转自： https://github.com/FasterXML/jackson
重要的是： jackson 支持 第三方数据类型 jsonobject jsonarray( json.org/java)
如下所说：
Active Jackson projects
Most projects listed below are lead by Jackson development team; but some by other at-large Jackson community members. We try to keep versioning of modules compatible to reduce confusion regarding which versions work together.
Core modules
Core modules are the foundation on which extensions (modules) build upon. These are three and they are known as:
- Streaming (docs) ("jackson-core") defines low-level streaming API, and includes JSON-specific implementations
- Annotations (docs) ("jackson-annotations") contains standard Jackson annotations
- Databind (docs) ("jackson-databind") implements data-binding (and object serialization) support on
streamingpackage; it depends both onstreamingandannotationspackages
Third-party datatype modules
These extensions are plug-in Jackson Modules (registered with ObjectMapper.registerModule()), and add support for datatypes of various commonly used Java libraries, by adding serializers and deserializers so that Jackson databind package (ObjectMapper / ObjectReader / ObjectWriter) can read and write these types.
- Guava: support for many of Guava datatypes.
- Hibernate: support for Hibernate features (lazy-loading, proxies)
- HPPC: support for High-Performance Primitive Containers containers
- Joda: support for types of Joda date/time library datatypes
- JDK7: support for JDK 7 data types not included in previous versions
- JDK8: support for JDK 8 data types not included in previous versions, including
Optional(but excluding new Date types which are in JSR-310 module above) - JSR-310: support for "Java 8 Dates" (ones added in JDK 8)
- Also, for pre-Java8 users can use "ThreeTen" module for backport on Java7
- JSR-353: support for "Java JSON API" types (specifically, its tree model objects)
- org.json: support for "org.json JSON lib" types like
JSONObject,JSONArray - Yandex Bolts support for reading/writing types defined by Yandex Bolts collection types (Functional Programming inspired immutable collections)