实验七 Spring MVC 应用
实验七 Spring MVC 应用
实验内容
1、使用 Spring MVC 框架实现用户登录功能，登录成功后显示当前用户的信息；如果登录失败则显示登录失败的页面。
2、使用 Spring MVC 的数据绑定将输入的用户名和密码封装成一个类在服务端进行处理。
3、使用拦截器实现只有登录成功的用户才能访问某些特定的页面，如果非登录成功则提示相应的错误信息。
实现界面：
目录：
UserController.java
package controller;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import po.User;
@Controller
public class UserController {@RequestMapping(value = "/login", method = RequestMethod.GET)public String toLogin() {return "login";}@RequestMapping(value = "/login", method = RequestMethod.POST)public String login(User user, Model model, HttpSession session) {String username = user.getUsername();String password = user.getPassword();if (username != null && username.equals("lisi") && password != null && password.equals("123456")) {session.setAttribute("USER_SESSION", user);return "redirect:main";}return "failure";}@RequestMapping(value = "/main")public String toMain() {return "main";}@RequestMapping(value = "/logout")public String logout(HttpSession session) {session.invalidate();return "redirect:login";}
}LoginInterceptor.java
package interceptor;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
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;import po.User;public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {// TODO Auto-generated method stubString url = request.getRequestURI();
// if (url.indexOf("/login") >= 0) {if (url.toLowerCase().endsWith("/login")) {return true;}HttpSession session = request.getSession();User user=null;user = (User) session.getAttribute("USER_SESSION");if (user != null) {return true;}request.setAttribute("msg", "您还有没有登录，请先登录");RequestDispatcher rDispatcher=request.getRequestDispatcher("WEB-INF/jsp/login.jsp");try {rDispatcher.forward(request, response);} catch (ServletException | IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return false;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,ModelAndView modelAndView) {// TODO Auto-generated method stub}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,Exception ex) {// TODO Auto-generated method stub}
}User.java
package po;public class User {private Integer id;private String username;private String password;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}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;}}failure.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
登陆失败<br>
<a href="login">重新登陆</a></body>
</html>
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" isELIgnored="false"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户登录</title>
</head>
<body>
${msg}
<form action="${pageContext.request.contextPath}/login"method="post">用户名<input type="text" name="username" /><br> 密码<input type="password" name="password" /><br><input type="submit" value="登录"/></form>
</body>
</html>
main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" isELIgnored="false"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
欢迎:${USER_SESSION.username}
<a href="${pageContext.request.contextPath}/logout">退出</a>
</body>
</html>
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" isELIgnored="false"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
欢迎:${USER_SESSION.username}
<a href="${pageContext.request.contextPath}/logout">退出</a>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"><display-name>ch9</display-name><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><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping><filter><filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name><url-pattern>/*
springmvc-servlet.xml
<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd"><context:component-scanbase-package="controller"></context:component-scan><mvc:interceptors><mvc:interceptor><!-- 拦截所有请求 --><mvc:mapping path="/**" /><bean class="interceptor.LoginInterceptor"></bean></mvc:interceptor></mvc:interceptors><bean id="viewResolver"class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/" /><property name="suffix" value=".jsp" /></bean>
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