LocalDateTime序列化成yyyy-MM-dd HH:mm_localdatetime 序列化 yyyy-mm-dd-优快云博客

本文链接：https://blog.youkuaiyun.com/lsk_shah/article/details/110648841

本文介绍如何使用Jackson库将Java中的LocalDateTime对象序列化为指定格式的字符串，并演示了如何处理包含泛型的数据对象的序列化与反序列化过程。

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1.LocalDateTime 对象如何序列化成yyyy-MM-dd HH:mm:ss

使用jackon对LocalDateTime对象进行序列化时
会变成这样的格式

	{
	  "year": 2020,
	  "month": "AUGUST",
	  "era": "CE",
	  "dayOfMonth": 1,
	  "dayOfWeek": "TUESDAY",
	  "dayOfYear": 213,
	  "leapYear": false,
	  "monthValue": 8,
	  "chronology": {
	      "id":"ISO",
	      "calendarType":"iso8601"
	   }
	}

如何将他变成 2020-01-02 12:12:12 这样的形式呢

需要这么做


	ObjectMapper mapper = new ObjectMapper();
	mapper.registerModule(new JavaTimeModule());
	mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

就是激活JavaTimeModule

添加依赖


	 <dependency>
	     <groupId>com.fasterxml.jackson.datatype</groupId>
	      <artifactId>jackson-datatype-jsr310</artifactId>
	 </dependency>

2.序列化包含泛型的java对象

假如序列化的对象包含泛型，那么可以使用TypeReference

import com.fasterxml.jackson.core.type.TypeReference;

DataDto<List<VibrationData>> o = mapper.readValue(json, 
  new TypeReference<DataDto<List<VibrationData>>>() {});

DateDto:

package com.tonglei.recevce.entity.dto;

public class DataDto<T> {
    private T data;
    private int len;
    private String instrument;

    public DataDto(){}

    public DataDto(T data, int len, String instrument) {
        this.data = data;
        this.len = len;
        this.instrument = instrument;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public int getLen() {
        return len;
    }

    public void setLen(int len) {
        this.len = len;
    }

    public String getInstrument() {
        return instrument;
    }

    public void setInstrument(String instrument) {
        this.instrument = instrument;
    }
}

参考资料