Return JSON from servlet

IE caches AJAX requests aggressively (more than Firefox, Chrome, and Safari, anyway).Sometimes you need to set cache header controller when request. Like cache:false. I tried to fix your code like this

request.setCharacterEncoding("utf8");        //response.setCharacterEncoding("utf8");        response.setContentType("application/json");        PrintWriter out = response.getWriter();        JSONObject jsonObj = (JSONObject) JSONValue.parse(request.getParameter("para"));        System.out.println(jsonObj.get("message"));        JSONObject obj = new JSONObject();        obj.put("message", "hello from server");        out.print(obj.toString());

I changed your response content-type from application/json; charset=utf8 to just application/json and that worked.

I was having the same problem. It was working well on Firefox but not on IE...I found out reading this post that my problem was related to the 'Content-Type'. The problem seems that that IE has problem with 'charset=UTF8'. However, if you use 'charset=UTF-8' (with a dash) it is then working!Your Content-Type should then be: application/json;charset=UTF-8

<%      Gson gs = new Gson();     BeanHelpBH bh = new BeanHelpBH();     List<Baihatmoi> lst = bh.getTenbaihatbyName("Ao moi ca mau");    String bha = gs.toJson(lst);    response.setContentType("application/json");    response.setCharacterEncoding("UTF-8");    out.print(bha);    out.flush();%>  script :         <script>             $(document).ready(function(){               $.get('jsontest.jsp',function(data){            [enter image description here][1] console.log(data);              });           });        </script>