Use the jsch package, SFTP and SSH2 file operations and remote command execution in Java

Sftpconstants. Java, which defines some parameter names we need:

 

public class SFTPConstants {    public static final String SFTP_REQ_HOST = "host";    public static final String SFTP_REQ_PORT = "port";    public static final String SFTP_REQ_USERNAME = "username";    public static final String SFTP_REQ_PASSWORD = "password";    public static final int SFTP_DEFAULT_PORT = 22;    public static final String SFTP_REQ_LOC = "location";}

Sftpchannel. Java we use it to obtain channel objects:

 

 

Import Java. util. map; import Java. util. properties; import Org. apache. log4j. logger; import COM. jcraft. jsch. channel; import COM. jcraft. jsch. jsch; import COM. jcraft. jsch. jschexception; import COM. jcraft. jsch. session; public class sftpchannel {session = NULL; channel = NULL; Private Static final logger log = logger. getlogger (sftpchannel. class); public channel getchannel (string name, Map <strin G, string> sftpdetails, int timeout) throws jschexception {string ftphost = sftpdetails. get (sftpconstants. sftp_req_host); string port = sftpdetails. get (sftpconstants. sftp_req_port); string ftpusername = sftpdetails. get (sftpconstants. sftp_req_username); string ftppassword = sftpdetails. get (sftpconstants. sftp_req_password); int ftpport = sftpconstants. sftp_default_port; If (port! = NULL &&! Port. equals ("") {ftpport = integer. valueof (port);} jsch = new jsch (); // create jsch object session = jsch. getsession (ftpusername, ftphost, ftpport); // obtain a session object log.info ("session created. "); If (ftppassword! = NULL) {session. setpassword (ftppassword); // set the password} properties Config = new properties (); config. put ("stricthostkeychecking", "no"); Session. setconfig (config); // set properties session for the session object. setTimeout (timeout); // sets the timeout time session. connect (); // establish the link log.info ("session connected. "); log.info (" Opening channel. "); Channel = session. openchannel (name); // open the SFTP channel log.info ("connected Su Ccessfully to ftphost = "+ ftphost +", as ftpusername = "+ ftpusername +", returning: "+ channel); return channel;} public void connect () throws jschexception {channel. connect ();} public void closechannel () throws exception {If (Channel! = NULL) {channel. Disconnect ();} If (session! = NULL) {session. Disconnect ();}}

Create a class to monitor the progress of file operations:

 

 

import com.jcraft.jsch.SftpProgressMonitor;public class FileProgressMonitor implements SftpProgressMonitor {    private long transfered;        public FileProgressMonitor()    {    }        @Override    public boolean count(long count) {        transfered = transfered + count;        System.out.println("Currently transferred total size: " + transfered + " bytes");        return true;    }    @Override    public void end() {    System.out.println("Transferring done.");    }    @Override    public void init(int op, String src, String dest, long max) {    System.out.println("Transferring begin.");    }}

Next, let's take a look at file operations:

 

 

Map <string, string> sftpdetails = new hashmap <string, string> (); sftpdetails. put (sftpconstants. sftp_req_host, "192.168.1.17"); sftpdetails. put (sftpconstants. sftp_req_username, "root"); sftpdetails. put (sftpconstants. sftp_req_password, "123456"); sftpdetails. put (sftpconstants. sftp_req_port, "22"); string src = "/home/test.txt"; // target file name string DST = "test/test.txt "; // local file name sftpchannel channel = new sftpchannel (); channelsftp chsftp = NULL; try {chsftp = (channelsftp) channel. getchannel ("SFTP", sftpdetails, 60000); channel. connect (); chsftp. get (SRC, DST, new fileprogressmonitor (), channelsftp. overwrite);} catch (jschexception e) {e. printstacktrace ();} catch (exception e) {e. printstacktrace ();} finally {chsftp. quit (); channel. closechannel ();}

Run the following remote command:

 

 

String charset = "UTF-8";String cmd = "ls";Map<String, String> sftpDetails = new HashMap<String, String>();sftpDetails.put(SFTPConstants.SFTP_REQ_HOST, "192.168.1.17");sftpDetails.put(SFTPConstants.SFTP_REQ_USERNAME, "root");sftpDetails.put(SFTPConstants.SFTP_REQ_PASSWORD, "123456");sftpDetails.put(SFTPConstants.SFTP_REQ_PORT, "22");SFTPChannel channel = new SFTPChannel();ChannelExec execChannel = null;execChannel = (ChannelExec)channel.getChannel("exec", sftpDetails, 60000);execChannel.setCommand(cmd);execChannel.setInputStream(null);execChannel.setErrStream(System.err);execChannel.connect();InputStream in = execChannel.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in, Charset.forName(charset)));String buf = null;while ((buf = reader.readLine()) != null){//System.out.println(buf);}reader.close();try {channel.closeChannel();} catch (Exception e) {e.printStackTrace();}

After testing, jsch is still very stable and suitable for use in projects. This tool is used for file operations and remote command execution between machines.