Controller层中代码：
@Controller public class LoginController { @RequestMapping("/login") public String login(String username, String password, HttpServletRequest request){ if("zhangsan".equals(username) && "123".equals(password)){ System.out.println("登录成功"); request.getSession().setAttribute("username",username); return "redirect:/account/findAll"; }else { System.out.println("登录失败"); return "redirect:/login.jsp"; } } }
Interceptor层中代码：
public class LoginInterceptor implements HandlerInterceptor { /** * 登录验证 * 如果session有登录信息，放行 * 如果session没有登录信息，拦截 * 判断是否是登录请求，如果登录请求，直接放行 */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //获取请求路径 String requestURI = request.getRequestURI(); //判断是否是登录请求 if(requestURI.contains("login")){ // 如果是登录请求，直接放行 return true; } //从session中获取登录信息 Object username = request.getSession().getAttribute("username"); if(username != null){ //session中有登录信息，放行 return true; }else{ //session没有登录信息，跳转到登录页面 response.sendRedirect("/login.jsp"); return false; } } }
<%@ page isELIgnored="false" contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<!-- 引入CSS样式 -->
<link rel="stylesheet" href="${pageContext.request.contextPath}/css/bootstrap.min.css">
</head>
<body>
<form class="form-horizontal" role="form" method="post" action="${pageContext.request.contextPath}/login">
<div class="form-group">
<label for="username" class="col-sm-2 control-label">用户名</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="username" name="username"
placeholder="请输入用户名">
</div>
</div>
<div class="form-group">
<label for="money" class="col-sm-2 control-label">密码</label>
<div class="col-sm-10">
<input type="password" class="form-control" id="money" name="password"
placeholder="请输入密码">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-default">登录</button>
</div>
</div></form>
</body>
<!-- 引入JS文件 -->
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.9.1.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/bootstrap.min.js"></script>
</html>
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!--扫描包，创建类对象--> <context:component-scan base-package="com.itheima.controller"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/pages/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--注解驱动--> <mvc:annotation-driven></mvc:annotation-driven> <!--拦截器--> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <!--如果拦截了静态资源，需要配置放行--> <mvc:exclude-mapping path="/js/*"></mvc:exclude-mapping> <mvc:exclude-mapping path="/css/*"></mvc:exclude-mapping> <mvc:exclude-mapping path="/fonts/*"></mvc:exclude-mapping> <bean class="com.itheima.interceptor.LoginInterceptor"></bean> </mvc:interceptor> </mvc:interceptors> <!--静态资源放行--> <!--<mvc:resources mapping="/js/*" location="/js/"></mvc:resources>--> <!--静态资源全部放行--> <mvc:default-servlet-handler></mvc:default-servlet-handler> </beans>