JSP java 给图片加水印

Blex 2011-05-18

展开全文

WaterMark.java 代码如下

/*
* Created on 2005-3-29
*
* TODO 实现图片的水印效果，只针对jpg
*/
package com.tryitsoft.image;

import java.awt.*;
import java.awt.image.*;
import java.io.*;
import javax.swing.*;
import com.sun.image.codec.jpeg.*;

public class WaterMark {
/**
   * 给图片添加水印
   * @param filePath 需要添加水印的图片的路径
   * @param markContent 水印的文字
   * @param markContentColor 水印文字的颜色
   * @param qualNum 图片质量
   * @return
   */
public boolean createMark(String filePath,String markContent,Color markContentColor,float qualNum)
{
      ImageIcon imgIcon=new ImageIcon(filePath);
      Image theImg =imgIcon.getImage();
      int width=theImg.getWidth(null);
      int height= theImg.getHeight(null);
      BufferedImage bimage = new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
      Graphics2D g=bimage.createGraphics();
      g.setColor(markContentColor);
      g.setBackground(Color.white);
      g.drawImage(theImg, 0, 0, null );
      g.drawString(markContent,width/5,height/5); //添加水印的文字和设置水印文字出现的内容
      g.dispose();
      try{
      FileOutputStream out=new FileOutputStream(filePath);
      JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(out);
      JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bimage);
      param.setQuality(qualNum, true);
      encoder.encode(bimage, param);
      out.close();
      }catch(Exception e)
      { return false; }
      return true;
}
}

jsp调用文件 tt.jsp

<%@ page language="java" pageEncoding="GBK" %>
<%@ page import="java.awt.*" %>
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>Lomboz JSP</title>
</head>
<body bgcolor="#FFFFFF">

<%com.tryitsoft.image.WaterMark wm = new com.tryitsoft.image.WaterMark();

if (wm.createMark("d://map.jpg","http://www.",Color.ORANGE,70f))
{
out.print("添加水印成功！");
}
else
{
out.print("添加水印失败！");
}
%>
</body>
</html>