CheckCode

最新推荐文章于 2021-12-10 11:26:50 发布

云凌枫

最新推荐文章于 2021-12-10 11:26:50 发布

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分类专栏：登录验证

登录验证专栏收录该内容

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login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>验证码测试</title>

<script type="text/javascript">

/* 刷新验证码 */
function changeCheckCode()
{
document.getElementById("checkCode").src = "checkCode.jpg?" + new Date().getTime();
}

function checkLoginInfo()
{
if (form1.userName.value == "" || form1.userName.value == null)
{
alert("用户名不能为空");
form1.userName.focus();
return false;
}
else if (form1.userCode.value == "" || form1.userCode.value == null)
{
alert("验证码不能为空");
form1.yanzhengma.focus();
return false;
}

return true;
}
</script>


</head>

<body>
<center>
<form action="loginCheck" method="post" name="form1">
<br/><br/><br/><br/><br/><br/>


请输入用户名：<input type="text" name="userName" id="userName"/>

<br/><br/>

<img alt="点击刷新" src="checkCode.jpg" border="0" id="checkCode" onClick="changeCheckCode();" />
<br/>
请输入验证码：<input type="text" name="userCode" id="userCode"/>

<br/><br/>

<input type="submit" value="确认登录">

<br/><br/>


<font color="red">
${sessionScope.loginError } <%session.removeAttribute("loginError"); %>
</font>

</form>
</center>
</body>

</html>

Login.java

package edu.njnu.ncs.controller;

import java.io.IOException;

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

import org.apache.cxf.common.util.StringUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.wangxiang.util.CheckCode;

@Controller
public class Login {

@RequestMapping(value="loginCheck",method=RequestMethod.POST)
public String loginCheck(HttpServletRequest request, HttpServletResponse response) throws IOException{
response.setContentType("text/html;charset=UTF-8");

HttpSession session = request.getSession();

String userName = request.getParameter("userName"); // 账号
String userCode = request.getParameter("userCode"); // 输入的验证码

/* 获取系统生成的验证码，同时移除掉 */
String verificationCode = (String) session.getAttribute("checkCode");
session.removeAttribute("checkCode");

if (!userCode.equals(verificationCode))
{
session.setAttribute("loginError", "验证码错误");
return "login";
}
return "index";
}

@RequestMapping("checkCode.jpg")
public void createCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
// 通知浏览器不要缓存
response.setHeader("Expires", "-1");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "-1");
CheckCode util = CheckCode.Instance();
// 将验证码输入到session中，用来验证
String code = util.getString();
request.getSession().setAttribute("checkCode", code);
// 输出打web页面
ImageIO.write(util.getImage(), "jpg", response.getOutputStream());
}
}