1、pom.xml中引入依赖包
<dependency>
<groupId>org.json4s</groupId>
<artifactId>json4s-native_2.11</artifactId>
<version>3.2.1</version>
</dependency>
2、scala代码
object a123 {
def main(args: Array[String]): Unit = {
import org.json4s._
import org.json4s.native.JsonMethods._
import org.json4s.JsonDSL._
//对象转化为json
val list=List(Map("a"->1,"b"->2),Map("a"->1,"b"->2))
val json: String = compact(render(list))
println(json)
//json转化为对象（不带外层字段）
implicit val formats = DefaultFormats
case class ClassA(a:Int,b:Int)
val json2="""[{"a":1,"b":2},{"a":1,"b":2}]"""
val bb: List[ClassA] = parse(json2).extract[List[ClassA]]
println(bb.toString)
//json转对象(带外层字段名)
case class ClassC(a:Int,b:Int)
case class ClassB(c:List[ClassC])
val json3="""{"c":[{"a":1,"b":2},{"a":1,"b":2}]}"""
val bb1:ClassB=parse(json3).extract[ClassB]
println(bb)
}
}
