SPRING MVC返回JSON數據

用到SPRING的 MappingJacksonJsonView 視圖，需要jackson.jar包支持，下載地址http://wiki.fasterxml.com/JacksonDownload

一個測試的例子，配置控制器TestJsonController和視圖解析器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>

具體代碼如下：

 
          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;   
 
          /** 
            * 測試控制器  *   *  
          @author 
           <a href=" 
          http://www.LL19.com/ 
          ">LL19.com</a>   
          */ 
           
 
          public 
            
          class 
           TestJsonController  
          implements 
           Controller {       
 
          /** 
                * 前綴       
          */ 
               

 
          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測試 
          " 
          );         
ModelAndView mav  
          = 
            
          new 
           ModelAndView( 
          " 
          jsonView 
          " 
          );         
mav.addObject(testBean);           
 
          return 
           mav;     }   
} 
         

TestBean為一個測試BEAN，返回ModelAndView后視圖解析器TestViewResolver直接返回MappingJacksonJsonView視圖即可：

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

MappingJacksonJsonView視圖便會根據你添加的BEAN對象，自動轉換為JSON格式，在例如使用AJAX獲取數據后，即可直接用JS操作返回的JSON數據。

測試結果：{"testBean":{"did":1,"dname":"jsonView測試","dctime":"time"}}