Jackson 序列化 JSON 时忽略 Null 值

一、忽略某一个值为 Null 的属性

import com.fasterxml.jackson.annotation.JsonInclude;

public class Person {
    private String name;

    @JsonInclude(JsonInclude.Include.NON_NULL)
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

}

二、忽略 Class 下的所有值为 Null 的属性

import com.fasterxml.jackson.annotation.JsonInclude;

@JsonInclude(JsonInclude.Include.NON_NULL)
public class Person {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

}

三、全局配置，忽略所有待序列化对象的 Null 属性

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonTest {
    private final static ObjectMapper objectMapper = new ObjectMapper();

    static {
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    }

    public static void main(String[] args) throws JsonProcessingException {

        Person person = new Person();
        person.setName("iyushu");

        System.out.println(objectMapper.writeValueAsString(person));
    }
    
}