@JSONFormat,@DateTimeFormat-实体类的时间

前端传给我们的是String格式的,通过@DateTimeFormat(pattern = “yyyy-MM-dd”)注解,我们可以直接将数据转换成Date格式,与数据库的日期类型相对应

后端传给前端,称为出参:通过@JsonFormat(pattern = “yyyy-MM-dd”, timezone = “GMT+8”)注解,我们可以转换成我们想要的格式给前端展示

注意事项:

debug的时候,查看里面的时间还是都有T的,只有最后返回给前端的时候没有T

1.Date要设置时区
2.debug看到的时间还是国外的,但是用postman调用是会便格式的

    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")

private Date createDate;


    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")

private LocalDateTime createDate;

但是上面方法太麻烦了,不是全局的配置,全局解决T的问题用下面你的方法

创建一个配置类

package com.example.demo.config;

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;

/**
 * 关于Java8中localDateTime去掉中间的T
 *
 * @author lc
 * @version 1.0
 * @date 2021/11/11 16:48
 */
@Configuration
public class LocalDateTimeSerializerConfig {
    @Value("${spring.jackson.date-format:yyyy-MM-dd HH:mm:ss}")
    private String pattern;
    @Bean
    public LocalDateTimeSerializer localDateTimeDeserializer() {
        return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(pattern));
    }
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> builder.serializerByType(LocalDateTime.class, localDateTimeDeserializer());
    }
}

解决localdatetime转换成字符串带有T的问题

 LocalDateTime now = LocalDateTime.now();
 DateTimeFormatter dfDate = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
 user.setUpdateTime(dfDate.format(now));

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Origin blog.csdn.net/LC_Liangchao/article/details/121524267