在 WEB-INF 目录下创建 jsp 目录,再创建两个 jsp 页面
login.jsp:
在 WEB-INF 目录下所有页面或资源,只能通过 controller,或是 servlet 进行访问
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<%-- 在 WEB-INF 目录下所有页面或资源,只能通过 controller,或是 servlet 进行访问 --%>
<h1>登录</h1>
<form action="${pageContext.request.contextPath}/user/login" method="post">
用户名:<input type="text" name="username"/>
密码:<input type="text" name="password"/>
<input type="submit" value="登录">
</form>
</body>
</html>
main.jsp 随便写点,比如首页
写个控制器,获取用户 Session 值
package com.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpSession;
@Controller
@RequestMapping("/user")
public class LoginController {
@RequestMapping("/main")
public String ma(){
return "main";
}
@RequestMapping("/go")
public String go(){
return "login";
}
@RequestMapping("/login")
public String login(HttpSession session,String username,String password){
//把用户信息存在 session 中
session.setAttribute("userLoginInfo",username);
return "main";
}
}
index.jsp:写两个链接
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<h1>
<a href="${pageContext.request.contextPath}/user/go">登录</a>
</h1>
<h1>
<a href="${pageContext.request.contextPath}/user/main">首页</a>
</h1>
</body>
</html>
如果想要未登录不准进首页的话,可以加拦截器
实现 HandlerInterceptor 拦截器接口
重写 preHandle() 方法
没有 SessionId,forward 转发去登录页
package com.demo.config;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class LoginInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
HttpSession session = request.getSession();
if(request.getRequestURI().contains("login")){
return true;
}
if(session.getAttribute("userLoginInfo")!=null){
return true;
}
request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request,response);
return false;
}
}
配置拦截器:
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/user/**"/>
<bean class="com.demo.config.LoginInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
记录一下遇到的 bug:
点击链接报了这个错,表示已经在 controller 包下的另一个类用了相同的地址,修改自己配置的地址即可