用Jackson和Spring序列化Joda DateTime [英] Serializing Joda DateTime with Jackson and Spring

问题描述

我遇到问题，一直使用Spring Boot和Jackson-databind 2.5.2将Joda DateTime从java序列化和反序列化为json，然后再将其反序列化。我的pom.xml看起来像这样。

I am having problems consistently serializing and deserializing a Joda DateTime from java to json and back again using Spring Boot and Jackson-databind 2.5.2. My pom.xml looks like this.

    <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.2</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-joda</artifactId>
    <version>2.5.2</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>1.2.1.RELEASE</version>
</dependency>

当我序列化DateTime对象时，我得到一个表示DateTime的整数。不是我的预期，但很好。但是当我去保存我的对象时，我得到以下错误...

When I serialize the DateTime object I get an integer representing the DateTime. Not what I expected actually, but fine. BUT when I go to save my object back I get the following error...

Failed to convert property value of type 'java.lang.String' to required type 'org.joda.time.DateTime' for property 'endTime';
nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String to type org.joda.time.DateTime for value '1428600998511'

由于某种原因，它将序列化为一个整数，然后将其反序列化，就像它是一个字符串一样，但它不是。我还尝试在调用其余服务之前设置endTime = new Date（intValue），并且尝试将字符串转换为'Tue Apr 28 2015 00:00:00 GMT-0700（PDT）'到DateTime也失败了。

For some reason it is serializing it to an integer but then deserializing it as if it's a string, which it is not. I also tried setting the endTime = new Date(intValue) before calling the rest service and that also failed trying to convert a string like 'Tue Apr 28 2015 00:00:00 GMT-0700 (PDT)' to a DateTime.

我做错了什么？

更新：

以下是我尝试立即POST的和的JSON。

Here is the JSON that I GET and that I try to immediately POST right back.

{
    id: 4,
    username: "",
    name: "eau",
    email: "aoue",
    verbatimLocation: null,
    latitude: null,
    longitude: null,
    startTime:null,
    endTime: 1429034332312,
    description: "ueoa",
    media: [ ],
    timeSubmitted: 1428600998000,
    status: null,
    submissionid: null
}

推荐答案

对于更可重用的机制，您可以创建一个 JsonSerializer ：

For a more re-usable mechanism, you can create a JsonSerializer:

/**
 * When passing JSON around, it's good to use a standard text representation of
 * the date, rather than the full details of a Joda DateTime object. Therefore,
 * this will serialize the value to the ISO-8601 standard:
 * <pre>yyyy-MM-dd'T'HH:mm:ss.SSSZ</pre>
 * This can then be parsed by a JavaScript library such as moment.js.
 */
public class JsonJodaDateTimeSerializer extends JsonSerializer<DateTime> {

    private static DateTimeFormatter formatter = ISODateTimeFormat.dateTime();

    @Override
    public void serialize(DateTime value, JsonGenerator gen, SerializerProvider arg2)
            throws IOException, JsonProcessingException {

        gen.writeString(formatter.print(value));
    }

}

然后你可以注释你的 get 方法：

Then you can annotate your get methods with:

@JsonSerialize(using = JsonJodaDateTimeSerializer.class)

这使您可以在整个应用程序中保持一致的格式，而无需在任何地方重复文本模式。这也是时区意识。

This gives you consistent formatting throughout your application, without repeating text patterns everywhere. It's also timezone aware.

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