java - Spring 启动 + jackson + LocalDateTime : Date not parsed correctly

Question

我的实体类中有一个 LocalDateTime 属性，但是当它被序列化时，我没有看到预期的格式。

这是类:

public class MyEntity {

     private Integer id;
     @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'")
     private LocalDateTime changeDate;

     // getters and setters

}

jackson 是这样格式化它的:

{
    "id": 56, 
    "changeDate": {
        "hour":14, "minute":19, 
        "nano":797000000, 
        "second":7, 
        "dayOfMonth":24, 
        "dayOfWeek":"TUESDAY", 
        "dayOfYear":297, "month":"OCTOBER", 
        "monthValue":10, 
        "year":2017,
        "chronology": { 
             "id":"ISO",
             "calendarType":"iso8601"
        }
    }
}

请注意，我向我的 pom 添加了以下依赖项:

<dependency>
        <groupId>com.fasterxml.jackson.datatype</groupId>
        <artifactId>jackson-datatype-jsr310</artifactId>
    </dependency>

我不包括版本，因为 spring boot 会处理它。顺便说一下，我正在使用 spring boot 1.5.2.RELEASE。

我还在 application.properties 中包含了以下属性:

spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false

知道为什么日期不是这样格式化的，而是使用我提供的模式吗？

Answer 1

刚刚检查了我的项目。我的反序列化器:

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

import java.io.IOException;
import java.time.LocalDateTime;

import static java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME;

public class JsonDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {

private static final String NULL_VALUE = "null";

@Override
public LocalDateTime deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException {
    ObjectCodec oc = jp.getCodec();
    JsonNode node = oc.readTree(jp);
    String dateString = node.textValue();

    LocalDateTime dateTime = null;
    if (!NULL_VALUE.equals(dateString)) {
        dateTime = LocalDateTime.parse(dateString, ISO_LOCAL_DATE_TIME);
    }
    return dateTime;
}
}

我的序列化器:

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.time.LocalDateTime;

import static java.time.format.DateTimeFormatter.ISO_LOCAL_DATE_TIME;

public class JsonLocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime dateTime, JsonGenerator generator, SerializerProvider provider)
        throws IOException {

    String dateTimeString = dateTime.format(ISO_LOCAL_DATE_TIME);
    generator.writeString(dateTimeString);
}
}

您需要设置自己的格式化程序。

在我的 RestConfig 中我有:

@Configuration
@ComponentScan(value = {"ru.outofrange.controller"})
public class RestConfig extends RepositoryRestConfigurerAdapter {

@Override
public void configureJacksonObjectMapper(ObjectMapper objectMapper) {
    objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);

    registerSerializerDeserializer(objectMapper);
}

private void registerSerializerDeserializer(ObjectMapper objectMapper) {
    SimpleModule module = new SimpleModule();

    module.addSerializer(LocalDateTime.class, new JsonLocalDateTimeSerializer());
    module.addDeserializer(LocalDateTime.class, new JsonDateTimeDeserializer());

    objectMapper.registerModule(module);
}

}