一. 思路
- controller实现核对用户名和密码,如果核对正确则保存到session中并且跳转到主页
- 系统中包含诸多界面,部分界面不需要登录即可进行访问,通过拦截器实现判断是否是不需要登录的界面和用户是否登录(通过session),如果登录或者是不需要登陆的见面,则不进行拦截,如果不满足上述条件,则跳转到登录页面,拦截器返回false
二. 案例
1.导入jar包
commons-logging-1.1.1.jar jackson-annotations-2.5.4.jar jackson-core-2.5.4.jar jackson-databind-2.5.4.jar spring-aop-4.1.6.RELEASE.jar spring-beans-4.1.6.RELEASE.jar spring-context-4.1.6.RELEASE.jar spring-core-4.1.6.RELEASE.jar spring-expression-4.1.6.RELEASE.jar spring-tx-4.1.6.RELEASE.jar spring-web-4.1.6.RELEASE.jar spring-webmvc-4.1.6.RELEASE.jar
如果使用上传文件功能,需要额外导入
commons-fileupload-1.2.2.jar commons-io-2.0.1.jar
2.配置web.xml文件
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>05springMVC_data_2</display-name> <!-- 过滤实现表单数据传输过程编码问题 --> <filter> <filter-name>encoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encoding</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <!--springMVC标配 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!—设置controller配置文件位置--> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> </web-app>
3.创建配置文件mvc.xml在目录src下
4.用户实体类User
package com.ahd.entity; public class User { private String username; private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "User [username=" + username + ", password=" + password + "]"; } }
5.创建controller类LoginController
package com.ahd.controller; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import com.ahd.entity.User; @Controller public class LoginController { @RequestMapping("/login") public String Login(User user,HttpSession session){ if(user.getUsername().equals("ahdg")&&user.getPassword().equals("111111")){ session.setAttribute("user", user); return "index.jsp"; } return "login.jsp"; } @RequestMapping("/add") //本方法为测试方法 public String add(User user,HttpSession session){ System.out.println("add"); return "index.jsp"; } }
6.创建拦截器类LoginController
package com.ahd.interceptor; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class LoginInterceptor implements HandlerInterceptor{ //设置不被拦截的页面 private List<String> allowedPass; @Override public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3) throws Exception { // TODO Auto-generated method stub } @Override public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3) throws Exception { // TODO Auto-generated method stub } @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception { // TODO Auto-generated method stub //获取url地址 String url=request.getRequestURI().toString(); //先判断session中是否有登录信息 Object user=request.getSession().getAttribute("user"); if(user!=null){ return true; } for(String temp:allowedPass){ if(url.endsWith(temp)){ return true; } } response.sendRedirect(request.getContextPath()+"/login.jsp"); return false; } public void setAllowedPass(List allowedPass) { this.allowedPass = allowedPass; } }
7.配置mvc.xml文件
<?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:p="http://www.springframework.org/schema/p" 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"> <!-- 配置handerAdapter 适配器 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/> <!-- 文件上传配置 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 设置编码格式 --> <property name="defaultEncoding" value="utf-8"></property> <!-- 设置文件大小 --> <property name="maxUploadSize" value="10485760000"></property> <!-- 设置缓冲区大小 --> <property name="maxInMemorySize" value="40960"></property> </bean> <mvc:interceptors> <mvc:interceptor> <mvc:mapping path="/**"/> <bean class="com.ahd.interceptor.LoginInterceptor"> <property name="allowedPass"> <list> <value>login.do</value> </list> </property> </bean> </mvc:interceptor> </mvc:interceptors> <!-- spring容器扫描指定包下的所有类，如果类上有注解 那么根据注解产生相应bean对象已经映射信息 --> <context:component-scan base-package="com.ahd.controller"/> </beans>
8.编写前端页面
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% 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>My JSP 'index.jsp' starting page</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> ${user}<br/> <a href="fileupload.jsp" >文件上传fileupload.jsp</a><br/> <a href="fileupload1.jsp" >文件批量上传fileupload.jsp</a><br/> <a href="login.jsp" >登录</a> </body> </html>
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% 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>My JSP 'login.jsp' starting page</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> <form action="login.do" method="post"> 用户名:<input type="text" name="username" /><br/> 密 码:<input type="password" name="password" /><br/> <input type="submit" value="submit" /><br/> </form> </body> </html>