Java program to upload/download files from remote server

FTPExample.java

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;

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;

public class FTPExample {
	
	private String host;
	private Integer port;
	private String user;
	private String password;
	
	private JSch jsch;
	private Session session;
	private Channel channel;
	private ChannelSftp sftpChannel;
	
	public FTPExample(String host, Integer port, String user, String password) {
		this.host = host;
		this.port = port;
		this.user = user;
		this.password = password;
	}

	public void connect() {
		
		System.out.println("connecting..."+host);
		try {
			jsch = new JSch();
			session = jsch.getSession(user, host,port);
			session.setConfig("StrictHostKeyChecking", "no");
			session.setPassword(password);
			session.connect();

			channel = session.openChannel("sftp");
			channel.connect();
			sftpChannel = (ChannelSftp) channel;

		} catch (JSchException e) {
			e.printStackTrace();
		}

	}
	
	public void disconnect() {
		System.out.println("disconnecting...");
		sftpChannel.disconnect();
		channel.disconnect();
		session.disconnect();
	}
	
	public void upload(String fileName, String remoteDir) {

		FileInputStream fis = null;
		connect();
		try {
			// Change to output directory
			sftpChannel.cd(remoteDir);

			// Upload file
			File file = new File(fileName);
			fis = new FileInputStream(file);
			sftpChannel.put(fis, file.getName());

			fis.close();
			System.out.println("File uploaded successfully - "+ file.getAbsolutePath());

		} catch (Exception e) {
			e.printStackTrace();
		}
		disconnect();
	}
	
	public void download(String fileName, String localDir) {

		byte[] buffer = new byte[1024];
		BufferedInputStream bis;
		connect();
		try {
			// Change to output directory
			String cdDir = fileName.substring(0, fileName.lastIndexOf("/") + 1);
			sftpChannel.cd(cdDir);

			File file = new File(fileName);
			bis = new BufferedInputStream(sftpChannel.get(file.getName()));

			File newFile = new File(localDir + "/" + file.getName());
			
			// Download file
			OutputStream os = new FileOutputStream(newFile);
			BufferedOutputStream bos = new BufferedOutputStream(os);
			int readCount;
			while ((readCount = bis.read(buffer)) > 0) {
				bos.write(buffer, 0, readCount);
			}
			bis.close();
			bos.close();
			System.out.println("File downloaded successfully - "+ file.getAbsolutePath());

		} catch (Exception e) {
			e.printStackTrace();
		}
		disconnect();
	}

	public static void main(String[] args) {
		
		
		String localPath = "C:/temp/";
		String remotePath = "/export/home/madan/";
		
		FTPExample ftp = new FTPExample("10.100.12.14", 2222, "madan", "password");
		
		ftp.upload(localPath+"filetoupload.txt", remotePath);
		
		ftp.download(remotePath+"filetodownload.txt", localPath);

	}

}

Hi, I am sending request from client through HTML page. Variable “SerFC” gives complete file path. But the issue is the local path, as jar is running on server. Hope it is clear. Please let me know. Kiran Thimmegowda Sent from my iPhone

…

On 11-Jun-2019, at 12:46 AM, Madan Chaudhary ***@***.***> wrote: Hi, I am new to programming & recently started working on an app development using java. Purpose of the app is to process some api & output information in the form of excel file. JAR is located at server and runs when user send request at client(local machine). The app generates excel file successfully but at the server location. I tried to use the above approach to download from server to my local machine(client location) but it creates a new file at JAR location(i.e at Server location) instead of client location. The code snippet is as below & this creates a file at JAR location with file name C:\Users\PFName-CFName_Co.xlsx Please check & help me on how to download the file to client location(anywhere in c drive) String SerDir=System.getProperty("user.home") + "/Desktop/"; String LocDir="C:\Users"; String SerFC = SerDir+PFName+"-"+CFName+"_Co.xlsx"; String LocFC = LocDir+PFName+"-"+CFName+"_Cos.xlsx"; Session session = null; ChannelSftp sftpChannel=null; Channel channel = null; JSch jsch = new JSch(); try { session = jsch.getSession(username, hostname, 22); session.setConfig("StrictHostKeyChecking","no"); session.setPassword(password); Properties config = new Properties(); config.put("StrictHostKeyChecking", "no"); session.setConfig(config); session.connect(); channel = session.openChannel("sftp"); channel.connect(); sftpChannel =(ChannelSftp) channel; sftpChannel.cd(SerDir); File file = new File(SerFC); byte[] buffer = new byte[1024]; BufferedInputStream bis; bis = new BufferedInputStream(sftpChannel.get(file.getName())); File newFile = new File(LocDir + file.getName()); // Download file OutputStream os = new FileOutputStream(newFile); BufferedOutputStream bos = new BufferedOutputStream(os); int readCount; while ((readCount = bis.read(buffer)) > 0) { bos.write(buffer, 0, readCount); } bis.close(); bos.close(); Do u got the solution? Question - How you are sending the request from client to server. If you know the file path from server in your client code then you can u above download code to retrieve the file. — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

Thanks, It worked for me

can you suggest me what are the jar files required for this code

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