передача файлов между сервером и клиентом

java-Socketchannel example.java

package ru.ezhov.fileserver;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.FileChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.logging.Logger;

//https://ru.stackoverflow.com/questions/813450/%d0%9f%d0%b5%d1%80%d0%b5%d0%b4%d0%b0%d1%87%d0%b0-%d1%84%d0%b0%d0%b9%d0%bb%d0%be%d0%b2-nio2
public class NioServer {
    private static final Logger LOG = Logger.getLogger(NioServer.class.getName());

    private static final int PORT = 55555;
    private static final String FILE_PATH = "E:\\test-java.java";

    public static void main(String[] args) {
        try {
            try (ServerSocketChannel serverSocketChannel = ServerSocketChannel.open()) {
                serverSocketChannel.bind(new InetSocketAddress(PORT));
                try (SocketChannel socketChannel = serverSocketChannel.accept()) {
                    try (FileChannel fileChannel =
                                 FileChannel.open(
                                         Paths.get(FILE_PATH),
                                         StandardOpenOption.CREATE,
                                         StandardOpenOption.WRITE
                                 )
                    ) {
                        fileChannel.transferFrom(socketChannel, 0, Long.MAX_VALUE);
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

class NioClient {
    private static final int PORT = 55555;
    private static final String HOST = "localhost";
    private static final String FILE_NAME = "SOURCE";

    public static void main(String args[]) {
        try {
            InetSocketAddress serverAddress = new InetSocketAddress(HOST, PORT);
            try (SocketChannel socketChannel = SocketChannel.open(serverAddress)) {
                try (FileChannel fileChannel = FileChannel.open(Paths.get(FILE_NAME))) {
                    fileChannel.transferTo(0, fileChannel.size(), socketChannel);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}