&nbsp&nbsp&nbsp&nbsp&nbsp

3.用于检验输入的验证码是否正确：

package com;

import java.io.IOException;

import java.io.PrintWriter;

import javax.jms.Session;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class yanzheng extends HttpServlet {

public yanzheng() {

super();

}

public void destroy() {

super.destroy();

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request, response);

}

/*核心代码*/

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String info=null;

/*获取输入的值*/

String value1=request.getParameter("name");

/*获取图片的值*/

HttpSession session=request.getSessiohttp://n();

String value2=(String)session.getAttribute("checkcode");

/*对比两个值（字母不区分大小写）*/

if(value2.equalsIgnoreCase(value1)){

info="验证码输入正确";

}else{

info="验证码输入错误";brmMgYjg

}

System.out.println(info);

request.setAttribute("info", info);

request.getRequestDispatcher("/login.jsp" alt="java web验证码实现代码分享" title="java web验证码实现代码分享" width="200" height="150">