Java重修笔记 TCP/IP 传输文件

• 服务器端

public class Homework03Server {
    public static void main(String[] args) throws IOException {
        // 接收文件名, 从磁盘中找到该文件发过去
        // 监听 9999
        ServerSocket serverSocket = new ServerSocket(9999);
        System.out.println("开始监听端口 9999 ");
        // 通过 ServerSocket 获取 socket
        Socket socket = serverSocket.accept();
        // 接收字符串
        InputStream inputStream = socket.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String filePath = reader.readLine();
        // 找该文件
        File file = new File(filePath);
        BufferedInputStream bis;
        BufferedOutputStream bos;
        if (file.exists()) {
            // 该路径文件若存在, 发过去
            bis = new BufferedInputStream(new FileInputStream(file));
            bos = new BufferedOutputStream(socket.getOutputStream());
            byte[] buf = new byte[1024];
            int read;
            while ((read = bis.read(buf)) != -1) {
                bos.write(buf, 0, read);
            }
        } else {
            // 该路径文件若不存在, 发一个默认文件过去
            filePath = "d:\\default.mp4";
            file = new File(filePath);
            bis = new BufferedInputStream(new FileInputStream(file));
            bos = new BufferedOutputStream(socket.getOutputStream());
            byte[] buf = new byte[1024];
            int read;
            while ((read = bis.read(buf)) != -1) {
                bos.write(buf, 0, read);
            }
        }
        socket.getOutputStream();
        System.out.println("服务器端发送完毕... ");

        // 关闭资源
        bos.close();
        bis.close();
        reader.close();
        socket.close();
        serverSocket.close();
    }
}

 

• 客户端

public class Homework03Client {
    public static void main(String[] args) throws IOException {
        // 发送文件名, 然后接收文件
        // 设置 IP 和端口号
        Socket socket = new Socket("192.168.1.4", 9999);
        // 发送字符串
        OutputStream outputStream = socket.getOutputStream();
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream));
        writer.write("d:\\123.mp");
        writer.newLine();
        writer.flush();

        // 接收发过来的视频并写入 src
        InputStream inputStream = socket.getInputStream();
        String filePath = "src\\video.mp4";
        BufferedInputStream bis = new BufferedInputStream(inputStream);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));
        byte[] buf = new byte[1024];
        int read;
        while ((read = bis.read(buf)) != -1) {
            bos.write(buf, 0, read);
        }
        socket.getInputStream();
        // 关闭资源
        bos.close();
        bis.close();
        writer.close();
        socket.close();
    }
}