ajax 跨域处理 jsonp

1. 
   前段页面      <script type="text/javascript">

     jQuery(document).ready(function(){ 
        $.ajax({
             type: "get",
             async: false,
             url: 'http://shanghai.51fmzg.com/findNoticeMessage.htm',
             dataType: "jsonp",
             jsonp: "callback",
             jsonpCallback:"flightHandler",
             success: function(json){
    $.each(json,function(idx,item){
$("div.notice ul").after("<li><div class='newtitle'>"+item.content+"</div><div class='time'>"+item.sendDate+"</div><div class='clear'></div></li>")

});
                 
             },
             error: function(){
                 alert('fail');
             }
         });
     });
     </script>

   服务端

   public ModelAndView findNoticeMessage(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
List noticeMessageList = messageManager.findNoticeMessage(0, 3);
Collections.reverse(noticeMessageList);
List jsonList=new ArrayList();
String message="[";
for (int i = 0; i < noticeMessageList.size(); i++) {
Map map=(Map)noticeMessageList.get(i);
if(i>0){
message=message+",";
}

String string =map.get("sendDate").toString();
 message+="{'content':'"+map.get("content").toString().trim()+"','sendDate':'"+map.get("sendDate").toString().substring(0,16)+"'}";
}
message+="]";
JSONArray ja = JSONArray.fromObject(noticeMessageList);


response.setContentType("text/plain");
PrintWriter out = null;
try {
out = new PrintWriter(new OutputStreamWriter(response
.getOutputStream(), "utf-8"));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

 String callback = request.getParameter("callback");  
     out.println(callback+"("+message+")");
 
out.flush();
out.close();
return null;
}