Jersey解析Java 8日期时间

Question

这是我的用户类，我要在我的数据库中保存符合ISO的日期时间。

public class User  {

    @Id
    private String id;

    private String email;

    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
    private LocalDateTime loginDate;

 }

这是我的球衣控制器：

@POST
@Consumes("application/json")
@Produces("application/json")

public Response create(  User user) {

    Map<Object, Object> apiResponse = new HashMap<Object, Object>();
    Map<Object, Object> response  = new HashMap<Object, Object>();


    user = (User) userService.create(user);

}

我如何使用像泽西岛这样的日期时间格式？是否可以发送一个datatime字符串并自动创建Java8日期时间对象？

{        
    "email" : "[e-mail]"
    "loginDate" : "2015-04-17T06:06:51.465Z"
} 

  <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-jersey</artifactId>
 </dependency>

  @JsonDeserialize(using =  LocalDateTimeDeserializer.class)

Answer 1

假设您有JAXB注释支持，Jackson作为JSON提供者······

可以使用XMLAdapter。例如

public class LocalDateTimeAdapter extends XmlAdapter<String, LocalDateTime> {

    @Override
    public LocalDateTime unmarshal(String dateString) throws Exception {
        Instant instant = Instant.parse(dateString);
        LocalDateTime dateTime = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
        return dateTime;
    }

    @Override
    public String marshal(LocalDateTime dateTime) throws Exception {
        Instant instant = dateTime.toInstant(ZoneOffset.UTC);
        return DateTimeFormatter.ISO_INSTANT.format(instant);
    }
}

^{有关详细信息，请参阅Instant API。}

@XmlJavaTypeAdapter(LocalDateTimeAdapter.class)
private LocalDateTime loginDate;

@XmlJavaTypeAdapters({
    @XmlJavaTypeAdapter(type = LocalDateTime.class, 
                        value = LocalDateTimeAdapter.class)
})
package thepackage.of.the.models;

import java.time.LocalDateTime;
import javax.xml.bind.annotation.html" target="_blank">adapters.XmlJavaTypeAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapters;

public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {

    @Override
    public LocalDateTime deserialize(JsonParser jp, 
            DeserializationContext dc) throws IOException, JsonProcessingException {
        ObjectCodec codec = jp.getCodec();
        TextNode node = (TextNode)codec.readTree(jp);
        String dateString = node.textValue();
        Instant instant = Instant.parse(dateString);
        LocalDateTime dateTime = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
        return dateTime;
    } 
}

public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {

    @Override
    public void serialize(LocalDateTime dateTime, JsonGenerator jg, 
            SerializerProvider sp) throws IOException, JsonProcessingException {
        Instant instant = dateTime.toInstant(ZoneOffset.UTC);
        jg.writeString(DateTimeFormatter.ISO_INSTANT.format(instant));
    } 
}

@JsonSerialize(using = LocalDateTimeSerializer.class)
@JsonDeserialize(using = LocalDateTimeDeserializer.class)
public LocalDateTime loginDate; 

@Provider
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class ObjectMapperContextResolver implements ContextResolver<ObjectMapper> {

    final ObjectMapper mapper = new ObjectMapper();

    public ObjectMapperContextResolver() {
        SimpleModule module = new SimpleModule();
        module.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
        module.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer());
        mapper.registerModule(module);
        // add JAXB annotation support if required
        mapper.registerModule(new JaxbAnnotationModule());
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        return mapper;
    }  
}

基本上，用于ummarshalling/marshalling的MessageBodyWriter/MessageBodyReader将调用getContext方法来获取ObjectMapper

注：

>

以上解决方案将按照instant.parse中所述的格式2007-12-03T10:15:30.00z进行解析，并将序列化为datetimeformatter.iso_instant中所述的相同格式

上面还假设您使用Jackson作为序列化程序。我使用下面的依赖项（与Jersey 2.16）进行测试

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.16</version>
</dependency>

依赖项使用JacksonJAXBJSONProvider来支持JAXB注释。如果您使用的是Jersey的较低版本，比如1.x，那么jersey-json依赖项应该提供JAXB注释支持，如果您启用了POJO映射特性的话。对于Jersey1.x，如果您想使用Jackson2，也可以使用这个依赖项

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>2.4.0</version>
</dependency>

这实际上是jersey-media-json-jackson所使用的。因此，您可以显式注册JacksonJAXBJSONProvider，或者添加Jackson包(com.fasterxml.Jackson.jaxrs.json)以列出要扫描的包

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