java.awt.image.BufferedImage;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;/**
 * @author chaiwei
 * 生成缩略图类
 */
public class JPG {public static void thumbPic(String filename) {
try {
File file = new File(filename);
Image src = javax.imageio.ImageIO.read(file);
File file_sy = new File("D:\\test\\realone.gif");
Image src_sy = javax.imageio.ImageIO.read(file_sy);
int width=src.getWidth(null);
int height=src.getHeight(null);
int new_width = 0;
int new_height = 0;
if (width >= height) {
new_width = 600;
}
else{
new_width = 600;
}
new_height =((new_width * height) / width);
BufferedImage tag = new BufferedImage(new_width,new_height,BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(src,0,0,new_width,new_height,null);
tag.getGraphics().drawImage(src_sy,new_width-src_sy.getWidth(null),new_height-src_sy.getHeight(null),98,40,null);
FileOutputStream out=new FileOutputStream(filename + "_thumb.jpg");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); 
encoder.encode(tag);
out.close();
}
catch(Exception e) {
System.out.println(e);
}
}public static void main(String args[]) {
JPG.thumbPic("D:\\test\\sourse.jpg");
}}
也曾经自己改了一个方法，但不知道为什么不行，总是把图片给弄坏了 public static BufferedImage setOpacity( int opacity ,Image img) {  
      int width = img.getWidth( null);            
      int height = img.getHeight( null );            
      BufferedImage bi = new BufferedImage( width, height,BufferedImage.TYPE_INT_ARGB );            
      bi.getGraphics().drawImage( img, 0, 0, null );            
      WritableRaster pixels = bi.getAlphaRaster();            
      int[] o = new int[ width * height ];            
      for ( int i = 0; i < o.length; i++ ) {                
         o[i] = opacity;            
         }   
  System.out.println(pixels.getWidth());
      for ( int x = 0,m= pixels.getWidth(); x<m; x++ ) {                
         for ( int y = 0,n =pixels.getHeight();y<n ;y++ ){ 
            pixels.setPixel( x, y, o );                
            }            
         }            
      return bi;      
      }

Answer 1

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;public class Water
{
public static void main(String[] args) throws IOException
{
BufferedImage originImg = ImageIO.read(new File("E:/temp/splash.png"));
BufferedImage waterMarkImg = ImageIO.read(new File("E:/temp/1.png"));

addWater(originImg, waterMarkImg, 100, 100, 0.2f);

JFrame f = new JFrame();
f.getContentPane().add(new JLabel(new ImageIcon(originImg)), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
} private static void addWater(BufferedImage originImg, Image waterImg, 
int x, int y, float alpha) 
{
int waterWid = waterImg.getWidth(null);
int waterHei = waterImg.getHeight(null);
BufferedImage tempImg = new BufferedImage(waterWid, waterHei, 
BufferedImage.TYPE_INT_ARGB);

Graphics2D g2d = tempImg.createGraphics();
g2d.drawImage(waterImg, 0, 0, null);
g2d.setColor(new Color(1.0f, 1.0f, 1.0f, alpha));
g2d.setComposite(AlphaComposite.DstIn);
g2d.fillRect(0, 0, waterWid, waterHei);
g2d.dispose();

g2d = originImg.createGraphics();
g2d.drawImage(tempImg, x, y, null);
g2d.dispose();
}
}

Answer 2

问 gtlang78() ( ) 我如何把这两个合成的保存成另一个文件呀？？？？

Answer 3

gtlang78() 的方法试了可以哦，谢谢

Answer 4

ImageIO.write(bufferedImg, "jpg", new File("C:/test.jpg"));

Answer 5

///
ImageIO.write(bufferedImg, "jpg", new File("C:/test.jpg"));不行，保存不了