SpringMVC自定义拦截器登录检测功能的实现代码

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

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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" %>  login ${msg}
 用户名：
 密码：

2、loginFail.jsp

 <%@ page contentType="text/html;charset=UTF-8" language="java" %>  loginFail ${msg}
返回登录界面

3、success.jsp

 <%@ page contentType="text/html;charset=UTF-8" language="java" %>  success ${msg} 退出登录

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)

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