Java TCP实现文件传送

    import java.io.DataInputStream;
    import java.io.DataOutputStream;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.net.InetSocketAddress;
    import java.net.Socket;
    import java.util.Scanner;
    
    public class TCPClient{
    public static void main(String[] args) {
        Socket socket = new Socket();
        DataInputStream in = null;
        DataOutputStream out = null;
        Scanner scan = new Scanner(System.in);
    
        InetSocketAddress isa = new InetSocketAddress("127.0.0.1",2018);//IP及端口号