struts2和json集成编码问题
小菜学struts2   ,据说编码格式必须为 <constant   name= "struts.i18n.encoding "   value= "UTF-8 ">  </constant>  
 但是我写的程序,如果是gbk,可以运行json   ,但是如果是utf-8   ,则没反应,奇怪了 
 配置文件 
 	 <constant   name= "struts.custom.i18n.resources "   value= "messageResource ">  </constant>  
 	 <!--   定义web应用的默认编码集   -->  
 	 <constant   name= "struts.i18n.encoding "   value= "UTF-8 ">  </constant>  
 	 <!--   定义可以动态method模式进行Action访问   -->  
 	 <constant   name= "struts.enable.DynamicMethodInvocation "   value= "true ">  </constant>  
 	 <constant   name= "struts.ui.theme "   value= "simple "   />     
 	 <constant   name= "struts.ui.templateDir "   value= "template "   />     
 	 <constant   name= "struts.ui.templateSuffix "   value= "ftl "   />     
 	 <constant   name= "struts.locale "   value= "zh_CN ">  </constant>    
  <!--   使用ajaxaction处理类的跳转结果   -->  
 		 <action   name= "validName "   class= "com.hbxyf.action.UserAjaxAction ">  
 			 <result   type= "json "   />  
 			 <interceptor-ref   name= "defaultStack "   />  
 		 </action>      
  <%@   page   language= "java "   import= "java.util.* "   pageEncoding= "utf-8 "%>  
  <%@taglib   prefix= "s "   uri= "/struts-tags "%>  
  <% 
 String   path   =   request.getContextPath(); 
 String   basePath   =   request.getScheme()+ ":// "+request.getServerName()+ ": "+request.getServerPort()+path+ "/ "; 
 %>    
  <!DOCTYPE   HTML   PUBLIC    "-//W3C//DTD   HTML   4.01   Transitional//EN ">  
  <html>  
        <head>  
              <base   href= " <%=basePath%>  ">                
              <title> 用户添加 </title>                
 	 <meta   http-equiv= "pragma "   content= "no-cache ">  
 	 <meta   http-equiv= "cache-control "   content= "no-cache ">  
 	 <meta   http-equiv= "expires "   content= "0 ">              
 	 <meta   http-equiv= "keywords "   content= "keyword1,keyword2,keyword3 ">  
 	 <meta   http-equiv= "description "   content= "This   is   my   page ">  
 	 <LINK   rel= "stylesheet "   type= "text/css "   href= "navigation/stylee.css ">  
 	 <script   src= "sxhtml/prototype-1.4.0.js "   type= "text/javascript ">  </script>  
 	 <script   src= "sxhtml/json.js "   type= "text/javascript ">  </script>  
 		 <script   language= "JavaScript ">  
 			function   validateName() 
 			{ 
 				document.getElementById( "tip ").innerHTML   = " "; 
 				if(document.getElementById( "login ").value== " "){ 
 					return   ; 
 				} 
 				//请求的地址 
 				var   url   =