Jackson2ObjectMapperBuilderCustomizer 开启全局默认类型

秒速五厘米 2022-11-26 12:57 372阅读 0赞

1.枚举类

public enum GenderEnum implements Enumerator {
    
        UNKNOWN(0, "未知"),
    
        MALE(1, "男"),
    
        FEMALE(2, "女");
    
    
        private final Integer code;
        private final String description;
    
        GenderEnum(Integer code, String description) {
            this.code = code;
            this.description = description;
        }
    
    
        @Override
        public Integer code() {
            return code;
        }
    
        @Override
        public String description() {
            return description;
        }
    }

2.全局配置

@Configuration
    public class GlobalConfig {
    
        @Bean
        public Jackson2ObjectMapperBuilderCustomizer enumCustomizer(){
            return jacksonObjectMapperBuilder -> jacksonObjectMapperBuilder.serializerByType(Enumerator.class, new JsonSerializer<Enumerator>() {
                @Override
                public void serialize(Enumerator value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
                    gen.writeStartObject();
                    gen.writeNumberField("code",value.code());
                    gen.writeStringField("description",value.description());
                    gen.writeEndObject();
                }
            });
        }
    
    }

3.测试代码

@Test
        void enumTest() {
            try {
                String s = objectMapper.writeValueAsString(GenderEnum.MALE);
                // 输出字符串 MALE
                System.out.println(s);
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
        }

没开启全局设置，运行结果如下：

"MALE"

开启全局设置，运行结果如下：

\{"code":1,"description":"男"\}