imagesign.java

一本jsp自学教材

package test;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.*;
import javax.imageio.ImageIO;

public class ImageSign extends HttpServlet {
    ServletConfig config=null;                          
    private String sign="";  //定义标记字符
    public void init(ServletConfig config)throws ServletException
     {
       super.init(config);      
       this.config=config;
        //获取自定义标记
       sign=config.getInitParameter("signature");
     }
    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {        
        response.setContentType("image/jpeg;charset=GBK");
        PrintWriter out = response.getWriter();
  String name=request.getParameter("name");
  name=new String(name.getBytes("ISO-8859-1"));  
  String ima=request.getParameter("image");  

  try{
  //获取当前文件路径
  String path=request.getRealPath("/");
  String fullpath=path+name+".jpg";
  //建成立文件输出流
  FileOutputStream ot = new FileOutputStream(fullpath);
 // ServletOutputStream ot=response.getOutputStream();
   //构造文件输入流 
  FileInputStream in=new FileInputStream(ima);   
  JPEGImageDecoder jpgCodec = JPEGCodec.createJPEGDecoder(in); 
  BufferedImage image = jpgCodec.decodeAsBufferedImage(); 
  //构造绘图对象
  Graphics g = image.getGraphics(); 
  g.setColor(Color.red); //设置绘图颜色
  //获取原图片宽和高
  int width=image.getWidth();
  int height=image.getHeight();
  Font ff=new Font("Monotype Corsiva",Font.PLAIN,20);
  g.setFont(ff);
  //定义标记字符
  //String signatur="[e-mail]";  
  //将字符绘入指定图片位置(右下角)
  g.drawString(sign,width-180,20); 

  JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(ot); 
  //重新进行JPEG编码
  encoder.encode(image);   
  in.close(); 
  ot.close(); 
  out.print("上传图片成功：<BR>");
  out.print("图片存储路径为："+path);
  out.print("<BR><IMG src=\""+name+".jpg\"/>");
}
catch(Exception e)
{
 out.print(e.toString());
}
    }  
    public void doPost(HttpServletRequest request,
                      HttpServletResponse response)
        throws IOException, ServletException
    {  
      doGet(request,response);    
    }   
   public void destroy()
    {
     config=null;
    }
}