个人学习参考所用，勿喷！ ?

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返回JSON

1) 用Maven构建web项目：

构建过程参考limingnihao的blog（写得相当的详细！！！）：使用Eclipse构建Maven的SpringMVC项目

注解@ResponseBody可以将结果（一个包含字符串和JavaBean的Map），转换成JSON。由于Spring是采用对JSON进行了封装的jackson来生成JSON和返回给客户端,所以这里需要添加jackson的相关包。项目的pom.xml配置如下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.watson</groupId>
	<artifactId>rest-spring</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>rest-spring Maven Webapp</name>
	<url>http://maven.apache.org</url>
	
	<dependencies>
		<!-- 省略其他配置,具体可以参考附件-->
		......
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
			<version>1.4.2</version>
		</dependency>
		<dependency>
			<groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
			<version>1.4.2</version>
		</dependency>
	</dependencies>
</project>

2) 在web.xml配置Spring的请求处理的Servlet，具体设置：

<?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"
	version="2.5">

	<display-name>Spring-Rest</display-name>
	<servlet>
		<servlet-name>rest</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/rest-servlet.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>rest</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

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3) 在rest-servlet.xml中配置如下：

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	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-3.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
 
	<context:component-scan base-package="com.mkyong.common.controller" />
	<mvc:annotation-driven />

</beans>

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?? 为了解决乱码问题，需要添加如下配置，并且这里可以显示的添加MappingJacksonHttpMessageConverter这个转换器。

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
	<property name="messageConverters">
		<list>
			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
				<property name="supportedMediaTypes">
					<list>
						<value>text/plain;charset=UTF-8</value>
					</list>
				</property>
			</bean>
			<bean class="org.springframework.http.converter.json.MappingJacksonHttpMe