springMVC学习+登陆小实例讲解

      之前在学习SpringMVC的过程中，写了一个springMVC的实例，今天终于有时间把这个例子传上来。这个例子就是做了登陆这个最最简单的功能，使用springMVC尽可能简单的配置来实现的。下面是这个SpringMVC的目录结构，源码可以下载SpringMVC实例。

 首先要对项目的web.xml进行配置，这个项目的web.xml的内容如下

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>springMVC1</display-name>
  
  <welcome-file-list>
    <welcome-file>view/login.jsp</welcome-file>
  </welcome-file-list>
  
  <context-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>
  				classpath:/config/spring/Context.xml
  				classpath:/config/spring/springDao.xml
  		</param-value>
  </context-param>
  
  <context-param>                       
		<param-name>log4jConfigLocation</param-name> 
		<param-value>/WEB-INF/config/log4j.xml</param-value>  
  </context-param>
  
  <listener>
  	 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <servlet>
  	<servlet-name>springMVC</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  		<init-param>
  			<param-name>contextConfigLocation</param-name>
  			<param-value>/WEB-INF/config/spring-mvc.xml</param-value>
  		</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>springMVC</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>
  
  <filter>
	<filter-name>encodingFilter</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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
  </filter>
  <filter-mapping>
	  <filter-name>encodingFilter</filter-name>
	  <url-pattern>/</url-pattern>
  </filter-mapping>
  
  <filter>
  		<filter-name>openSession</filter-name>
  		<filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>openSession</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
</web-app>

具体的解释可以参照 点击这里。

       在完成web.xml的配置后，根据web.xml中的需要的配置文件分别对context.xml(数据库相关的配置)、log4j.xml(日志文件的配置，具体配置解释可以点击这里)、spring-mvc.xml以及springDao.xml的配置。

      其中spring-mvc.xml的配置内容是最基本的springMVC的配置，其内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"  
 xmlns:context="http://www.springframework.org/schema/context"  
 xmlns:p="http://www.springframework.org/schema/p"  
 xmlns:mvc="http://www.springframework.org/schema/mvc"  
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
 xsi:schemaLocation="http://www.springframework.org/schema/beans  
      http://www.springframework.org/schema/beans/spring-beans-3.0.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-3.0.xsd">
         <!-- 注解扫描包 -->
	<context:component-scan base-package="com.spri.controller" />
	
	<!-- 开启注解 -->	
	<mvc:annotation-driven/>

	<!-- 静态资源访问 -->
	 <mvc:resources location="/img/" mapping="/img/**"/>  
	 <mvc:resources location="/js/" mapping="/js/**"/>   
	
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<mvc:view-controller path="/" view-name="redirect:/user/welcome" />
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		  <property name="defaultEncoding" value="utf-8" />
	      <property name="maxUploadSize" value="10485760000" />
	      <property name="maxInMemorySize" value="40960" />
	</bean>
 </beans>  

         springDao.xml中配置了一些bean，在使用时通过set方法注入到相应的都相中去，下面是本文的基本的bean的配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd" [
<!ENTITY contextInclude SYSTEM "org/springframework/web/context/WEB-INF/contextInclude.xml">
]>

<beans>
	<bean id="userDao" class="com.spri.dao.impl.UserDaoImpl">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	
	<bean id="userSerciceImpl" class="com.spri.service.impl.UserServiceImpl">
		<property name="userDao" ref="userDao"></property>
	</bean>
	
	<bean id="userManager" parent="transactionBase">
		<property name="target" ref="userSerciceImpl"></property>
	</bean>
	
</beans>

       以上这四个配置文件配置完成后就可以进行前后台的编码工作了。后台分别由controller、dao及其实现、service及其实现以及entity，这些都完成了这个登陆流程中相对简单的实现。

       此例controller中没有对登陆密码进行验证，只是读取数据库中的用户名进行用户名的验证，在spring-mvc.xml中还对springmvc实例的项目登陆的首页进行了设置，contrler的内容如下：

package com.spri.controller;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.omg.IOP.ExceptionDetailMessage;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.spri.entity.User;
import com.spri.service.UserService;

@Controller
@RequestMapping("/user")
public class UserController {

	@Resource(name="userSerciceImpl")
	private UserService userSerciceImpl;
	  
	@RequestMapping("/welcome")
	public String login(){	
		return "/login";
	}
	
	@RequestMapping("/checkLogin")
	public String checkLogin(User luser, HttpServletRequest request ,HttpSession session){
		User user = userSerciceImpl.getUser(luser.getUserName());
		//User user = null;
		if(user!= null){
			session.setAttribute("user",user);
			request.setAttribute("user",user);
			return "WEB-INF/view/loginMain";
		}
		else{
			return "error";
		}
	}
	@RequestMapping("/loginSuccess")
	public String loginSuccess(){
		return "WEB-INF/view/loginMain";
	}
	

}

登陆首页：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<script  type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.9.1.js"></script>
<script  type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.validate.min.js"></script>
<script  type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.form.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户登陆</title>
<script type="text/javascript">
	function login(){
		var form = document.forms[0];
		form.action="/springMVC/user/checkLogin";
		form.method="post";
		form.submit();
	}
</script>
</head>
<body>
	<div id="logindlg" class="easyui-dialog" title="登陆"bstyle="width: 400px; height: 200px;">
		<br>
		<form id="loginform" method="post">
			<center>
				<table cellspacing="5px;">
					<tr align="left">
						<td>用户：</td>
						<td><input  type="text"  name="userName"/></td>
					</tr>
					<tr align="left">
						<td>密码：</td>
						<td><input type="password" name="passWord" /></td>
					</tr>
				</table>
				<br> <a href="#1"  onclick="login()">登陆</a>  
			    <a href="#2" onclick="user_register()">取消</a>
			</center>
		</form>
	</div>
</body>
</html>

登陆效果：

登陆成功后的效果：

由于本人也是在学习的过程中，可能有些地方写的不对，还麻烦大家指正……

资料：

springMVC快速入门指导：http://jeromejaglale.com/doc/spring4_tutorial/mvc_web_application

springMVC和模板，怎么使用模板访问数据：http://www.thymeleaf.org/doc/articles/springmvcaccessdata.html

什么是springMVC的Modelview：http://stackoverflow.com/questions/3423262/what-is-modelattribute-in-spring-mvc

springMVC中的表单和数据模型：http://bitbybitblog.com/forms-and-data-models-in-spring-mvc/

springMVC指导：http://www.mkyong.com/tutorials/spring-mvc-tutorials/