SpringBoot全局配置LocalDate/LocalTime/LocalDateTime的序列化和反序列化

如何优雅的配置

SpringBoot web starter自动注入了jackson，且包含datetype-jsr310依赖支持LocalDate/LocalTime/LocalDateTime的序列化和反序列化，不过还需要我们手动配置下才生效。

建议通过注入Jackson2ObjectMapperBuilderCustomizer来优雅的实现。（不要手动去创建ObjectMapper，这样会覆盖很多默认配置，默认的配置挺好的，如果默认不满足需求，通过Jackson2ObjectMapperBuilderCustomizer来配置）

java 复制代码

package com.example.demo.config;

import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

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

/**
 * 全局配置LocalDate/LocalTime/LocalDateTime的序列化和反序列化
 *
 * @see JacksonAutoConfiguration
 */
@Configuration
public class JacksonConfiguration {

    private static final DateTimeFormatter FORMAT_DATE = DateTimeFormatter.ofPattern("yyyy-MM-dd");
    private static final DateTimeFormatter FORMAT_TIME = DateTimeFormatter.ofPattern("HH:mm:ss");
    private static final DateTimeFormatter FORMAT_DATE_TIME = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return jacksonObjectMapperBuilder -> {

            JavaTimeModule javaTimeModule = new JavaTimeModule();

            javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(FORMAT_DATE));
            javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(FORMAT_DATE));

            javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(FORMAT_TIME));
            javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(FORMAT_TIME));

            javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(FORMAT_DATE_TIME));
            javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(FORMAT_DATE_TIME));

            jacksonObjectMapperBuilder.modules(javaTimeModule);

        };
    }
}

最后

建议新项目彻底去除 java.util.Date 或 java.sql.Date 相关日期类的使用，全面使用LocalDate/LocalTime/LocalDateTime！！！