Struts2返回XML，JSON格式

Struts2返回XML，JSON格式

Struts2返回XML格式  
1.struts.xml里面的配置package extends="struts-default"  

 <action name="actionName"  class ="bookTypeAction"  method="methodName"  >
         <result name="xmlMessage"  type="plaintext" ></result>
 </action>

2.Action里面的方法  

 public  void  xxxMethod() throws  IOException{
      HttpServletResponse response = ServletActionContext.getResponse();
      PrintWriter out = response.getWriter();
      response.setContentType("application/xml;charset=UTF-8" );
      out.write("XML文档" );
 }

Struts2返回Json格式  
1.下载jsonplugin-0.7.jar包  
如果用JSONObject把Object转成JSON字符串的话需要下载下面的包  
   commons-beanutils-1.7.0.jar  
   json-lib-2.2.1-jdk15.jar  
   ezmorph-1.0.4.jar  
2.Action里面的方法  
   

 HttpServletRequest request =ServletActionContext.getRequest();
 HttpServletResponse response = ServletActionContext.getResponse();

 int  bookTypeId = Integer.parseInt(request.getParameter("bookTypeId" ));
 int  num = admimService.getDeleteBookTypeCond(bookTypeId);
 response.setContentType(ContentType_JSON);
 if (num == 0 ){
   boolean  isSuccess = true ;
   int  x = admimService.deleteBookType(bookTypeId);
   //这是产生简单的json的方法
   response.getWriter().write("{success:" +isSuccess+",num:" +num+"}" );
 }else {
  response.getWriter().write("{success:false,num:" +num+"}" );
 }

如果要把一个对象的实例转成json,建议用JSONObject,  
如：  

 import  net.sf.json.JSONArray;
 import  net.sf.json.JSONObject;

 ...
 ...
 ...
 /**
  * 通过bean生成JSON数据
  * @param bean bean对象
  * @return 生成的JSON数据
 */
 public  static  String getJsonFromBean(Object bean){
  try {
       JSONObject JsonObject = JSONObject.fromObject(bean);
       return  JsonObject.toString();
  }catch (Exception e){
    e.printStackTrace();
  }
  return  null ;
 }