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
;
}