解决angular的post请求后SpringMVC后台接收不到参数值

@RequestMapping(method = RequestMethod.POST)
  @ResponseBody
  public Map<String, Object> save(
      @RequestParam(value = "isform", required = false) String isform) {
    System.out.println("isform value: " + isform);
    return null;
 
  }

@RequestMapping(method = RequestMethod.POST)
  @ResponseBody
  public Map<String, Object> save(
      @RequestParam(value = "isform", required = false) @RequestBody String isform) {
    System.out.println("isform value: " + isform);
    return null;
 
  }

app.config(function($httpProvider) {
  $httpProvider.defaults.headers.put['Content-Type'] = 'application/x--form-urlencoded';
  $httpProvider.defaults.headers.post['Content-Type'] = 'application/x--form-urlencoded';
 
});

app.config(function($httpProvider) {
  $httpProvider.defaults.headers.put['Content-Type'] = 'application/x--form-urlencoded';
  $httpProvider.defaults.headers.post['Content-Type'] = 'application/x--form-urlencoded';
 
  // Override $http service's default transformRequest
  $httpProvider.defaults.transformRequest = [function(data) {
    /
      The workhorse; converts an object to x--form-urlencoded serialization.
      @param {Object} obj
      @return {String}
     /
    var param = function(obj) {
      var query = '';
      var name, value, fullSubName, subName, subValue, innerObj, i;
 
      for (name in obj) {
        value = obj[name];
 
        if (value instanceof Array) {
          for (i = 0; i < value.length; ++i) {
            subValue = value[i];
            fullSubName = name + '[' + i + ']';
            innerObj = {};
            innerObj[fullSubName] = subValue;
            query += param(innerObj) + '&';
          }
        } else if (value instanceof Object) {
          for (subName in value) {
            subValue = value[subName];
            fullSubName = name + '[' + subName + ']';
            innerObj = {};
            innerObj[fullSubName] = subValue;
            query += param(innerObj) + '&';
          }
        } else if (value !== undefined && value !== null) {
          query += encodeURIComponent(name) + '='
              + encodeURIComponent(value) + '&';
        }
      }
 
      return query.length ? query.substr(0, query.length - 1) : query;
    };
 
    return angular.isObject(data) && String(data) !== '[object File]'
        ? param(data)
        : data;
  }];
});