Spring MVC

2019-11-15 00:34:19

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SPRing MVC

登录界面：

登录界面：  Spring 视图层_viewindex.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><form action="login.do" method="post">用户名：<input type=text name="username"/><br>密码：<input type=text name="password"/><br><input type=submit value="登录"/></form>  </body></html>error.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 'error.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=text name="password"/><br><input type=submit value="登录"/></form>      登录失败  , <%=request.getAttribute("msg") %>  </body></html>success.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 'success.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> 恭喜：<%=request.getAttribute("username") %>,登录成功  </body></html>Spring 控制层_controlLoginController.javapackage com.spring.controller;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;import com.spring.model.UserInfoBean;public class LoginController implements Controller {private String successPage;private String errorPage;//private UserInfoBean userInfoBean;public String getSuccessPage() {return successPage;}public void setSuccessPage(String successPage) {this.successPage = successPage;}public void setErrorPage(String errorPage) {this.errorPage = errorPage;}private String getErrorPage() {return errorPage;}public ModelAndView handleRequest(HttpServletRequest request,HttpServletResponse response) throws Exception {  String username=request.getParameter("username");  String password=request.getParameter("password");  String message=null;  if(username==null||password==null||username.trim().equals("")||password.trim().equals(""))  {  message=" 用户名或者密码为空";  Map<String,String> model=new HashMap<String,String>();  model.put("msg", message);    return new ModelAndView(getErrorPage(),model); }if(!UserInfoBean.exisitUser(username)){message=username+"不存在"; Map<String,String> model=new HashMap<String,String>();  model.put("msg", message);    return new ModelAndView(getErrorPage(),model);}if(!UserInfoBean.confirmPassword(username,password)){message=username+"密码不正确";Map<String,String> model=new HashMap<String,String>();  model.put("msg", message);    return new ModelAndView(getErrorPage(),model);}else{Map<String, String> model=new HashMap<String,String>();model.put("username",username);return new ModelAndView(getSuccessPage(),model);}}}Spring 模型层_modelUserInfoBean.javapackage com.spring.model;import java.util.HashMap;import java.util.Map;public class UserInfoBean {private static Map<String,String>userinfo=new HashMap<String,String>();static{String numberOneUser="zhangsan";String numberOnePassword="123";String numberTwoUser="lisi";String numberTwoPassword="456";userinfo.put(numberTwoUser, numberTwoPassword);userinfo.put(numberOneUser, numberOnePassword);}//判断一个用户名是否存在public static boolean exisitUser(String username){return userinfo.containsKey(username);}public static boolean confirmPassword(String username,String password){return userinfo.get(username).equals(password);}}Spring 配置文件：Web.xml<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">这里配置spring 的后台servlet<servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>指定spring配置文件的路径<init-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/classes/applicationContext.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet>拦截所有以.do结尾的请求，可以修改<servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping>  <display-name></display-name>  <welcome-file-list>    <welcome-file>login.jsp</welcome-file>  </welcome-file-list></web-app>applicationContext.xml<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"><bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"><property name="mappings"><props><prop key="login.do">login</prop></props></property></bean><bean id="login" class="com.spring.controller.LoginController"><property name="errorPage"><value>error.jsp</value></property><property name="successPage"><value>success.jsp</value></property><!--  <property name="userInfoBean" ref="userInfoBean"></property>--></bean><!--  <bean id="UserInfoBean" class="com.spring.model.UserInfoBean"> </bean>--></beans>