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一、定義登錄控制器

目錄結(jié)構(gòu)

SpringMVC自定義攔截器登錄檢測(cè)功能的實(shí)現(xiàn)代碼

代碼：

1、創(chuàng)建TUser類

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、創(chuàng)建LoginController類

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","這里是登陸界面");
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","用戶名或密碼不正確！");
return "loginFail";//跳轉(zhuǎn)到loginFail.jsp
}
HttpSession httpSession=req.getSession(true);//存在session則使用，不存在則創(chuàng)建
httpSession.setAttribute("user",tUser);
model.addAttribute("msg","登錄成功");
return "success";//跳轉(zhuǎn)到success.jsp
}
@RequestMapping("/loginOut")
public String loginFail(HttpSession session,Model model){
model.addAttribute("msg","退出登錄");
session.removeAttribute("user");
return "login";
}
}

頁(yè)面代碼:

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">
用戶名：<input type="text" name="name"/><br/>
密碼：<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" >返回登錄界面</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" >退出登錄</a></h2>
</body>
</html>

二、自定義登錄攔截器

代碼：

1、創(chuàng)建LoginInterceptor類，作為攔截器類需實(shí)現(xiàn)HandlerInterceptor，并重寫里面的三個(gè)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：判斷什么情況下
//1、請(qǐng)求到登陸界面放行,首次登陸
if(request.getRequestURI().contains("login")||request.getRequestURI().contains("doLogin")){
return true;
}
//2、退出登錄可直接放行
if(request.getRequestURI().contains("loginOut")){
return true;
}
//3、通過(guò)登錄進(jìn)入放行
if(request.getSession().getAttribute("user")!=null){
return true;
}
//非法請(qǐng)求進(jìn)行攔截
//重定向到登錄頁(yè)面
response.sendRedirect(request.getContextPath()+"login");
//攔截
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攔截器測(cè)試： 1、正常登錄(正確密碼：admin)

SpringMVC自定義攔截器登錄檢測(cè)功能的實(shí)現(xiàn)代碼

1.1、點(diǎn)擊退出登錄

SpringMVC自定義攔截器登錄檢測(cè)功能的實(shí)現(xiàn)代碼

2、用戶名密碼錯(cuò)誤

SpringMVC自定義攔截器登錄檢測(cè)功能的實(shí)現(xiàn)代碼

2.1、點(diǎn)擊返回登錄界面

SpringMVC自定義攔截器登錄檢測(cè)功能的實(shí)現(xiàn)代碼

3、非法請(qǐng)求

SpringMVC自定義攔截器登錄檢測(cè)功能的實(shí)現(xiàn)代碼

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原文鏈接：https://blog.csdn.net/codeblank/article/details/119247408