我用 Spring Boot 開發(fā)了一個休息服務(wù)。我想以毫秒為單位返回用戶生日的 json 響應(yīng)。如何將java.time.LocalDateTime對象序列化為毫秒？我的模型類： @Entity(name = "users") public class User implements Serializable { @Id @GeneratedValue @Column(name = "user_id") private Long id; @Column(name = "first_name") private String firstName; @Column(name = "last_name") private String lastName; @Column(name = "date_of_birth") private LocalDateTime dateOfBirth; . . . }目前的回應(yīng)：{ . . ."dateOfBirth":[2018,7,25,7,0],. . . }首選回復(fù)：{ . . ."dateOfBirth": 1532786354419,. . . }
3 回答
侃侃爾雅
TA貢獻(xiàn)1801條經(jīng)驗 獲得超16個贊
用 @JsonSerialize(using = CustomSerializer.class)
@Entity(name = "users")
public class User implements Serializable {
@Id
@GeneratedValue
@Column(name = "user_id")
private Long id;
@Column(name = "first_name")
private String firstName;
@Column(name = "last_name")
private String lastName;
@JsonSerialize(using = CustomSerializer.class)
@Column(name = "date_of_birth")
private LocalDateTime dateOfBirth;
. . .
}
自定義序列化程序類：
public class CustomSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
//add your custom date parser
gen.writeString(value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()+"");
}
}
FFIVE
TA貢獻(xiàn)1797條經(jīng)驗 獲得超6個贊
如果您不想裝飾所有對象，@JsonSerialize可以將對象映射器配置為始終返回 long for LocalDateTime.
@Bean
public ObjectMapper objectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateSerializer());
javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateDeserializer());
objectMapper.registerModule(javaTimeModule);
return objectMapper;
}
和 de- 和序列化器。
public class LocalDateSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
gen.writeString(String.valueOf(value.atZone(ZoneId.systemDefault()).toEpochSecond()));
}
}
public class LocalDateDeserializer extends JsonDeserializer<LocalDateTime> {
@Override
public LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
return LocalDateTime.ofInstant(Instant.ofEpochSecond(Long.parseLong(p.getValueAsString())), ZoneId.systemDefault());
}
}
在您的示例中，您使用的出生日期可能是LocalDate.
隔江千里
TA貢獻(xiàn)1906條經(jīng)驗 獲得超10個贊
為什么不按如下方式存儲日期屬性：
@Temporal(TemporalType.TIMESTAMP)
private Date date = new Date();
它以毫秒為單位給出日期。將其格式化為所需的輸出是應(yīng)用層的責(zé)任。不要在實體本身上做一些注釋。
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