json文本传输

Java代码：
returnMes = "hello";
this.writeJson(returnCode, response);
Struts.xml:
<action name="deleteList" class="userAction" method="deleteList">
 <result name="json"/>
</action>

js：

 $.ajax({
         type:"post",
         url:$("#delAction").val(),
         data:"userIdStrs=" + userIdList.toString()+"&pageNum="+pageno,
         dataType:"text",
         beforeSend: function()
         {
         },
         success: function(json)
         {
             popDialog.show("提示信息", json);
         },
         error: function()
         {
          $("div.mask").hide();
       $("div.diag02").hide();
          popDialog.show("提示信息", "删除失败");
         }
     });

其余代码同json数据传输