Java Requires Chilkat v11.0.0+

Transfer a File using Sockets (TLS or non-TLS)

See more Socket/SSL/TLS Examples

Demonstrates how to two programs, one a socket writer and the other a socket reader, can transfer a file. The connection can be TLS or a regular non-encrypted TCP connection. Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Socket;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // On the sending side, we'll load the file into a BinData object and send.
        // On the receiving side, we'll read from the socket connection into a BinData, and save to a file.
        // This example assumes the file is not crazy-large, and that the entire contents
        // can fit into memory.
        // (If the file is too large for memory, there are other ways to send. It just involves streaming or
        // sending the file chunk-by-chunk..)

        // This section of code is for the sender.
        BinData bdToSend = new BinData();
        bdToSend.loadFile("somePath/someFile.dat");
        // Assume success for the example...

        Socket sndSock = new Socket();
        boolean bUseTls = true;
        int port = 5555;
        int maxWaitMs = 5000;
        sndSock.connect("some_domain_or_ip.com", port, bUseTls, maxWaitMs);
        // Assume success for the example...

        // Tell the receiver how many bytes are coming.
        int numBytes = bdToSend.getNumBytes();
        boolean bBigEndian = true;
        sndSock.sendInt32(numBytes, bBigEndian);

        // Send the file data (sends the entire contents of bdToSend).
        sndSock.sendBd(bdToSend, 0, 0);

        // Get an acknowledgement.
        try {
            sndSock.receiveInt32(bBigEndian);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Did the receiver get the correct number of bytes?
        if (sndSock.getReceivedInt() != numBytes) {
            System.out.println("The receiver did not acknowledge with the correct number of bytes.");
            return;
        }

        System.out.println("File sent!");

        // ------------------------------------------------------------------------------------
        // The code below is for the receiving side (running on some other computer..)

        Socket listenSock = new Socket();

        try {
            listenSock.bindAndListen(5555, 25);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the next incoming connection
        // Wait a maximum of 20 seconds (20000 millisec)
        Socket rcvSock = new Socket();
        try {
            listenSock.acceptNext(20000, rcvSock);

            // The sender will first send the big-endian integer for the number of bytes
            // that are forthcoming..
            rcvSock.receiveInt32(bBigEndian);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        int numBytesComing = rcvSock.getReceivedInt();

        // Receive that many bytes..
        BinData bdReceived = new BinData();
        try {
            rcvSock.receiveBdN(numBytesComing, bdReceived);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Acknowledge the sender by sending back the number of bytes we received.
        rcvSock.sendInt32(bdReceived.getNumBytes(), bBigEndian);

        // Close the connection.
        maxWaitMs = 20;
        rcvSock.closeConnection(maxWaitMs);

        // Save the received data to a file.
        bdReceived.writeFile("somePath/someFile.dat");
        // Assume success for the example...

        System.out.println("File received!");
    }
}