Spring boot格式化LocaleDateTime

2023年09月22日

一般默认在实体类设置日期格式为 LocalDateTime，但是输出API JSON时候，一般都会使用 DateTime 格式。

单个字段

可以使用注解进行转换转换

@JsonSerialize(using = LocalDateTimeSerializer.class)
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JsonProperty("date")
LocalDateTime getDate();

全局配置

application.yml

spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss

配置类



import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;


@Configuration
public class LocalDateTimeConfig {

    @Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
    private String pattern;

    // localDateTime 序列化器
    @Bean
    public LocalDateTimeSerializer localDateTimeSerializer() {
        return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern));
    }
    // localDateTime 反序列化器
    @Bean
    public LocalDateTimeDeserializer localDateTimeDeserializer() {
        return new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(pattern));
    }

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        //这种方式同上
        return builder -> {
            builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
            builder.deserializerByType(LocalDateTime.class,localDateTimeDeserializer());
            builder.simpleDateFormat(pattern);
        };
    }

}