jsp写的验证码

第一步：建立一个code.jsp的页面，产生随机码
   <%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"
     import="java.io.*,
          java.util.*,
          com.sun.image.codec.jpeg.*,
          java.awt.*,
          java.awt.image.*"%>
<%
  String s = "";
        int intCount = 0;
        /**
      * 验证码宽度
      */
      int width=100;
     /**
      * 验证码高度
      */
      int height=25;
        /**
      * 验证码字符集
      */
      char[] code=new char[]{
      'A','B','C','D','E','F','G','H','I','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z',
      'a','b','c','d','e','f','g','h','i','j','k','l','m','n','p','q','r','s','t','u','v','w','x','y','z',
       '2','3','4','5','6','7','8','9','开','绝','天','地','我','家','吮','光','爱','乐','笑','堂','小','昂'};
    
        /**
         *  创建一个随机数生成器类
         */
        Random random = new Random(); 
      
       // 随机产生codeCount数字的验证码。  
        for (int i = 0; i < 4; i++) {&nbs