T Tak, Author at Java Code Gists

Convert byte to Hexadecimal String and vice versa

May 7, 2017December 24, 2016 by T Tak

Convert byte to Hexadecimal

 public static String bytesToHex(byte[] bytes) {
    final char[] hexArray = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
    char[] hexChars = new char[bytes.length * 2];
    int v;
    for (int j = 0; j &lt; bytes.length; j++) {
        v = bytes[j] &amp; 0xFF;
        hexChars[j * 2] = hexArray[v &gt;&gt;&gt; 4];
        hexChars[j * 2 + 1] = hexArray[v &amp; 0x0F];
    }
    return new String(hexChars);
    }

public static String bytesToHex(byte[] bytes) {

final char[] hexArray = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

char[] hexChars = new char[bytes.length * 2];

int v;

for (int j = 0; j < bytes.length; j++) {

v = bytes[j] & 0xFF;

hexChars[j * 2] = hexArray[v >>> 4];

hexChars[j * 2 + 1] = hexArray[v & 0x0F];

}

return new String(hexChars);

}

Convert Hexadecimal to byte

public static byte[] hexToBytes(String s) {
    int len = s.length();
    byte[] data = new byte[len / 2];
    for (int i = 0; i &lt; len; i += 2) {
        data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) &lt;&lt; 4) + Character.digit(s.charAt(i + 1), 16));
    }
    return data;
    }

public static byte[] hexToBytes(String s) {

int len = s.length();

byte[] data = new byte[len / 2];

for (int i = 0; i < len; i += 2) {

data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));

}

return data;

}

How to download and Upload a file through SFTP using java.

May 7, 2017December 23, 2016 by T Tak

Here is a code example that shows how to download and upload a file through SFTP in java Download File

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.SftpException;
/**
 * 
 * @author javagists.com
 *
 */
public class DownloadFileSFTP {
 
    public static void main(String[] args) throws Exception {

 JSch jsch = new JSch();
        Session session = null;
        try {
           session = jsch.getSession("admin", "127.0.0.1", 22);
            session.setConfig("StrictHostKeyChecking", "no");
            session.setPassword("pass");
            session.connect();
            
            Channel channel = session.openChannel("sftp");
            channel.connect();
            ChannelSftp sftpChannel = (ChannelSftp) channel;
            sftpChannel.get("/tmpremote/testDownload.txt", "/tmplocal/testDownload.txt");  
            sftpChannel.exit();
            session.disconnect();
        } catch (JSchException e) {
            e.printStackTrace();  
        } catch (SftpException e) {
            e.printStackTrace();
        }

   }

}

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.SftpException;

/**

* @author javagists.com

public class DownloadFileSFTP {

public static void main(String[] args) throws Exception {

JSch jsch = new JSch();

Session session = null;

try {

session = jsch.getSession("admin", "127.0.0.1", 22);

session.setConfig("StrictHostKeyChecking", "no");

session.setPassword("pass");

session.connect();

Channel channel = session.openChannel("sftp");

channel.connect();

ChannelSftp sftpChannel = (ChannelSftp) channel;

sftpChannel.get("/tmpremote/testDownload.txt", "/tmplocal/testDownload.txt");

sftpChannel.exit();

session.disconnect();

} catch (JSchException e) {

e.printStackTrace();

} catch (SftpException e) {

e.printStackTrace();

}

Upload File

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.SftpException;
/**
 * 
 * @author javagists.com
 *
 */
public class UploadFileSFTP {
 
 public static void main(String[] args) throws Exception {

  JSch jsch = new JSch();
        Session session = null;
        try {
            session = jsch.getSession("admin", "127.0.0.1", 22);
            session.setConfig("StrictHostKeyChecking", "no");
            session.setPassword("pass");
            session.connect();
            
            Channel channel = session.openChannel("sftp");
            channel.connect();
            ChannelSftp sftpChannel = (ChannelSftp) channel;
            sftpChannel.put("/tmplocal/testUpload.txt", "/tmpremote/testUpload.txt");  
            sftpChannel.exit();
            session.disconnect();
        } catch (JSchException e) {
            e.printStackTrace();  
        } catch (SftpException e) {
            e.printStackTrace();
        }

 }

}

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.SftpException;

/**

* @author javagists.com

public class UploadFileSFTP {

public static void main(String[] args) throws Exception {

JSch jsch = new JSch();

Session session = null;

try {

session = jsch.getSession("admin", "127.0.0.1", 22);

session.setConfig("StrictHostKeyChecking", "no");

session.setPassword("pass");

session.connect();

Channel channel = session.openChannel("sftp");

channel.connect();

ChannelSftp sftpChannel = (ChannelSftp) channel;

sftpChannel.put("/tmplocal/testUpload.txt", "/tmpremote/testUpload.txt");

sftpChannel.exit();

session.disconnect();

} catch (JSchException e) {

e.printStackTrace();

} catch (SftpException e) {

e.printStackTrace();

}