Is there a jackson datatype module for JDK8 java.time?

问题

I\'m looking for a module for the new JDK8 java.time classes. I have looked through the FasterXML GitHub Project Listing and presently found none.

As I understand Jackson is still being compiled against JDK6 so can not use these classes directly and must have this built as a separate module, as was required with Joda.

I don\'t mind starting the project, though looking to see if any other efforts were already underway.

回答1:

As already mentioned, Jackson-Datatype-JSR310 provides support for Java 8 Time.

Since Jackson 2.6.0 the "old" JSR310Module is deprecated. It is replaced by JavaTimeModule. Maven dependency is the same (you can find the current version in Maven Central):

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.6.0</version>
</dependency>

You have to register the module like this:

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

Note that as of 2.6, this module does NOT support auto-registration, because of existence of legacy version, JSR310Module. Legacy version has the same functionality, but slightly different default configuration: see com.fasterxml.jackson.datatype.jsr310.JSR310Module for details.

JavaTimeModule Source at GitHub

JavaTimeModule Usage

回答2:

The most complete listing of datatype modules would be found from Jackson "portal" page at Github:

https://github.com/FasterXML/jackson

which does list "JSR-310: support for "Java 8 Dates". Naming is bit opaque, but it refers to the standardization process, via JSR that should be finalized to produce the new Java8 Date API (if it's not already final; process has taken a while).

Direct link is: https://github.com/FasterXML/jackson-datatype-jsr310

回答3:

You just need to import the jsr310 module.

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.5.0</version>
</dependency>

If module auto scan is not enable in your project, you will need to register it:

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JSR310Module());

回答4:

My bad, I was looking for a jackson-datatype-jdk8 as was for jackson-datatype-jdk7, however the project was actually created under the JSR name jackson-datatype-jsr310.

回答5:

If you use Spring Boot 2 and depends on the spring-boot-starter-web starter, you would have as dependencies both : the deprecated (jackson-datatype-jsr310) and the actual (jackson-datatype-jdk8).

[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:2.0.0.M3:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-json:jar:2.0.0.M3:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.9.0.pr4:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.9.0.pr4:compile

回答6:

You should be able to use

ObjectMapper mapper = new ObjectMapper();
mapper.findAndRegisterModules();

来源：https://stackoverflow.com/questions/21384820/is-there-a-jackson-datatype-module-for-jdk8-java-time

标签

jackson

java-8

java-time

jackson-modules