SPRING MVC返回JSON数据

用到SPRING的 MappingJacksonJsonView 视图，需要jackson.jar包支持，下载地址http://wiki.fasterxml.com/JacksonDownload

一个测试的例子，配置控制器TestJsonController和视图解析器TestViewResolver：

<bean id="viewViewResolver" class="com.ll19.mvc.test.view.resolver.TestViewResolver"> 		<property name="order" value="1"/> 	</bean> 	<bean id="testJsonController" class="com.ll19.mvc.test.control.TestJsonController"> 		<property name="prefix" value="/json"/> 	</bean>

具体代码如下：

 
  package 
   com.ll19.mvc.test.control;   
 
  import 
   javax.servlet.http.HttpServletRequest;
  
  import 
   javax.servlet.http.HttpServletResponse;   
 
  import 
   org.springframework.web.servlet.ModelAndView;
  
  import 
   org.springframework.web.servlet.mvc.Controller;  
  
  import 
   com.ll19.mvc.test.bean.TestBean;   
 
  /** 
    * 测试控制器  *   *  
  @author 
   <a href=" 
  http://www.LL19.com/ 
  ">LL19.com</a>   
  */ 
   
 
  public 
    
  class 
   TestJsonController  
  implements 
   Controller {       
 
  /** 
        * 前缀       
  */ 
       

 
  private 
   String prefix;       
 
  public 
   String getPrefix() {         
 
  return 
   prefix;     }       
 
  public 
    
  void 
   setPrefix(String prefix) {         
 
  this 
  .prefix  
  = 
   prefix;     }       
 
  public 
   ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)  
  throws 
   Exception {           
TestBean testBean  
  = 
    
  new 
   TestBean();         
testBean.setDctime( 
  " 
  time 
  " 
  );         
testBean.setDid( 
  1L 
  );         
testBean.setDname( 
  " 
  jsonView测试 
  " 
  );         
ModelAndView mav  
  = 
    
  new 
   ModelAndView( 
  " 
  jsonView 
  " 
  );         
mav.addObject(testBean);           
 
  return 
   mav;     }   
} 
 

TestBean为一个测试BEAN，返回ModelAndView后视图解析器TestViewResolver直接返回MappingJacksonJsonView视图即可：

public View resolveViewName(String viewName, Locale locale) throws Exception { 		if (viewName.equals("jsonView")) { 			return new MappingJacksonJsonView(); 		} 		return null; 	}

MappingJacksonJsonView视图便会根据你添加的BEAN对象，自动转换为JSON格式，在例如使用AJAX获取数据后，即可直接用JS操作返回的JSON数据。

测试结果：{"testBean":{"did":1,"dname":"jsonView测试","dctime":"time"}}