scala - 无法访问类TransportClient中的构造方法TransportClient

我编写了以下用于在ElasticSearch中建立文档索引的类:

import java.net.InetAddress
import com.typesafe.config.ConfigFactory
import org.elasticsearch.client.transport.TransportClient
import org.elasticsearch.common.settings.Settings
import org.elasticsearch.common.transport.InetSocketTransportAddress
import play.api.libs.json.{JsString, JsValue}

/**
  * Created by liana on 12/07/16.
  */
class ElasticSearchConnector {

  private var transportClient: TransportClient = null
  private val host = "localhost"
  private val port = 9300
  private val cluster = "elasticsearch"
  private val indexName = "tests"
  private val docType = "test"

  def configElasticSearch(): Unit =
  {
    val settings = Settings.settingsBuilder().put("cluster.name", cluster).build()
    transportClient = new TransportClient(settings)
    transportClient.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), port.toInt))
  }

  def putText(json: String, id: Int): String =
  {
    val response = transportClient.prepareIndex(indexName, docType, id)
                                  .setSource(json)
                                  .get()
    val responseId = response.getId
    responseId
  }
}

然后我按如下方式使用它:

val json = """val jsonString =
{
"title": "Elastic",
"price": 2000,
"author":{
"first": "Zachary",
"last": "Tong";
}
}"""

val ec = new ElasticSearchConnector()
ec.configElasticSearch()
val id = ec.putText(json)
System.out.println(id)

这是我收到的错误消息:



怎么了

最佳答案

在Elasticsearch Connector API中，TransportClient类没有公共(public)构造函数，但是有一个声明的私有(private)构造函数。因此，您不能直接“新建” TransportClient的实例。该API大量利用了Builder Pattern，因此，为了创建TransportClient的实例，您需要执行以下操作:

val settings = Settings.settingsBuilder().put("cluster.name", cluster).build()
val transportClient = TransportClient.builder().settings(settings).build()
transportClient.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), port.toInt))

关于scala - 无法访问类TransportClient中的构造方法TransportClient，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38327177/