Java 8之后，日期类的处理建议使用java.time包中对应的LocalDateTime, LocalDate, LocalTime类。

1、注解

@JsonFormat主要是后台到前台的时间格式的转换，即从数据库读取数据到后端的过程，序列化
@DateTimeFormat主要是前端到后端的时间格式的转换，反序列化
示例：

//数据库到后端的转换
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
//后端到前端的转换
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")

springboot中默认使用jackson做json序列化和反序列化

2 、全局配置序列化

/**
 * LocalDateTime序列化配置
 */
@Configuration
public class LocalDateTimeSerializerConfig {
    /*
    如果在配置文件中有spring.jackson.date-format，则取其中的值，
    如果没有配置，则为yyyy-MM-dd HH:mm:ss
    */
    @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));
    }
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
    }
}

3、日期转换

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
@Configuration
public class DateConverterConfig {
       @Bean
    public Converter<String, LocalDateTime> LocalDateTimeConvert() {
        return new Converter<String, LocalDateTime>() {
            @Override
            public LocalDateTime convert(String source) {
                DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
                LocalDateTime date = null;
                try {
                    date = LocalDateTime.parse(source, df);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return date;
            }
        };
    }
    @Bean
    public Converter<String, LocalDate> LocalDateConvert() {
        return new Converter<String, LocalDate>() {
            @Override
            public LocalDate convert(String source) {
                DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd");
                LocalDate date = null;
                try {
                    date = LocalDate.parse(source, df);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return date;
            }
        };
    }
    @Bean
    public Converter<String, LocalTime> LocalTimeConvert() {
        return new Converter<String, LocalTime>() {
            @Override
            public LocalTime convert(String source) {
                DateTimeFormatter df = DateTimeFormatter.ofPattern("HH:mm:ss");
                LocalTime date = null;
                try {
                    date = LocalTime.parse(source, df);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return date;
            }
        };
    }
}

4、 注意事项

实体类必须实现序列化。

对application.yml 配置日期

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

5、去除时间中间的T

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss", Locale.US);
String strLocalDate = "2015-10-23T03:34:40";
LocalDateTime localDate = LocalDateTime.parse(strLocalDate, formatter);
System.out.println(localDate);
System.out.println(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(localDate));
System.out.println(DateTimeFormatter.ofPattern("HH:mm:ss yyyy-MM-dd ").format(localDate));

打印

2015-10-23T03:34:40
2015-10-23 03:34:40
03:34:40 2015-10-23

DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(deliverGoods.getCreateTime())