HTTP Status 400

@RequestMapping(method = RequestMethod.POST, value = "/search")SjesPage<TurnTable> findTurnTables(@RequestParam(value = "startDate", required = false) String startDate,                                   @RequestParam(value = "endDate", required = false) String endDate,                                   Pageable pageable)

当 startDate为null 时候 会报错： HTTP Status 400 - Required String parameter 'xx' is not present

required  =  false   当 startDate不存在时候赋值 null

解决：

改 required = true，也可以不写，  为空时候 startDate 手动赋值 “ ”

if(StringUtils.isEmpty(startDate)|| StringUtils.isEmpty(endDate)){    return turnTableApiClient.findTurnTables("", "", new PageRequest(page - 1, limit));}