java - How do you upload a file to an FTP server?

import java.io.File;
import java.io.FileNotFoundException;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.Selectors;
import org.apache.commons.vfs2.impl.StandardFileSystemManager;
import org.apache.commons.vfs2.provider.sftp.SftpFileSystemConfigBuilder;

public void onUpload()
{
	String hostName = "xxxxxxx";
	String username = "xxxxxxx";
	String password = "xxxxxxx";
	String ftpfolder = "outbound";

	String fileName ="YourLocalFileName";
	String remoteFilePath = "/" + ftpfolder + "/" + fileName;
	String localFilePath = "YourLocalFilePath";
	File file = new File(localFilePath);
	if (!file.exists())
	throw new RuntimeException("Error. Local file not found");

	StandardFileSystemManager manager = new StandardFileSystemManager();
	try {
		manager.init();

		// Create local file object
		FileObject localFile = manager.resolveFile(file.getAbsolutePath());

		// Create SFTP options
		FileSystemOptions opts = new FileSystemOptions();

		// SSH Key checking
		SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(
				opts, "no");
		// Root directory set to user home
		SftpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(opts,
				false);

		// Timeout is count by Milliseconds
		SftpFileSystemConfigBuilder.getInstance().setTimeout(opts, 10000);

		// Create remote file object
		FileObject remoteFile = manager.resolveFile(
				createConnectionString(hostName, username, password,
						remoteFilePath), opts);

		// Copy local file to sftp server
		remoteFile.copyFrom(localFile, Selectors.SELECT_SELF);
		System.out.println("Done");
		} catch (Exception e) {
			//Catch and Show the exception
		} finally {
			manager.close();
			win.detach();
		}
}
	
	
public static String createConnectionString(String hostName,
		String username, String password, String remoteFilePath) {
		return "sftp://" + username + ":" + password + "@" + hostName + "/"
	+ remoteFilePath;
}

Maven artifacts for Apache VFS is a Virtual File System library.

<dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-vfs2</artifactId>
	<version>2.0</version>
</dependency>