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当我将实体转换为JSON时,为什么本地日期格式发生了变化?

httpentity localdate java

0

Royce · 技术社区 · 5 年前

我的目标是将日期存储到数据库中。为了做这个应用,我使用了Springboot,JPA,H2,…

我用 LocalDate 希望的格式是 yyyy-MM-dd .

实体

@Entity
public class MyObject {

    @Id
    private String id;
    private LocalDate startdate;
    private LocalDate enddate;

    public MyObject() {}

    public MyObject(LocalDate enddate) {
        this.startdate = LocalDate.now();
        this.enddate = enddate;
    }

    ...
}

主要的

private DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
MyObject myObject = new MyObject(LocalDate.parse("2019-03-01", formatter));
myObject.setId(UUID.randomUUID().toString());
myObjectResource.save(myObject);

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
System.out.println(myObject.getStartdate()); // 2019-02-23
System.out.println(myObject.getEnddate()); // 2019-03-01
HttpEntity<String> entity = new HttpEntity<>(this.toJsonString(myObject), headers);
System.out.println(entity.toString()); // <{"id":"ba6649e4-6e65-4f54-8f1a-f8fc7143b05a","startdate":{"year":2019,"month":"FEBRUARY","dayOfMonth":23,"dayOfWeek":"SATURDAY","era":"CE","dayOfYear":54,"leapYear":false,"monthValue":2,"chronology":{"id":"ISO","calendarType":"iso8601"}},"enddate":{"year":2019,"month":"MARCH","dayOfMonth":1,"dayOfWeek":"FRIDAY","era":"CE","dayOfYear":60,"leapYear":false,"monthValue":3,"chronology":{"id":"ISO","calendarType":"iso8601"}}},[Content-Type:"application/json"]>

private String toJsonString(Object o) throws Exception {
    ObjectMapper om = new ObjectMapper();
    return om.writeValueAsString(o);
}

你能帮我理解为什么约会 entity.toString() 和以前不一样 getMethods() ?

谢谢你的帮助!

1 回复 | 直到 5 年前

1

LppEdd 5 年前

LocalDate.parse 返回新的 LocalDate 对象。中指定的格式选项 DateTimeFormatter 两天前迷路。

Jackson (the JSON 你正在使用的库)不知道你以前是如何“格式化”的 本地日期 ,因此它使用自己的格式。

您可以注册 JavaTimeModule

final ObjectMapper om = new ObjectMapper();
om.registerModule(new JavaTimeModule());

或者你可以提供你的定制 JsonSerializer<T> .