关于屏蔽返回实体中屏蔽null字段的方法

在网上找到3中方法

1.第一种，新建一个配置类。然后，在实体类上用@Configuration注解

转自：https://blog.csdn.net/qq_40597878/article/details/99851387

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

/**
 * @author Han Yahong<hyhvpn@126.com>
 * @program 51-baojiadan-service
 * @description 返回json空值去掉null和""
 * @create 2018-07-26 11:04
 */
@Configuration
public class JacksonConfig {

    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return objectMapper;
    }
}

2.实体类上加上：注解

import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 
@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
public class test{

    private String user;

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }
}

3.在字段属性上加上 @JsonIgnore

import lombok.Data;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Data
public class test{

    @JsonIgnore
    private String user;
}

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