首页 计算机学科 java spring 代码案例

# @JsonFormat

作用：从数据库或者其它地方获取到时间但是通过 Controoler 返回的 json 格式时却是毫秒值的我们要想能看得懂需要进行格式化

database

+------------+---------+---------+------------+----+
| potime     | kecheng | xuefei  | jiaofei    | id |
+------------+---------+---------+------------+----+
| 2023-04-17 | Java    | 5099.89 | 2023-04-17 |  1 |
+------------+---------+---------+------------+----+

domain

@Getter
@Setter
@ToString
public class StudentXinxi {
    @JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss") // 出参
    private Date potime;
    private String kecheng;
    private Double xuefei;
    @JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd HH:mm:ss") // 出参
    private Date jiaofei;
    private Integer id;
}

controller

@Controller
public class StudentController {
    @Autowired
    private StudentService service;
    @RequestMapping("/findAll")
    @ResponseBody
    public List<StudentXinxi> findAll(){
        return service.findAll();
    }
}

请求浏览器后的结果

//before
[
  {
    "potime": 1681660800000,
    "kecheng": "Java",
    "xuefei": 5099.89,
    "jiaofei": 1681660800000,
    "id": 1
  }
]
//after
[
  {
    "potime": "2023-04-17 00:00:00",
    "kecheng": "Java",
    "xuefei": 5099.89,
    "jiaofei": "2023-04-17 00:00:00",
    "id": 1
  }
]