chart2.jsp

一本jsp自学教材

<%@ page contentType="image/jpeg;charset=GBK" %>
<%@ page import="com.sun.image.codec.jpeg.*"%>
<%@ page import="java.awt.image.*"%>
<%@ page import="java.awt.*"%>
<%@ page import="java.io.*"%>
<%@ page import="javax.servlet.*"%>
<% 
   out.clear();
try{  
  //response.setContentType("");   

   
  ServletOutputStream ot=response.getOutputStream(); 
  FileInputStream in=new FileInputStream(new File("C:\\chart.jpg")); 
  JPEGImageDecoder jpgCodec = JPEGCodec.createJPEGDecoder(in); 
  BufferedImage image = jpgCodec.decodeAsBufferedImage(); 
  Graphics g = image.getGraphics(); 
  int x = image.getWidth()/2-10; 
  int y = image.getHeight()/2+5; 
  String random=Double.toString(Math.random()).substring(2,10); 
  //session.setAttribute("random",random); 
  g.setColor(Color.red); 
  g.drawString(random,x,y);   
  JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(ot); 
  encoder.encode(image);   
  in.close(); 

  ot.close(); 
  }catch(Exception e){   
  e.printStackTrace(); 
  }

%>