使用JSP对图象进行轻松水印制作

<%@ page autoFlush="false" contentType="text/html;charset=gb2312" import="java.io.FileInputStream,java.io.FileOutputStream,java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%>
<%
out.clear();
response.addHeader("pragma","NO-cache");
response.addHeader("Cache-Control","no-cache");
response.addDateHeader("Expries",0);
String dir="C:\\tomcat\\ww\\image\\";
String FileName =dir+"Sunset.jpg";
String OutFileName =dir+"water\\Sunset.jpg";
FileInputStream sFile = new FileInputStream(FileName);
//创建一个FileInputStream对象从源图片获取数据流
Image src = javax.imageio.ImageIO.read(sFile);
//创建一个Image对象并以源图片数据流填充
int width = src.getWidth(null);
//得到源图宽
int height = src.getHeight(null);
//得到源图长
if (width>70&&height>30){
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//创建一个BufferedImage来作为图像操作容器
Graphics g = image.getGraphics();
//创建一个绘图环境来进行绘制图象
g.drawImage(src,0,0,width,height,null);
//将原图像数据流载入这个BufferedImage
g.setFont(new Font("Verdana",Font.PLAIN,18));
//设定文本字体
String rand = "WWW.CNCHINA.ORG";
g.setColor(Color.yellow);
//设定文本颜色
g.drawString(rand,width-200,height-10);
//向BufferedImage写入文本字符
g.dispose();
//使更改生效
FileOutputStream outi = new FileOutputStream(OutFileName);
//创建输出文件流
JPEGImageEncoder encodera = JPEGCodec.createJPEGEncoder(outi);
//创建JPEG编码对象
encodera.encode(image);
//对这个BufferedImage (image)进行JPEG编码
outi.close();
//关闭输出文件流
}
%>
<img src="image/Sunset.jpg">
<img src="image/water/Sunset.jpg">

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