package com.hygj.sunqi.j2ee.servlet;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;import java.awt.image.*;import java.awt.*;public class ModeJpeg extends HttpServlet {  private static final String CONTENT_TYPE = "text/html; charset=GBK";  private HttpSession session = null;  private String[] num = new String[4];  //Initialize global variables  public void init() throws ServletException {  }  //Process the HTTP Get request  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    //response.setContentType("image/jpeg");    response.setHeader("cache-control","no-cache");    response.setHeader("content-type","image/jpeg");    java.awt.image.BufferedImage bim = new java.awt.image.BufferedImage(60,20,BufferedImage.TYPE_INT_RGB);    Graphics g = bim.getGraphics();    g.setColor(Color.orange);    g.fillRect(0,0,60,20);    g.setFont(new Font("黑體",Font.BOLD,16));    for(int i = 0;i < 4;i++){      int rand = (int)(Math.random()*10);      g.setColor(Color.blue);      g.drawString((num[i]=String.valueOf(rand)),13*i+6,16);    }    session = request.getSession();    session.setAttribute("checkMode",num);    g.dispose();    OutputStream out = response.getOutputStream();    javax.imageio.ImageIO.write(bim,"JPEG",out);  }  //Process the HTTP Post request  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    doGet(request, response);  }  //Clean up resources  public void destroy() {  }}