使用JacksonConfig处理id的时候只处理16位以上的id

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
JacksonConfig:
    
@Configuration
public class JacksonConfig {
    @Bean
    public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {
        final Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
        builder.serializationInclusion(JsonInclude.Include.NON_NULL);
        final ObjectMapper objectMapper = builder.build();
        SimpleModule simpleModule = new SimpleModule();
        // Long 转为 String 防止 js 丢失精度
        simpleModule.addSerializer(Long.class, new LongSerializer());
        objectMapper.registerModule(simpleModule);
        // 忽略 transient 关键词属性
        objectMapper.configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER, true);
        // 时区设置
        objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
//        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        return new MappingJackson2HttpMessageConverter(objectMapper);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
同级创建LongSerializer:

// 返回给前端的超过16位Long类型id会被转换成String
public class LongSerializer extends JsonSerializer<Long> {
    @Override
    public void serialize(Long value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        if (value != null && value.toString().length() >= 16) {
            gen.writeString(value.toString());
        } else {
            gen.writeNumber(value);
        }
    }
}