extjs跟Spring mvc3中的数据交互

extjs跟Spring mvc3中的数据交互,依然用的是JSON,步骤如下

1) 注册SPRING MVC3中的JSON解析器
   <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">       
<property name="messageConverters">
       <list>
          <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
       </list>
  </property>       
</bean>
  注意把jackson-json jar包放到LIB下

2)前端:
   Ext.Ajax.request({
  url : 'doSomething.htm',
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },                       
  params : { "test" : "testParam" },
  jsonData: {
                   "username" : "admin",
                    "emailId" : "[email protected]"
                 },
  success: function (response) {
                      var jsonResp = Ext.util.JSON.decode(response.responseText);
                      Ext.Msg.alert("Info","UserName from Server : "+jsonResp.username);
              },
  failure: function (response) {
                  var jsonResp = Ext.util.JSON.decode(response.responseText);
                  Ext.Msg.alert("Error",jsonResp.error);
            }
});

3) 后端
  @Controller
public class DataController
{
    @RequestMapping(value = "/doSomething", method = RequestMethod.POST)
    @ResponseBody
    public User handle(@RequestBody User user) throws IOException
    {
        System.out.println("Username From Client : "+user.getUsername());
        System.out.println("EmailId from Client : "+user.getEmailId());
        user.setUsername("SivaPrasadReddy");
        user.setEmailId("[email protected]");       
        return user;
    }
}