前后端联调跨域问题

1.前端jquery ajax 需要引 jquery包

$.ajax({
             type: "post",
             url: "http://jmzs.nj.youedata.com/jmrh/api/jmrh",
             contentType: 'application/x-www-form-urlencoded;charset=utf-8',
             // data: {},
             dataType: "jsonp",  //数据格式设置为jsonp
             jsonp:"callback",
             success: function(data){
                             console.log(data);
                          },
                 error:function(e){
                                 console.log(e);
                     }
             });

   

2.后端 controller层

 

   @ResponseBody
    @RequestMapping(value = "/jmrh")
    public String jmrh(@RequestParam("callback") String callback){
        String name = "name";
        String yjzb = "yjzb ";
         return callback+"("+RespResult.getInstance().setInfo("num", num).setInfo("string", string).toJson()+")"; 
    }

工具类:

RespResult:https://blog.youkuaiyun.com/u012417405/article/details/86245139