【序列化与反序列化】Jackson

1. jackson序列化和反序列化

 依赖

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.9.8</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.8</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.9.0</version>
</dependency>
或者以下依赖  (spring-boot-starter-web包含了以上依赖)
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>2.1.5.RELEASE</version>
</dependency>

 示例

package com.chenly.serialize.jackson;

import com.chenly.serialize.bean.Score;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import java.util.Date;

/**
 * @author: chenly
 * @date: 2022-11-28 16:48
 * @description:
 * @version: 1.0
 */
public class JacksonTest {

    public static void main(String[] args) {
        Score score1 = Score.builder()
                .className("一班")
                .createDate(new Date())
                .stuName("张三").course("生物").score(90).build();
        ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().build();
        byte[] bytes ;
        Object object;
        try {
            //序列化成json字符串
            String jsonStr = objectMapper.writeValueAsString(score1);
            System.out.println(jsonStr);
            //反序列化
            object = objectMapper.readValue(jsonStr,Score.class);
            System.out.println(object);

            //序列化成byte
            bytes = objectMapper.writeValueAsBytes(score1);
            //反序列化
            object = objectMapper.readValue(bytes,Score.class);
            System.out.println(object);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

 

2. jackson常用注解

Jackson 包含了很多注解，用来个性化序列化和反序列化操作，主要包含如下注解。

• @JsonProperty：作用在属性上，用来为JSON Key指定一个别名
• @JsonIgnore：作用在属性上，用来忽略此属性
• @JsonIgnoreProperties：作用在类上，忽略一组属性，比如@JsonIgnoreProperties({"id","name"})
• @JsonFormat：作用在属性上,用于日期的格式化，如:

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date createDate;

 

 

 

 

 

 

 

 

 

 

 

参考地址

1、https://www.cnblogs.com/cnjavahome/p/8393178.html