@JsonSerialize 使用：注解方式实现条件判断属性值、条件修改属性值

矫情吗；* 2022-03-29 02:18 785阅读 0赞

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1. 数据库中是 1、0 记录性别。

预期效果为：当查到属性值为 1 时，就给序列化后的 json 中性别字段赋值为 “男” ， 0 则 ”女“ 。

2. 注解方式实现，使用方式：

package gentle.entity;
    
    import com.fasterxml.jackson.databind.annotation.JsonSerialize;
    import gentle.util.GenderSerializer;
    
    
    @Table(name = "sys_user")
    public class User {
    
        @JsonSerialize(using = GenderSerializer.class)
        private String gender;
    
      
        public String getGender() {
            return gender;
        }
    
        public void setGender(String gender) {
            this.gender = gender;
        }
    
      }

3. 注解实现类：

package gentle.util;
    
    import com.fasterxml.jackson.core.JsonGenerator;
    import com.fasterxml.jackson.core.JsonProcessingException;
    import com.fasterxml.jackson.databind.JsonSerializer;
    import com.fasterxml.jackson.databind.SerializerProvider;
    
    import java.io.IOException;
    
    /**
     * 性别注解（1:男 0：女）
     *
     * @author silence
     * @date 2019/1/7 16:12
     */
    public class GenderSerializer extends JsonSerializer<String> {
    
        @Override
        public void serialize(String value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
    
            if ("1".equals(value)) {
                gen.writeString("男");
            } else {
                gen.writeString("女");
            }
        }
    }

4. 运行效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMTQ0NDI_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMTQ0NDI_size_16_color_FFFFFF_t_70 1][]

附：@JsonDeserialize使用方法详见：[http://fasterxml.github.io/jackson-databind/javadoc/2.2.0/com/fasterxml/jackson/databind/annotation/JsonDeserialize.html][http_fasterxml.github.io_jackson-databind_javadoc_2.2.0_com_fasterxml_jackson_databind_annotation_JsonDeserialize.html]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMTQ0NDI_size_16_color_FFFFFF_t_70 2][]

[Link 1]: https://www.captainai.net/jiangyu1013/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMTQ0NDI_size_16_color_FFFFFF_t_70]: /images/20220329/61b6539e3fbf47fb8f1e40014f324063.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMTQ0NDI_size_16_color_FFFFFF_t_70 1]: /images/20220329/3a2ce0a2937d433391954f97052d9b31.png
[http_fasterxml.github.io_jackson-databind_javadoc_2.2.0_com_fasterxml_jackson_databind_annotation_JsonDeserialize.html]: http://fasterxml.github.io/jackson-databind/javadoc/2.2.0/com/fasterxml/jackson/databind/annotation/JsonDeserialize.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMTQ0NDI_size_16_color_FFFFFF_t_70 2]: /images/20220329/29bd9b4dee194d8292d789f27d04889b.png