这篇文章主要介绍了SpringMVC自定义拦截器登录检测功能的实现,本文通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
一、定义登录控制器
目录结构
代码：
1、创建TUser类package com.demo.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class TUser {
private String name;
private String password;
}
2、创建LoginController类package com.demo.controller;
import com.demo.pojo.TUser;
import com.demo.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@Controller
@RequestMapping("/user")
public class LoginController {
@RequestMapping("/login")
public String login(Model model){
model.addAttribute("msg","这里是登陆界面");
return "login";
}
@RequestMapping("/doLogin")
public String doLogin(TUser tUser,
HttpServletRequest req, HttpServletResponse resp, Model model){
System.out.println("###LoginController.doLogin()");
if(!"admin".equals(tUser.getName())||!"admin".equals(tUser.getPassword())){
model.addAttribute("msg","用户名或密码不正确！");
return "loginFail";//跳转到loginFail.jsp
}
HttpSession httpSession=req.getSession(true);//存在session则使用，不存在则创建
httpSession.setAttribute("user",tUser);
model.addAttribute("msg","登录成功");
return "success";//跳转到success.jsp
}
@RequestMapping("/loginOut")
public String loginFail(HttpSession session,Model model){
model.addAttribute("msg","退出登录");
session.removeAttribute("user");
return "login";
}
}
页面代码:
1、login.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>login</title>
</head>
<body>
<h1>${msg}</h1>
<form id="login" action="${pageContext.request.contextPath}/user/doLogin" method="post">
用户名：<input type="text" name="name"/><br/>
密码：<input type="password" name="password"><br/>
<input type="submit">
</form>
</body>
</html>
2、loginFail.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>loginFail</title>
</head>
<body>
<h1>${msg}</h1>
<h2><a href="${pageContext.request.contextPath}/user/loginOut" rel="external nofollow" rel="external nofollow" >返回登录界面</a></h2>
</body>
</html>
3、success.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>success</title>
</head>
<body>
${msg}
<h2><a href="${pageContext.request.contextPath}/user/loginOut" rel="external nofollow" rel="external nofollow" >退出登录</a></h2>
</body>
</html>
二、自定义登录拦截器
代码：
1、创建LoginInterceptor类，作为拦截器类需实现HandlerInterceptor，并重写里面的三个方法preHandle、postHandle、afterCompletion：package com.demo.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
Object handler) throws Exception {
System.out.println("LoginInterceptor preHandle");
//放行：判断什么情况下
//1、请求到登陆界面放行,首次登陆
if(request.getRequestURI().contains("login")||request.getRequestURI().contains("doLogin")){
return true;
}
//2、退出登录可直接放行
if(request.getRequestURI().contains("loginOut")){
return true;
}
//3、通过登录进入 放行
if(request.getSession().getAttribute("user")!=null){
return true;
}
//非法请求进行拦截
//重定向到登录页面
response.sendRedirect(request.getContextPath()+"login");
//拦截
return false;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response,
Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("LoginInterceptor "+"postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
Object handler, Exception ex) throws Exception {
System.out.println("LoginInterceptor "+"afterCompletion");
}
}
2、在spring-mvc.xml中配置LoginInterceptor拦截器 测试： 1、正常登录(正确密码：admin)
1.1、点击退出登录
2、用户名密码错误
2.1、点击返回登录界面
3、非法请求
到此这篇关于SpringMVC自定义拦截器登录检测功能的实现的文章就介绍到这了,更多相关SpringMVC自定义拦截器内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持CodeAE代码之家！
原文链接：https://blog.csdn.net/codeblank/article/details/119247408
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编程语言
发布于：2021-09-12 13:20
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