一个简单登录的SpringMVC的示例

一.框架图

二.步骤

1./WebRoot/WEB-INF/lib下添加SpringMVC必须的jar包;
下载地址：http://download.csdn.net/detail/decorator2015/9724399
2.在com.xml.models包中创建User类，该类包含两个属性：username和password，并分别实现这两个属性的setXxx（）和getXxx（）方法。

package com.xml.models;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;    }}

3.创建命令控制器类UserCommandController，该控制器要处理输入的username和password属性。在handle( )方法中command就是输入的一个对象，这里需要先转化为User类，并调用相应的方法获取User类中的username和password 属性值。然后放到一个List集合中，再调用getPage( )方法传回到指定的视图中。这个视图名在spring-servlet.xml文件中指定，该程序中指定为user。具体的代码如下：

package com.xml.models;import java.util.ArrayList;import java.util.List;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.validation.BindException;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractCommandController;public class UserCommandController extends AbstractCommandController {    private String page;    public UserCommandController(){        //设置命令对象类型        setCommandClass(User.class);    }    @Override    protected ModelAndView handle(HttpServletRequest request,            HttpServletResponse response, Object command, BindException errors)            throws Exception {        // TODO Auto-generated method stub        User user=(User)command;              //获取用户对象        String username=user.getUsername();   //获取用户名        String password=user.getPassword();   //获取密码        List list=new ArrayList();        list.add(0,username);        list.add(1,password);        return new ModelAndView(getPage(),"info",list);    }    public String getPage() {        return page;    }    public void setPage(String page) {        this.page = page;    }}

4.在WEB-INF/web.xml配置文件中配置DispatcherServlet，该应用将加载WEB-INF/spring-servlet.xml配置文件。具体的代码如下：

<?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">  <display-name>SpringMVCProject</display-name>   <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <!--配置DispatcherServlet    -->  <servlet>      <servlet-name>spring</servlet-name>      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>      <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>       <servlet-name>spring</servlet-name>       <url-pattern>*.do</url-pattern>  </servlet-mapping>  <!-- 配置分解应用上下文 -->  <listener>       <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>     <!-- context -->   <context-param>       <param-name>contextConfigLocation</param-name>       <param-value>           /WEB-INF/spring-servlet.xml       </param-value>   </context-param></web-app>

5.在WEB-INF/spring-servlet.xml配置文件，在该文件中配置控制器。向控制器UserCommandController注入了一个名称为page的属性，并配置该属性值为user。其具体的代码如下：

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC           "-//SPRING//dtd BEAN//EN"          "http://www.springframework.org/dtd/spring-beans.dtd"><beans>    <bean name="/user.do" class="com.xml.models.UserCommandController"><!-- 配置控制器 -->        <property name="page" value="user"/>    </bean>    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">         <property name="prefix" value="/"/>         <property name="suffix" value=".jsp"/>           </bean></beans>

6.在WebRoot目录下新建index.jsp文件，该文件的主要内容如下：

<%@ 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="user.do" method="post">        用户名：<input type="text" value="admin" name="username" />        密码：<input type="password" value="123" name="password"/>        <input type="submit" value="登录">    </form>  </body></html>

7.在WebRoot目录下新建user.jsp文件，在该文件中输入用户的用户名和密码，主要代码如下：

<%@ 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 'user.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>    <table cellpadding="0" cellspacing="0" border="0">        <tr>            <td width="60px" style="font-size:14px; font-weight:bold;">用户名</td>            <td>${info[0]}</td>        </tr>        <tr>            <td style="font-size:14px; font-weight:bold;">密码</td>            <td>${info[1]}</td>        </tr>    </table>  </body></html>

8.运行程序，请求index.jsp,输入用户名和密码，如下图（登录界面）

单击【登录】按钮，输出用户登录信息，如下图（输出用户登录信息）