SpringBoot - jackson 序列化配置,支持jdk8 时间类型和解决科学计数法

jdk8时间序列化配置#
Copy@Configuration
public class JacksonConfig {
    @Bean
    public ObjectMapper serializingObjectMapper() {
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        /** 序列化配置,针对java8 时间 **/
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));

        /** 反序列化配置,针对java8 时间 **/
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        
        return Jackson2ObjectMapperBuilder.json().modules(javaTimeModule).build();
    }        
}

另个写法,时间和double类型序列化配置#
Copy@Configuration
public class JacksonConfig {
    @Bean
    public ObjectMapper serializingObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        
        // 设置时区
        objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
    // 设置时间格式
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

        JavaTimeModule javaTimeModule = new JavaTimeModule();
        /** 序列化配置,针对java8 时间 **/
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));

        /** 反序列化配置,针对java8 时间 **/
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        
        /** 声明自定义模块,配置double类型序列化配置 **/
        SimpleModule module = new SimpleModule("DoubleSerializer", new Version(1, 0, 0, ""));
        // 注意Double和double需要分配配置
        module.addSerializer(Double.class, new DoubleSerializer());
        module.addSerializer(double.class, new DoubleSerializer());

        /** 注册模块 **/
        objectMapper
                .registerModule(javaTimeModule)
                .registerModule(module)
        .registerModule(new Jdk8Module())
        .registerModule(new ParameterNamesModule());
        return objectMapper;
    }        
}

public class DoubleSerializer extends JsonSerializer<Double> {

    @Override
    public void serialize(Double value, JsonGenerator gen, SerializerProvider serializers)
            throws IOException {
        BigDecimal d = new BigDecimal(value.toString());
        gen.writeNumber(d.stripTrailingZeros().toPlainString());
    }

    @Override
    public Class<Double> handledType() {
        return Double.class;
    }
}

关于解决double类型科学计数法的问题,还可以做如下配置,不需要自己写DoubleSerializer
CopyobjectMapper.enable(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN);