uniRequest.post('/orderParking',{
                parkingRecord:this.ParkingRecord
            })

我刚开始只是写@RequestBody ParkingRecord parkingRecord
一直获取的都是null,
直到用了Map标签才终于获取到参数了

 @RequestMapping(value = "/orderParking",produces="application/json",method = RequestMethod.POST)
    public R orderParking(@RequestBody Map<String,ParkingRecord> parkingRecord)
    

获取到map的key，就可以获取值了

 @RequestMapping(value = "/orderParking",produces="application/json",method = RequestMethod.POST)
    public R orderParking(@RequestBody Map<String,ParkingRecord> parkingRecord){
        System.out.print(parkingRecord.toString());
        //获取当前时间
        Date date = new Date();
        String nowTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
        Timestamp timestamp = Timestamp.valueOf(nowTime);
        ParkingRecord parkingRecord1 = parkingRecord.get("parkingRecord");
        parkingRecord1.setStartTime(timestamp);
        boolean res = parkingRecordService.save(parkingRecord1);
        Map<String, Object> map = new HashMap<>();
       map.put("res",res);
       map.put("mes","预约成功");
       return R.ok(map);
    }

有人说是前后端参数名称不一致：在实体类的属性上加一个注解
然而这个没有解决我的问题

@JsonProperty(value = "car_license")
 private String carLicense;

也有人说是因为lombok的问题,自己用idea的快捷键生成，但也没有解决,
再就是实体类的属性名不符合java规范问题：我刚开始是car_lincese这样命名，都需要改为驼峰式命名，carLinces