前端传递多个参数到后台

前端代码：

function generateReport() {
    var params = {};
    var temp = $('#transaction_statistics_market').combobox('getValue').trim();
    if(temp != -1){
        params.marketId = temp;
    }
    params.type = $('#transaction_stats_type').combobox('getValue').trim();
    params.startTime = $('#transaction-stats-datefrom').datebox('getValue').trim();
    params.endTime = $('#transaction-stats-dateto').datebox('getValue').trim();
    $.ajax({
        'url': 'api/generate_report?' + $.param(params),//发送参数
        method: "get",
        dataType: "json",
        success: function (res) {
            if (res.data != null) {
                window.location = "/CSV/" + res.data;
            }
        }
    });
}

后台代码：

@Controller
@RequestMapping(value = "/api")
public class OrderStatisticsByDayController extends BaseController {
    @Autowired
    private OrderStatisticsByDayService orderStatisticsByDayService;
    @RequestMapping(value = "/generate_report", method = RequestMethod.GET)
    @ResponseBody
    public ResponseTO generateReport(@RequestParam(required = false) Long marketId,   //接收参数
                                     @RequestParam(required = false) String startTime,
                                     @RequestParam(required = false) String endTime,
                                     @RequestParam(required = false) Integer type) {
        return success(orderStatisticsByDayService.generateReport( marketId, startTime, endTime, type));
    }
}