SpringBoot 中 JSON 的时间格式
SpringBoot 默认情况下生成的时间如下:
2024-03-06T02:23:15.000+00:00
可能我们需要格式形如:yyyy-MM-dd HH:mm:ss,那要怎么配置呢?
第一种方式
1 在 application.yml 中配置
spring:
jackson:
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8
2 接着,需要在代码中使用Jackson库对日期进行序列化和反序列化。可以在实体类上添加注解
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
或在对象的属性上添加注解
@JsonProperty("birthDate")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@Setter
@Getter
public class User {
private Long id;
private String name;
@JsonProperty("birthDate") //这个可以省略
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date birth;
}
第二种可以手动转换
编写一个类来配置ObjectMapper,具体代码如下:
@Configuration
public class JacksonConfig {
@Bean
public Jackson2ObjectMapperBuilderCustomizer jacksonCustomizer() {
return builder -> {
builder.serializerByType(Date.class, new CustomDateSerializer());
builder.deserializerByType(Date.class, new CustomDateDeserializer());
};
}
private static class CustomDateDeserializer extends StdDeserializer<Date> {
private static final long serialVersionUID = 1L;
private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
public CustomDateDeserializer() {
super(Date.class);
}
@Override
public Date deserialize(JsonParser parser, DeserializationContext context) throws IOException {
String dateStr = parser.getText();
LocalDateTime localDateTime = LocalDateTime.parse(dateStr, DATE_TIME_FORMATTER);
return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
}
}
private static class CustomDateSerializer extends StdSerializer<Date> {
private static final long serialVersionUID = 1L;
private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
public CustomDateSerializer() {
super(Date.class);
}
@Override
public void serialize(Date value, JsonGenerator generator, SerializerProvider provider) throws IOException {
LocalDateTime dateTime = LocalDateTime.ofInstant(value.toInstant(), ZoneId.systemDefault());
String str = dateTime.format(DATE_TIME_FORMATTER);
generator.writeString(str);
}
}
}