com.ecfront.common.JsonHelper.scala Maven / Gradle / Ivy

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package com.ecfront.common

import com.fasterxml.jackson.databind.node.{ArrayNode, ObjectNode}
import com.fasterxml.jackson.databind.{JsonNode, ObjectMapper}
import com.fasterxml.jackson.module.scala.DefaultScalaModule

/**
 * Scala版本的Json辅助类

 * 使用jackson-module-scala封装
 */
object JsonHelper {

  private val mapper = new ObjectMapper()
  mapper.registerModule(DefaultScalaModule)

  /**
   * object 转 json字符串
   * @param obj object
   * @return json字符串
   */
  def toJsonString(obj: Any): String = {
    mapper.writeValueAsString(obj)
  }

  /**
   * object 转 json
   * @param obj object
   * @return json
   */
  def toJson(obj: Any): JsonNode = {
    obj match {
      case o: String => mapper.readTree(o)
      case _ => mapper.valueToTree(obj)
    }
  }

  /**
   * json或string 转 object
   * @param obj json或string
   * @return object
   */
  def toObject[E](obj: Any, clazz: Class[E]): E = {
    obj match {
      case o: String =>
        clazz match {
          case c if c == classOf[String] =>
            o.asInstanceOf[E]
          case c if c == classOf[Int] =>
            o.toInt.asInstanceOf[E]
          case c if c == classOf[Long] =>
            o.toLong.asInstanceOf[E]
          case c if c == classOf[Double] =>
            o.toDouble.asInstanceOf[E]
          case c if c == classOf[Float] =>
            o.toFloat.asInstanceOf[E]
          case c if c == classOf[Boolean] =>
            o.toBoolean.asInstanceOf[E]
          case c if c == classOf[Byte] =>
            o.toByte.asInstanceOf[E]
          case c if c == classOf[Short] =>
            o.toShort.asInstanceOf[E]
          case c if c == classOf[Void] =>
            null.asInstanceOf[E]
          case _ =>
            mapper.readValue(o, clazz)
        }
      case o: JsonNode => mapper.readValue(o.toString, clazz)
      case _ => mapper.readValue(mapper.writeValueAsString(obj), clazz)
    }
  }

  def createObjectNode(): ObjectNode = {
    mapper.createObjectNode()
  }

  def createArrayNode(): ArrayNode = {
    mapper.createArrayNode()
  }

}