Java 用Jackson JSON序列化(serialize)时间日期Joda DateTime

1、使用Maven引用Jackson

pom.xml增加如下配置：

<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-joda</artifactId>
  <version>2.5.4</version>
</dependency>  

2、使用自定义序列化器CustomDateSerializer

1）在需要的格式化时间的对象

@JsonSerialize(using = CustomDateSerializer.class)
public DateTime getDate() { ... }

2）自定义序列化器CustomDateSerializer

public class CustomDateSerializer extends JsonSerializer<DateTime> {
    private static DateTimeFormatter formatter = 
        DateTimeFormat.forPattern("dd-MM-yyyy");
    @Override
    public void serialize(DateTime value, JsonGenerator gen, 
                          SerializerProvider arg2)
        throws IOException, JsonProcessingException {
        gen.writeString(formatter.print(value));
    }
}

3、通过JodaModule使用默认时间日期格式

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JodaModule());

4、通过CustomObjectMapper实现

1）对象映射器执行全局配置

<bean id="jacksonObjectMapper" class="com.company.CustomObjectMapper" />
<bean id="jacksonSerializationConfig" class="org.codehaus.jackson.map.SerializationConfig"
    factory-bean="jacksonObjectMapper" factory-method="getSerializationConfig" >
</bean>

2）自定义映射器CustomObjectMapper

public class CustomObjectMapper extends ObjectMapper {
    public CustomObjectMapper() {
        super();
        configure(Feature.WRITE_DATES_AS_TIMESTAMPS, false);
        setDateFormat(new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss 'GMT'ZZZ (z)"));
    }
}

5、使用@JsonFormat实现定义时间日期格式

1）在序列化对象的方法上使用@JsonFormat

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
public DateTime getDate() {
    return date;
}

2）使用ObjectMapper序列化

   ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JodaModule());
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    ObjectWriter ow = mapper.writer();
    try {
        String logStr = ow.writeValueAsString(log);
        outLogger.info(logStr);
    } catch (IOException e) {
        logger.warn("JSON mapping exception", e);
    }