Java的WEB框架中，Struts2应该是最著名的，不过最近试了试Spring3 MVC，感觉好爽啊，几乎像ASP.Net MVC3一样舒服，以后就用它了。简单记录一下过程，没有技术含量。
1、准备包
下载的是spring framework 3.2.0，从中抽取以下jar到工程的WEB-INF/lib下：
spring-beans-3.2.0.RELEASE.jar
spring-context-3.2.0.RELEASE.jar
spring-core-3.2.0.RELEASE.jar
spring-expression-3.2.0.RELEASE.jar
spring-web-3.2.0.RELEASE.jar
spring-webmvc-3.2.0.RELEASE.jar
另外还需要几个第三方jar包，记录日志和处理json：
commons-logging-1.1.1.jar
jackson-core-als-1.9.11.jar
jackson-mapper-asl-1.9.11.jar
2、WEB-INF/web.xml
<?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">
<!--站点名-->
<display-name>mvc</display-name>
<!--指定spring配置文件-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<!--servlet名字，随意-->
<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名字-->
<servlet-name>spring</servlet-name>
<!--拦截所有请求，对静态文件会有问题，在spring-servlet.xml中解决-->
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3、WEB-INF/spring-servlet.xml
<?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">
<!-- 启动注解驱动的Spring MVC功能，注册请求url和注解POJO类方法的映射-->
<mvc:annotation-driven />
<!-- 启动包扫描功能，以便注册带有@Controller、@Service、@repository、@Component等注解的类成为spring的bean -->
<context:component-scan base-package="com.test.mvc.web" />
<!-- 对模型视图名称的解析，在WEB-INF/jsp目录下找对应的jsp文件 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />
<!--放过/scripts下的静态文件-->
<mvc:resources mapping="/scripts/**" location="/scripts/" />
</beans>
4、WEB-INF/applicationContext.xml
spring的配置文件，由于我们不使用它的其它功能，暂时放个空的就好了。
<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd">
</beans>
5、写Controller
package com.test.mvc.web;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.*;
/**
* 控制器，用Controller注解
*/
@Controller
public class HomeController {
/**
* 映射到/welcome
*/
@RequestMapping(value = "/welcome")
public ModelAndView welcome(){
