https://blog.csdn.net/gengzhy/article/details/132031824

1.在全局配置文件配置

spring:  jackson:    date-format: yyyy-MM-dd HH:mm:ss    time-zone: GMT+8

该配置方式仅支持 Date 类型的日期格式化，不支持LocalDate 及 LocalDateTime 的格式化。

2.通过JavaBean方式配置

com.fasterxml.jackson.databind.ObjectMapper

package com.anze.server.utils.configuration;

import cn.hutool.core.date.DatePattern;
import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
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.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.converter.MappingJackson2MessageConverter;

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

@Configuration
public class JackJsonConfigutation {



    @Bean
    public ObjectMapper objectMapper( ){
        //序列化时候统一日期格式
        MappingJackson2MessageConverter jackson2MessageConverter = new MappingJackson2MessageConverter();
        ObjectMapper objectMapper = jackson2MessageConverter.getObjectMapper();
        objectMapper.registerModules(javaTimeModule());
        return objectMapper;
    }

    private Module javaTimeModule() {
        JavaTimeModule module = new JavaTimeModule();
        module.addSerializer(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATETIME_PATTERN)));
        module.addSerializer(new LocalTimeSerializer(DateTimeFormatter.ofPattern(DatePattern.NORM_TIME_PATTERN)));
        module.addSerializer(new LocalDateSerializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATE_PATTERN)));
        module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATETIME_PATTERN)));
        module.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DatePattern.NORM_DATE_PATTERN)));
        module.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DatePattern.NORM_TIME_PATTERN)));
        return module;
    }


}

注：用到 cn.hutool.core.date.DatePattern#NORM_DATE_PATTERN，即日期格式化字符串：yyyy-MM-dd

另：注意注解 @AutoConfigureBefore(JacksonAutoConfiguration.class)

至此，无需再使用繁琐的注解 @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss") 进行大量重复性的工作了。