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SpringMVC用户登录和拦截器简单应用增删改查

2017-11-18 14:28 489 查看

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

login.jsp

<%@ 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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标签： spring mvc 拦截器存储过程

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