img.java

我自己写的javabean+jsp+servlet

package com.gke;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Img extends HttpServlet{
	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
		response.setContentType("image/jpeg");
		response.setHeader("pragma","No-cache");
		response.setHeader("Cache-Control","No-cache");
		response.setDateHeader("Expires",0);
		
		OutputStream out = response.getOutputStream();
		int width=80,height=20;
		
		String myrand;
		
		BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
		
		Graphics g = image.getGraphics();
		
		Random random = new Random();
		
		g.fillRect(0,0,width,height);
		
		g.setFont(new Font("Time New Roman",Font.ITALIC,18));
		String sRand = "";
		for(int i = 0;i<4;i++){
			String rand = String.valueOf(random.nextInt(10));
			sRand+=rand;
			g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
			
			g.drawString(rand,20*i+6,16);
			
		}
		
		
		HttpSession session = request.getSession();
		if(session!=null){
			session.setAttribute("myrand", sRand);
		}
		
		g.dispose();
		
		ImageIO.write(image,"JPEG",out);
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{
		doGet(request,response);
	}
}