import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
public static void main(String[] args) throws IOException {
ServerSocket server = null;
try {
server = new ServerSocket(8000);
System.out.println(“啟動成功！”);
} catch (IOException e) {
System.out.println(“啟動伺服器出錯！”);
}
Socket socket = null;
try {
socket = server.accept();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("…連線成功！");
InputStream in = socket.getInputStream();
OutputStream out = new FileOutputStream(“D:\a.txt”);
byte[] ch = new byte[1024];
int len = 0;
while ((len = in.read(ch)) != -1) {
out.write(ch, 0, len);
}
OutputStream outSoc = socket.getOutputStream();
outSoc.write(“上傳成功！”.getBytes());

	out.close();
	server.close();
	socket.close();
}

}

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {

public static void main(String[] args) throws UnknownHostException, IOException {
	Socket socket =new Socket(InetAddress.getLocalHost(),8000);
	InputStream input = new FileInputStream("D:\\a.txt");
	OutputStream out = socket.getOutputStream();
	byte[] buf = new byte[1024];
	int len = 0;
	while ((len = input.read(buf)) != -1) {
		out.write(buf, 0, len);
	}
	out.flush();

	BufferedReader bufs = new BufferedReader(new InputStreamReader(socket.getInputStream()));
	System.out.println(new String(bufs.readLine()));

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

}

截圖：