Scala JsonToken类代码示例

//设置package包名称以及导入依赖的类
package la.dp.sitemap

import java.io.InputStream

import com.fasterxml.jackson.core.JsonToken
import com.fasterxml.jackson.core.JsonToken._
import com.fasterxml.jackson.databind.{JsonNode, ObjectMapper}


class DplaJsonTraversable(inputStream: InputStream) extends Traversable[JsonNode] {

  override def hasDefiniteSize = false

  override def foreach[U](f: (JsonNode) => U): Unit = {

    try {
      val parser = DplaJsonTraversable.jsonFactory.createParser(inputStream)
      assume(parser.nextToken() == JsonToken.START_ARRAY)

      while (parser.nextToken() != END_ARRAY) {
        if (parser.currentToken() == START_OBJECT) {
          val node = parser.readValueAsTree[JsonNode]
          f(node)
        }
      }

    } finally {
      inputStream.close()
    }
  }

  override def toString(): String = "DplaJsonTraversable: " + inputStream.toString
}

object DplaJsonTraversable {
  private val objectMapper = new ObjectMapper()
  private val jsonFactory = objectMapper.getFactory
} 

//设置package包名称以及导入依赖的类
package la.dp.sitemap

import com.fasterxml.jackson.core.JsonToken

class DplaJsonTraversableTest extends SitemapSpec {

  "A DplaJsonTraversable" should "find all the objects in a DPLA JSON file" in {
    assert(new DplaJsonTraversable(someDotJson).size == 49)
  }

  it should "present the caller with a stream of JSON objects containing DPLA metadata" in {
    new DplaJsonTraversable(someDotJson).foreach(
      obj => {
        assert(obj.asToken() == JsonToken.START_OBJECT)
        List(obj.get("_id"), obj.get("_type"), obj.get("_index")).foreach( value => {
          assert(value.asToken() != JsonToken.VALUE_NULL)
        })
      })
  }
} 

//设置package包名称以及导入依赖的类
package cjp.catalogue.conf

import com.fasterxml.jackson.databind.module.SimpleModule
import com.fasterxml.jackson.core.{JsonToken, JsonParseException, JsonParser}
import com.fasterxml.jackson.databind.{DeserializationContext}
import com.fasterxml.jackson.databind.deser.std.StdScalarDeserializer
import scala.util.{Failure, Success, Try}

class CustomBigDecimalDeserialiserModule extends SimpleModule("CustomBigDecimalDeserialiserModule") {
  addDeserializer(classOf[BigDecimal], BigDecimalDeserializer)
}

object BigDecimalDeserializer extends StdScalarDeserializer[BigDecimal](classOf[BigDecimal]) {

  override def deserialize(jsonParser: JsonParser, context: DeserializationContext): BigDecimal = {
    Option(jsonParser.getValueAsString) match {
      case Some(str: String) => Try(BigDecimal(str)) match {
        case Success(value) => value
        case Failure(error) => throw new JsonParseException(s"Unable to parse ${str} to BigDecimal", jsonParser.getCurrentLocation, error)
      }
      case None if jsonParser.getCurrentToken == JsonToken.VALUE_NULL => null.asInstanceOf[BigDecimal]
      case _ => throw new JsonParseException(s"Expected a string token representing type 'BigDecimal', found: ${jsonParser.getCurrentToken}", jsonParser.getCurrentLocation)
    }
  }
} 

//设置package包名称以及导入依赖的类
package com.hypertino.binders.json

import com.fasterxml.jackson.core.JsonToken
import com.hypertino.binders.core.BindOptions
import com.hypertino.binders.json.api._

class JacksonParserAdapter(jacksonParser: com.fasterxml.jackson.core.JsonParser)
                          (implicit protected val bindOptions: BindOptions) extends JsonParserApi {
  override def currentToken: JsToken = convertToken(jacksonParser.getCurrentToken)
  override def nextToken(): JsToken = convertToken(jacksonParser.nextToken())

  override def fieldName: Option[String] = Option(jacksonParser.getCurrentName)

  override def stringValue: String = jacksonParser.getValueAsString

  override def numberValue: BigDecimal = jacksonParser.getDecimalValue

  private def convertToken(token: JsonToken): JsToken = {
    token match {
      case JsonToken.START_OBJECT ? JsStartObject
      case JsonToken.END_OBJECT ? JsEndObject
      case JsonToken.START_ARRAY ? JsStartArray
      case JsonToken.END_ARRAY ? JsEndArray
      case JsonToken.FIELD_NAME ? JsFieldName
      case JsonToken.VALUE_STRING ? JsString
      case JsonToken.VALUE_NUMBER_FLOAT ? JsNumber
      case JsonToken.VALUE_NUMBER_INT ? JsNumber
      case JsonToken.VALUE_TRUE ? JsTrue
      case JsonToken.VALUE_FALSE ? JsFalse
      case JsonToken.VALUE_NULL ? JsNull
      case _ ? JsUnknown
    }
  }

  override def location: String = jacksonParser.getCurrentLocation.toString
}