scala class、Map、List 转换成Json（Gson、json4s、JSONUtil）

实例代码

import cn.hutool.json.JSONUtil
import com.google.gson.Gson


object EntitytoJsonTest {

  def main(args: Array[String]): Unit = {
    val gson = new Gson
    val people = JJ("gl", 12, List("basketball", "baseball"),
      Map("k1" -> "v1", "k2" -> "v2"))

    println("gson======================")

    val jsonStr = gson.toJson(people)
    println(jsonStr)

    println(gson.toJson(List("123","234","455")))
    println(gson.toJson(List("123","234","455")))
    println(gson.toJson(Map("k1" -> "v1", "k2" -> "v2")))

    println("json4s======================")
    import org.json4s._
    import org.json4s.jackson.Serialization._
    import org.json4s.jackson.Serialization

    implicit val formats = Serialization.formats(NoTypeHints)
    val m = Map(
      "name" -> "john doe",
      "age" -> 18,
      "hasChild" -> true,
      "childs" -> List(
        Map("name" -> "dorothy", "age" -> 5, "hasChild" -> false),
        Map("name" -> "bill", "age" -> 8, "hasChild" -> false)))

    val s:String = write(m)
    println(s)

    val s1 = write(people)
    println(s1)

    println("JSONUtil======================")

    println(JSONUtil.toJsonStr(people))
    println(JSONUtil.toJsonPrettyStr(s1))
  }
}

case class JJ(var name: String, var age: Int, var hobbies: List[String]
              , var skills: Map[String, String])

运行结果

gson======================
{"name":"gl","age":12,"hobbies":{},"skills":{}}
{"head":"123","tl":{}}
{"head":"123","tl":{}}
{"key1":"k1","value1":"v1","key2":"k2","value2":"v2"}
json4s======================
{"name":"john doe","age":18,"hasChild":true,"childs":[{"name":"dorothy","age":5,"hasChild":false},{"name":"bill","age":8,"hasChild":false}]}
{"name":"gl","age":12,"hobbies":["basketball","baseball"],"skills":{"k1":"v1","k2":"v2"}}
JSONUtil======================
{}