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Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.
There are a few open-source projects that can convert Java objects to JSON. However, most of them require that you place Java annotations in your classes; something that you can not do if you do not have access to the source-code. Most also do not fully support the use of Java Generics. Gson considers both of these as very important design goals.
– Provide simple
fromJson() methods to convert Java objects to JSON and vice-versa
– Allow pre-existing unmodifiable objects to be converted to and from JSON
– Extensive support of Java Generics
– Allow custom representations for objects
– Support arbitrarily complex objects (with deep inheritance hierarchies and extensive use of generic types)
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