1.下载spring相关jar

去哪里下载就不说了

要想支持json，需要下载?jackson-all-1.9.5.jar(版本看情况，下载合适的)

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2.配置web.xml

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<?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">

	<filter>
		<filter-name>sitemesh</filter-name>
		<filter-class>
			org.sitemesh.config.ConfigurableSiteMeshFilter
		</filter-class>
	</filter>

	<filter-mapping>
		<filter-name>sitemesh</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>


	<servlet>
		<servlet-name>Spring3</servlet-name>
		<servlet-class>
			org.springframework.web.servlet.DispatcherServlet
		</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/classes/spring/*.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>Spring3</servlet-name>
		<url-pattern>*.html</url-pattern>
	</servlet-mapping>
	<servlet-mapping>
		<servlet-name>Spring3</servlet-name>
		<url-pattern>*.action</url-pattern>
	</servlet-mapping>

	<!--编码过滤器-->
	<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>false</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

</web-app>

?应该都能看懂

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3.配置spring的配置文件

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<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	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/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
			http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
			http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
			http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
			http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd ">

	<!-- Spring要扫描的包 -->
	<context:component-scan base-package="com.mm" />
	
	<!-- 支持JSON 需要加入 jackson-all-1.9.5.jar  -->
	<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
		<property name="messageConverters">
			<util:list id="beanList">
				<ref bean="mappingJacksonHttpMessageCon