servlet awt随机图片验证码（原始版本）

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package rd.test; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; //输出一张图片 public class Test1 extends HttpServlet {     public static final int WIDTH = 120;     public static final int HEIGHT = 35;           public void doGet(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {                   BufferedImage image = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);         Graphics g = image.getGraphics();                   //1,设置背景色         setBackGround(g);                   //2，设置边框         setBorder(g);                   //3，画干扰线         drowRandomLine(g);                   //4，写随机数         //drawRandomNum(g);         <strong>String</strong> random = drawRandomNum2d((Graphics2D)g);//验证相关 　　　　　　　　　　request.getSession().setAttribute("checkcode",random);//验证相关      <br>        //5,图形写给浏览器         response.setContentType("image/jpeg");         //控制浏览器不要缓存随机验证码图片，让它每次都更新         response.setDateHeader("expries", -1);         response.setHeader("Cache-Control","no-cache");         response.setHeader("Pragma","no-cache");         ImageIO.write(image, "jpg", response.getOutputStream());     }     private void drowRandomLine(Graphics g) {         // TODO Auto-generated method stub         g.setColor(Color.GRAY);                   for(int i = 0;i<5;i++) {             int x1 = new Random().nextInt(WIDTH-2)+2;             int y1 = new Random().nextInt(HEIGHT-2)+2;                           int x2 = new Random().nextInt(WIDTH-2)+2;             int y2 = new Random().nextInt(HEIGHT-2)+2;                           g.drawLine(x1, y1, x2, y2);         }     }     private <strong>String</strong> drawRandomNum2d(Graphics2D g) {         // TODO Auto-generated method stub         g.setColor(Color.RED);         g.setFont(new Font("宋体",Font.BOLD,20));         //[\u4e00-\u9fa5]               String base = "一二三四五六七八九十百千万兆亿啊我饿依无余"; 　　　　　　　　　　StringBuffer sb = new StringBuffer();//验证相关<br>       int x = 5;         for(int i = 0;i<4;i++) {             int degree = new Random().nextInt()%30;             String ch = "" + base.charAt(new Random().nextInt(base.length()));             sb.append(ch);//验证相关<br>　　　　　　　　　　　　　  g.rotate(degree*Math.PI/180, x, 25);//设置旋转幅度             g.drawString(ch, x, 25);             g.rotate(-degree*Math.PI/180, x, 25);//转回去             x+=30;         } <br>　　　　　　　　　　return sb.toString();     }     private void drawRandomNum(Graphics g) {         g.setColor(Color.RED);         g.setFont(new Font("宋体",Font.BOLD,20));         //[\u4e00-\u9fa5]               String base = "一二三四五六七八九十百千万兆亿啊我饿依无余";         int x = 5;         for(int i = 0;i<4;i++) {             String ch = "" + base.charAt(new Random().nextInt(base.length()));             g.drawString(ch, x, 20);             x+=30;         }               }     private void setBorder(Graphics g) {         g.setColor(Color.BLUE);         g.drawRect(1, 1, WIDTH-2, HEIGHT-2);               }     private void setBackGround(Graphics g) {         // TODO Auto-generated method stub         g.setColor(Color.WHITE);         g.fillRect(0, 0, WIDTH, HEIGHT);     }     public void doPost(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {     } }

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    
    <script type="text/javascript">
        function changeImg(img){
            img.src = img.src + "?" + new Date().getTime();
        }
    </script>
    
  </head>
  
  <body>
  
      <form action="/web/servlet/check" method="post">
          用户名:<input type="text" name="username">
          密码 :<input type="password" name="password"><br/><br/>
          验证码:<input type = "text" name="checkcode">
          <img src="http://localhost:8080/random/servlet/Test1" onclick="changeImg(this)"/>
          <input type="submit" value="注册">
      </form> 
  </body>
</html>

check:

request.setCharacterEncoding("UTF-8");

String c_checkcode = request.getParameter("checkcode");

String s_checkcode = request.getSession().getAttribut("checkcode");

if(c_checkcode!=null && s_checkcode!=null && c_checkcode.equals(s_checkcode)){

　　System.out.println("处理注册请求“);

}else{

　　System.out.println("验证码错误");

}