SpringMVC用户登录和拦截器简单应用增删改查

来源：互联网发布：梦里花落知多少解释编辑：程序博客网时间：2024/05/19 14:38

在学习SpringMVC和Spring整合的时候做了一个小练习，对员工进行报道（增）、修改、升迁、离职等操作，操作的时候用户必须实在登录状态下才能进行，这时候就用到了拦截器。

通过查阅资料，整理了一下，并简单进行了一下测试，当用户没有登录进行操作时，会自动跳转到login.jsp,也就是登录页面，部分程序如下：

自定义拦截器Login实现HandlerInterceptor接口，重写HandlerInterceptor接口的方法

package com.hygj.interceptor;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class Login implements HandlerInterceptor {private List<String> excludedUrls;public List<String> getExcludedUrls() {return excludedUrls;}public void setExcludedUrls(List<String> excludedUrls) {this.excludedUrls = excludedUrls;}public void afterCompletion(HttpServletRequest httpRequest,HttpServletResponse httpResponse, Object obj, Exception exc)throws Exception {// TODO Auto-generated method stub}public void postHandle(HttpServletRequest httpRequest, HttpServletResponse httpResponse,Object obj, ModelAndView arg3) throws Exception {// TODO Auto-generated method stub}public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object obj) throws Exception {//demo_13/emp/XXX 获取控制层方法String requestUri = request.getRequestURI();//遍历获取不做拦截的路径        for (String url : excludedUrls) {        //如果是以/checkLogin结尾的请求不做拦截处理            if (requestUri.endsWith(url)) {                return true;            }        }        HttpSession session = request.getSession();        //判断用户是否登录        if (session.getAttribute("userUid") == null) {        //如果没有登录，则跳转到login.jsp            response.sendRedirect(request.getContextPath() + "/login.jsp");        }               return true;}}

SpringMVC容器配置

<!--配置拦截器, 如果多个拦截器,则顺序执行 --><mvc:interceptors>      <mvc:interceptor>    <!-- 拦截器拦截的URL格式 ，如果不配置或/**,将拦截所有的Controller-->        <mvc:mapping path="/**" />        <!-- 处理拦截的具体实现类 -->        <bean class="com.hygj.interceptor.Login">        <!-- excludedUrls是要放行的url集合 -->        <property name="excludedUrls">        <list>        <value>/checkLogin</value>        </list>        </property>        </bean>    </mvc:interceptor>  </mvc:interceptors>

测试用户名为：admin，密码为1

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>login</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--><c:if test="${err == '1'}"><script type="text/javascript">alert("uid或pwd错误");</script></c:if>  </head>    <body>  <form method="post" action="${pageContext.request.contextPath}/emp/checkLogin">    uid:<input type="text" id="userUid" name="userUid" value="${userUid}"><br><br>    pwd:<input type="text" id="userPwd" name="userPwd"><br><br>    <input type="submit" value="Login">  </form>  </body></html>

控制层

checkLogin()判断用户名和密码，登录成功则跳转到showEmp.jsp

package com.hygj.controller;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import javax.annotation.Resource;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.beans.propertyeditors.CustomDateEditor;import org.springframework.stereotype.Controller;import org.springframework.web.HttpRequestHandler;import org.springframework.web.bind.WebDataBinder;import org.springframework.web.bind.annotation.InitBinder;import org.springframework.web.bind.annotation.RequestMapping;import com.hygj.pojo.Employee;import com.hygj.pojo.EmployeeHistroy;import com.hygj.pojo.Pager;import com.hygj.service.iface.IEmpService;@Controller@RequestMapping("/emp")public class EmpController {@Resource(name="empService")private IEmpService empService;public void setEmpService(IEmpService empService) {this.empService = empService;}@RequestMapping("/checkLogin")public String checkLogin(HttpServletRequest request){String userUid = request.getParameter("userUid");String userPwd = request.getParameter("userPwd");if("admin".equals(userUid) && "1".equals(userPwd)){HttpSession session = request.getSession();session.setAttribute("userUid", userUid);return "redirect:showEmp";}else{request.setAttribute("err", 1);return "login";}}@RequestMapping("/show")public String showEmp(HttpServletRequest request){//省略return "showEmp";}}

showEmp.jsp，因为省略了数据库操作，showEmp.jsp只显示succ表示登录成功

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>showEmp</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  succ  </body></html>

全部源码下载：http://download.csdn.net/download/users0001/10123920

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