一个服务器连接多个客户端上传文件

public class TCPClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("192.168.196.1", 9999);
//        InetAddress localHost = InetAddress.getLocalHost();
//        String hostAddress = localHost.getHostAddress();
//        System.out.println(hostAddress);
        //获取通道输出流
        OutputStream out = socket.getOutputStream();
        //包装输出流
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out));
        //需要上传的文件
        BufferedReader reader = new BufferedReader(new FileReader("Client.txt"));
        String line = null;
        while ((line = reader.readLine())!=null) {
            writer.write(line);
            writer.newLine();
            writer.flush();
        }
        //禁用此套接字的输出流。对于 TCP 套接字，任何以前写入的数据都将被发送，并且后跟 TCP 的正常连接终止序列
        //表示我输出完了
        socket.shutdownOutput();
        //收取服务端发来的反馈
        InputStream in = socket.getInputStream();
        byte[] bytes = new byte[1024 * 8];
        int len = in.read(bytes);
        String s = new String(bytes, 0, len);
        System.out.println(s);
        socket.close();

    }
}

public class TCPServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(9999);
        System.out.println("服务器已开启等待连接....");
        int i = 0;
        while (true) {
            System.out.println((i++)+"位客户端已连接");
            Socket accept = serverSocket.accept();
            //采用多线程方式
            new UploadThread(accept).start();
        }

    }
}

public class UploadThread extends Thread {
    private Socket accept;

    public UploadThread(Socket accept) {

        this.accept = accept;
    }

    @Override
    public void run() {
        try {
            InputStream in = accept.getInputStream();
            //包装输入流
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            //为了防止文件覆盖System.currentTimeMillis
            BufferedWriter writer = new BufferedWriter(new FileWriter(System.currentTimeMillis() + "copy.txt"));
            String line = null;
            while ((line = reader.readLine())!=null) {
                writer.write(line);
                writer.newLine();
                writer.flush();
            }
            //服务端反馈
            OutputStream out = accept.getOutputStream();
            out.write("上传成功!".getBytes());
            writer.close();
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }