1、前端js

1、参数定义：var sendJSONP = function(url){var settings = {url:url,type:"GET",//JSONP下只能GETdataType:"jsonp",async:false,//同步请求，在JSONP下无效jsonp: "callback",//指定参数名jsonpCallback: "jsonp",//指定回调函数名，参数名和回调函数名在url中会被拼接成..&callback=jsonp&..headers: {'Content-Type': 'application/json;charset=utf-8'}}return promising_ajax(url,settings);}2、promise定义：var promising_ajax = function(url, settings) {settings = settings || {};return new Promise(function(resolve, reject) {settings.success = function(data, status, jqXHR) {resolve(data);};settings.error = function(jqXHR, status, error) {reject(wrap_ajax_error(jqXHR, status, error));};ajax(url, settings);});};3、请求发送：var ajax = function (url, settings) {// like $.ajax, but ensure XSRF or Authorization header is setif (typeof url === "object") {// called with single argument: $.ajax({url: '...'})settings = url;url = settings.url;delete settings.url;}return $.ajax(url, settings);};

2、后端代码：

    @RequestMapping(value="/openapi/add/{trainId}",method= RequestMethod.GET,produces = "application/json;charset=utf-8")public void add(@PathVariable Integer trainId, String data, String callback, HttpServletResponse response) throws IOException {response.setHeader("Content-type","application/json;charset=UTF-8");response.getWriter().write(callback+"("+ JSON.toJSONString(obj)+")");
}

3、使用方法

                            service.sendJSONP(url).then(function(resdata){if(resdata.result == 1){}})

jquery ajax常用方法查询：http://www.365mini.com/page/jquery_ajax.htm