gson-scala

A scala wrapper for Gson

Features:

• Scala List support
• Scala Option support
• Generic parsing (without mapping to a class)

Converting Objects to JSON

case class TestRecord(val a: String, val b: String, val c: Option[String], val d: List[String])

val testRecord = new TestRecord("x", "y", Option("z"), List("1", "2", "3"))
Json.toJson(testRecord)

creates the following JSON string:

{"a":"x","b":"y","c":"z","d":["1","2","3"]}

Note that pretty-printing vs compact printing is available among many other features supported by Gson via Json.gsonInstance variable.

Parsing Objects from JSON

case class TestRecord(val a: String, val b: String, val c: Option[String], val d: List[String])

val testRecordAsJson = """{"a":"x","b":"y","c":"z","d":["1","2","3"]}"""
val parsedObject = Json.fromJson(testRecordAsJson, classOf[TestRecord])

Generic JSON parsing (without mapping to )

val testInput = """{ "a":"1", "b":"2013-11-12T08:00:00.000Z", "c":"dsfsfddsf"}"""
val parsedJson = Json.parse(testInput)

At this point you can access fields via accessors:

    assert(parsedJson("a").reqStr === "1")
    assert(parsedJson("b").date.map(_.getYear()).get === 2013)
    assert(parsedJson("non-existing").date.map(_.getYear()) === None)
    assert(parsedJson("non-existing").str === None)

Generic parsing features

• Accessing attributes json("attr")
• Accessing nested attrbiutes json("attr")("nestedattr")
• Optional attribute support: almost all methods return Optionals ('json("attr").str' gives Option[String], etc.)
• Date parsing support (ZonedDateTime)