【JSch】リモートFTPサーバー内でファイルをコピーするサンプル。

stackoverflowの下記の記事を参考にさせていただきました。
https://stackoverflow.com/questions/19869446/copy-a-file-on-remote-server-from-one-directory-to-other-using-jsch/25686815

JSchSample.java

package hello;

import java.io.InputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpProgressMonitor;

@SpringBootApplication
public class Application {

    private static final Logger log = LoggerFactory.getLogger(Application.class);

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

    @Bean
    public CommandLineRunner demo() {
        return (args) -> {
            log.info("JSch Start");

        };
    }


    public void cp (String source, String target) throws Exception {
        log.info("COMMAND: cp " + source + " " + target);

        String host = "172.20.10.2";
        int port = 22;
        String user = "user";
        String password = "パスワード";

        JSch jsch;
        Session session = null;
        Channel upChannel = null;
        Channel downChannel = null;
        ChannelSftp uploadChannelSftp = null;
        ChannelSftp downloadChannelSftp = null;
        try {
            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();        

            upChannel = session.openChannel("sftp");
            downChannel = session.openChannel("sftp");
            upChannel.connect();
            downChannel.connect();
            uploadChannelSftp = (ChannelSftp) upChannel;
            downloadChannelSftp = (ChannelSftp) downChannel;
            SftpProgressMonitor monitor = null; //???
            InputStream inputStream = uploadChannelSftp.get(source);

            downloadChannelSftp.put(inputStream, target, monitor);
        } catch (JSchException e) {
            log.error("Auth failure", e);
            throw new Exception(e);
        } finally {
            if (upChannel == null || downChannel == null) {
                System.out.println("Channel is null ...");
            }else if (uploadChannelSftp != null && !uploadChannelSftp.isClosed()){
                uploadChannelSftp.exit();
                downloadChannelSftp.exit();
                uploadChannelSftp.disconnect();
                downloadChannelSftp.disconnect();
            }else if (!upChannel.isClosed()) {
                upChannel.disconnect();
                downChannel.disconnect();
            }
            session.disconnect();
        }
    }
}