全局序列化配置之Instant/BigDecimal

最新推荐文章于 2024-09-20 16:30:19 发布

原创最新推荐文章于 2024-09-20 16:30:19 发布 · 586 阅读

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#java #开发语言

该文章展示了如何在Java中自定义Jackson配置，包括创建一个主ObjectMapper实例，用于XML解析，以及注册模块来处理Instant和BigDecimal的序列化与反序列化，确保数值精确无误。Instant序列化为Unix时间戳，反序列化则从长整型恢复，BigDecimal序列化时会去掉多余的零。

1.全局配置类

@Configuration
public class JacksonConfiguration {

  @Bean
  @Primary
  public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
    JsonFactory jsonFactory =
        new JsonFactoryBuilder().enable(JsonWriteFeature.WRITE_NUMBERS_AS_STRINGS).build();
    ObjectMapper objectMapper = builder.createXmlMapper(false).factory(jsonFactory).build();
    SimpleModule module = new SimpleModule();
    module.addSerializer(Sort.class, new SortJsonComponent.SortSerializer());
    module.addDeserializer(Sort.class, new SortJsonComponent.SortDeserializer());
    module.addSerializer(Instant.class, InstantJsonSerializer.INSTANCE);
    module.addDeserializer(Instant.class, InstantJsonDeserializer.INSTANCE);
    module.addSerializer(BigDecimal.class, bigDecimalJsonSerializer());
    objectMapper.registerModules(new PageJacksonModule(), module);
    objectMapper.enable(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS);
    objectMapper.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);

    return objectMapper;
  }

2.Instant序列化

public class InstantJsonSerializer extends JsonSerializer<Instant> {

  public static final InstantJsonSerializer INSTANCE = new InstantJsonSerializer();

  @Override
  public void serialize(
      Instant instant, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
      throws IOException {
    jsonGenerator.writeNumber(instant.toEpochMilli());
  }
}

3.Instant反序列化

public class InstantJsonDeserializer extends JsonDeserializer<Instant> {

  public static final InstantJsonDeserializer INSTANCE = new InstantJsonDeserializer();

  @Override
  public Instant deserialize(JsonParser jsonParser, DeserializationContext 
  deserializationContext)
      throws IOException {
    return Instant.ofEpochMilli(jsonParser.getLongValue());
  }
}

4.Bigdecimal 去掉多位数多余的零

public JsonSerializer<BigDecimal> bigDecimalJsonSerializer() {
    return new JsonSerializer<BigDecimal>() {
      @Override
      public void serialize(
          BigDecimal bigDecimal, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
          throws IOException {
        if (!ObjectUtils.isEmpty(bigDecimal)) {
          jsonGenerator.writeNumber(bigDecimal.stripTrailingZeros());
        }
      }
    };
  }