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Java SSHでコマンド実行(known_hosts不要)

Last updated at Posted at 2016-02-07

はじめに

事前に以下のライブラリを用意します。

実装例

サンプルでは、動作確認しやすいようにmainメソッドで実行できるようにしてあります。

SSHTest.java
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

/**
 *
 * @author tool-taro.com
 */
public class SSHTest {

	public static void main(String[] args) throws JSchException, SftpException, FileNotFoundException, IOException {

		//サーバ
		String host = "ホスト名";
		//ポート
		int port = 22;
		//ユーザ
		String user = "ユーザ";
		//パスワード
		String password = "パスワード";
		//コマンド
		String command = "date";

		JSch jsch;
		Session session = null;
		ChannelExec channel = null;
		BufferedInputStream bin = null;

		try {
			//接続
			jsch = new JSch();
			session = jsch.getSession(user, host, port);
			//known_hostsのチェックをスキップ
			session.setConfig("StrictHostKeyChecking", "no");
			session.setPassword(password);
			session.connect();

			channel = (ChannelExec) session.openChannel("exec");
			channel.setCommand(command);
			channel.connect();

			//コマンド実行
			bin = new BufferedInputStream(channel.getInputStream());
			ByteArrayOutputStream bout = new ByteArrayOutputStream();
			byte[] buf = new byte[1024];
			int length;
			while (true) {
				length = bin.read(buf);
				if (length == -1) {
					break;
				}
				bout.write(buf, 0, length);
			}
			//標準出力
			System.out.format("実行結果=%1$s", new String(bout.toByteArray(), StandardCharsets.UTF_8));
		}
		finally {
			if (bin != null) {
				try {
					bin.close();
				}
				catch (IOException e) {
				}
			}
			if (channel != null) {
				try {
					channel.disconnect();
				}
				catch (Exception e) {
				}
			}
			if (session != null) {
				try {
					session.disconnect();
				}
				catch (Exception e) {
				}
			}
		}
	}
}

動作確認

$ javac SSHTest.java
$ java SSHTest
$ 実行結果=Mon Feb  8 01:26:47 JST 2016

環境

  • 開発

    • Windows 10 Pro
    • JDK 1.8.0_112
    • NetBeans IDE 8.2
  • 動作検証

    • CentOS Linux release 7.2
    • JDK 1.8.0_112

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