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If you want to read a file from an SFTP server in Java, especially when the filename includes today's date, the JSch library is a reliable tool. Here's how to connect, read, and print file contents, with or without a date in the filename.

✅ Example 1: Basic File Read from SFTP

java

import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Properties;

public class SFTPReadExample {
    public static void main(String[] args) {
        String host = "sftp.example.com";
        String user = "username";
        String password = "password";
        int port = 22;
        String remoteFilePath = "/path/to/remote/file.txt";

        Session session = null;
        ChannelSftp channelSftp = null;

        try {
            JSch jsch = new JSch();
            session = jsch.getSession(user, host, port);
            session.setPassword(password);

            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            session.connect();

            channelSftp = (ChannelSftp) session.openChannel("sftp");
            channelSftp.connect();

            InputStream inputStream = channelSftp.get(remoteFilePath);
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            inputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (channelSftp != null && channelSftp.isConnected()) channelSftp.disconnect();
            if (session != null && session.isConnected()) session.disconnect();
        }
    }
}

✅ Example 2: Read SFTP File with Today’s Date in Filename

java

import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

public class SFTPReadWithDateExample {
    public static void main(String[] args) {
        String host = "sftp.example.com";
        String user = "username";
        String password = "password";
        int port = 22;

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String todayDate = dateFormat.format(new Date());
        String remoteFilePath = "/path/to/remote/file_" + todayDate + ".txt";

        Session session = null;
        ChannelSftp channelSftp = null;

        try {
            JSch jsch = new JSch();
            session = jsch.getSession(user, host, port);
            session.setPassword(password);

            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            session.connect();

            channelSftp = (ChannelSftp) session.openChannel("sftp");
            channelSftp.connect();

            InputStream inputStream = channelSftp.get(remoteFilePath);
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            inputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (channelSftp != null && channelSftp.isConnected()) channelSftp.disconnect();
            if (session != null && session.isConnected()) session.disconnect();
        }
    }
}

🧠 Key Concepts:

• channelSftp.get(remoteFilePath) – Retrieves the file as an InputStream.
• SimpleDateFormat – Used to dynamically generate filenames based on today’s date.
• BufferedReader – Efficiently reads file line by line.
• Dynamic Paths – Great for daily logs or timestamped reports.

⚠️ Tips:

• Ensure the file path and date format match your SFTP naming convention.
• Add a check for FileNotFoundException in case the file for today's date doesn’t exist.
• For large files, consider processing the stream instead of printing.