环境:
jdk: openjdk11
操作系统: windows 10教育版1903
目的:
如题，当一个对象里有些属性值为null 的不想参与json序列化时，可以添加如下注解
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonIgnore; //这个是类注解,表示该类实例化的对象里，值为null的字段不参与序列化
@JsonInclude(JsonInclude.Include.NON_NULL)
@Setter
@Getterpublic class AbilityEntity {
private Long id;
private String name;
//JsonIgnore注解 表示 每次json处理都忽略createTime属性
@JsonIgnore
private Long createTime;//unix时间戳,ms
}
以下是单元测试(DemoApplicationTests.java):
package com.example.demo; import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Getter;
import lombok.Setter;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest; @SpringBootTest
class DemoApplicationTests { @Test
void contextLoads() {
AbilityEntity ability = new AbilityEntity();
ability.setId(1L);
System.out.println(JSONObject.toJSON(ability));
ability.setName("");//只要不是null, 都不会被忽略
System.out.println(JSONObject.toJSON(ability)); } @JsonInclude(JsonInclude.Include.NON_NULL)
@Setter
@Getter
public class AbilityEntity{
private Long id;
private String name;
} }
console
{"id":1}
{"name":"","id":1}