解决方式一、

js代码

$(document).ready(function(){
   var url='http://localhost:8080/WorkGroupManagment/open/getGroupById"
       +"?id=1&callback=?';
   $.ajax({
     url:url,dataType:'jsonp',processData: false,type:'get',success:function(data){
       alert(data.name);
     },error:function(XMLHttpRequest,textStatus,errorThrown) {
       alert(XMLHttpRequest.status);
       alert(XMLHttpRequest.readyState);
       alert(textStatus);
      }});
   });

@RequestMapping(value = "/getGroupById")
  public String getGroupById(@RequestParam("id") Long id,HttpServletRequest request,HttpServletResponse response)
      throws IOException {
    String callback = request.getParameter("callback");
    ReturnObject result = null;
    Group group = null;
    try {
      group = groupService.getGroupById(id);
      result = new ReturnObject(group,"获取成功",Constants.RESULT_SUCCESS);
    } catch (BusinessException e) {
      e.printStackTrace();
      result = new ReturnObject(group,"获取失败",Constants.RESULT_Failed);
    }
    String json = JsonConverter.bean2Json(result);
    response.setContentType("text/html");
    response.setCharacterEncoding("utf-8");
    PrintWriter out = response.getWriter();
    out.print(callback + "(" + json + ")");
    return null;
  }

解决方式二、

使用jsonp

var url="http://localhost:8080/WorkGroupManagment/open/getGroupById"
    +"?id=1&callback=?";
$.jsonp({
  "url": url,"success": function(data) {
     alert(data.result.name);

  },"error": function(d,msg) {

    alert("Could not find user "+msg);  }});