springmVc action返回json

转自：http://blog.csdn.net/chenlu123456789/article/details/9719705
1、添加jackson-all-1.6.4.jar包

2、在applicationContext.xml配制文件中添加如下代码

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
  <property name="messageConverters">
   <list >
    <ref bean="mappingJacksonHttpMessageConverter" />
   </list>
  </property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
  class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
  <property name="supportedMediaTypes">
   <list>
    <value>text/html;charset=UTF-8</value>
   </list>
  </property>
</bean>

3、在controller中添加如下代码

@RequestMapping(value="/chinese/listTree", method = RequestMethod.POST)
public @ResponseBody List getlistChinese(Model model){
  List<User> list = (List<ChineseCategory>) commonMgr.find("from User");
    return list;
}

返回值可以为list也可以为Map类型