Spring MVC的@ResponseBody返回JSON串

Xml代码 
<bean class ="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >  
    <property name="messageConverters">  
  <list>  
   <ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 -->  
  </list>  
</property>  
</bean>      
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />  

<bean class ="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" > 
    <property name="messageConverters"> 
  <list> 
   <ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 --> 
  </list> 
</property> 
</bean>   
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" /> 

需要以下两个jar包： 

Xml代码 
<dependency org="org.codehaus.jackson" name="jackson-core-asl" rev="1.5.5" conf="runtime->default" />  
<dependency org="org.codehaus.jackson" name="jackson-mapper-asl" rev="1.5.5" conf="runtime->default" />  

<dependency org="org.codehaus.jackson" name="jackson-core-asl" rev="1.5.5" conf="runtime->default" /> 
<dependency org="org.codehaus.jackson" name="jackson-mapper-asl" rev="1.5.5" conf="runtime->default" /> 



Java代码 
@RequestMapping(value="/nogood", method=RequestMethod.GET)   
public @ResponseBody CmUser execute(String userid) {   
  CmUser u = new CmUser();   
  u.setAge(16);   
  u.setName("测试用户");   
  return u;   
}