SpringMVC中JSONP的基本使用

 @RequestMapping("/check/{param}/{type}")
     @ResponseBody
     public Object checkData(@PathVariable String param, @PathVariable Integer type, String callback) {

         TaotaoResult result = null;

         // 参数有效性校验
         if (StringUtils.isBlank(param)) {
             result = TaotaoResult.build(400, "校验内容不能为空");
         }
         if (type == null) {
             result = TaotaoResult.build(400, "校验内容类型不能为空");
         }
         if (type != 1 && type != 2 && type != 3) {
             result = TaotaoResult.build(400, "校验内容类型错误");
         }
         // 校验出错
         if (null != result) {
             if (null != callback) {
                 JSONPObject jsonpObject = new JSONPObject(callback, result);
                 return jsonpObject;
             } else {
                 return result;
             }
         }
         // 调用服务
         try {
             result = userService.checkData(param, type);

         } catch (Exception e) {
             result = TaotaoResult.build(500, ExceptionUtil.getStackTrace(e));
         }

         if (null != callback) {
             JSONPObject jsonpObject = new JSONPObject(callback, result);
             return jsonpObject;
 //            MappingJacksonValue mappingJacksonValue = new MappingJacksonValue(result);
         //    mappingJacksonValue.setJsonpFunction(callback);
 //            mappingJacksonValue.setValue(callback);
 //            return mappingJacksonValue;
         } else {
             return result;
         }
     }