Scala の HttpClient の使い方 (Post)

次の Java プログラムを scala で書いてみました。
Java の HttpClient の使い方 (Post)

Http_post.scala

// -----------------------------------------------------------------------
/*
    Http_post.scala


                    Jun/12/2021
*/
// -----------------------------------------------------------------------
import java.io.IOException
import java.io.UnsupportedEncodingException
import java.nio.charset.Charset
import java.nio.charset.StandardCharsets
import java.util.ArrayList
import java.util.List
import org.apache.http.HttpStatus
import org.apache.http.NameValuePair
import org.apache.http.client.ClientProtocolException
import org.apache.http.client.entity.UrlEncodedFormEntity
import org.apache.http.client.methods.CloseableHttpResponse
import org.apache.http.client.methods.HttpPost
import org.apache.http.impl.client.CloseableHttpClient
import org.apache.http.impl.client.HttpClients
import org.apache.http.message.BasicNameValuePair
import org.apache.http.util.EntityUtils

// -----------------------------------------------------------------------
object Http_client {

def runSample() = {
    System.err.println ("*** runSample *** start ***")

    var charset = StandardCharsets.UTF_8

    var httpclient = HttpClients.createDefault()

    var request = new HttpPost("https://httpbin.org/post")      
    var requestParams = new java.util.ArrayList[NameValuePair]()
    requestParams.add(new BasicNameValuePair("user","jiro"))
    requestParams.add(new BasicNameValuePair("password","123456"))

    println ("requestの実行　「" + request.getRequestLine() + "」")

    var response:CloseableHttpResponse = null

    try {
        request.setEntity(new UrlEncodedFormEntity(requestParams))
        var response = httpclient.execute(request)

        var status = response.getStatusLine().getStatusCode()
        println("HTTPステータス:" + status)

        if (status == HttpStatus.SC_OK){
            var responseData = EntityUtils.toString(response.getEntity(),charset)
            println(responseData)
            }

        } catch {
            case e: ClientProtocolException => e.printStackTrace()
            case e: UnsupportedEncodingException => e.printStackTrace()
            case e: IOException => e.printStackTrace()

        } finally {

            try {
                if (response != null) {
                    response.close()
                }
                if (httpclient != null) {
                    httpclient.close()
                }
            } catch {
                case e: IOException => e.printStackTrace()
            }
        }

    System.err.println ("*** runSample *** end ***")
    }
}

// -----------------------------------------------------------------------
object Http_post {

def main(args: Array[String]) {
    System.err.println ("*** 開始 ***")

    Http_client.runSample()

    System.err.println ("*** 終了 ***")
    }
}

// -----------------------------------------------------------------------

Makefile

LIB=/usr/share/java
HTTPCLIENT_JAR=.:$(LIB)/httpclient-4.5.13.jar:$(LIB)/httpcore-4.4.14.jar
Http_post.class: Http_post.scala
    scalac -cp $(HTTPCLIENT_JAR) Http_post.scala
clean:
    rm -f *.class

実行コマンド

LIB=/usr/share/java
HTTPCLIENT_JAR=$LIB/httpclient-4.5.13.jar:$LIB/httpcore-4.4.14.jar:$LIB/commons-logging-1.2.jar
export CLASSPATH=.:$HTTPCLIENT_JAR
#
scala Http_post