用TCP协议写一个客户端和一个服务端，实现上传文件

客户端：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;

public class TCP_File_Send {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1", 7878);

        OutputStream output = socket.getOutputStream();
        FileInputStream input = new FileInputStream(new File("C:\\ESD\\abc.txt"));

        byte[] buf = new byte[1024];
        int len = -1;
        while ((len = input.read(buf)) != -1) {
            output.write(buf, 0, len);
        }

        input.close();
        socket.close();

    }
}

服务端：

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class TCP_File_Server {
    public static void main(String[] args) throws IOException {
        ServerSocket ss = new ServerSocket(7878);

        Socket accept = ss.accept();

        InputStream input = accept.getInputStream();
        FileOutputStream output = new FileOutputStream("C:\\ESD\\def.txt");

        byte[] buf = new byte[1024];
        int len = -1;

        while ((len = input.read(buf)) != -1) {
            output.write(buf, 0, len);
        }

        output.close();
        ss.close();
    }
}

第一次写博客！还请多多指教。