TCP实现连接传输案例

介绍

a.网络通信协议(基于TCP协议的通信)
b.IP地址: 网上计算机的唯一标识(相当于身份证号)
c.端口号: 计算机上软件的标识
    端口号一共有:0-65535这个多个,我们写的软件建议使用1024以上的,因为1024一下的被牛逼知名软件服务占用的

使用的类

ServerSocket 服务器端
    
构造方法：ServerSocket(端口号); 接收端使用
方法：accept(); 返回一个 Socket对象
getInetAddress();返回发送端的地址 InetAddress对象

Socket 客户端 发送端
构造方法：
    Socket(IP地址，端口号);
    Socket(主机名，端口号);
方法：

　　public OutputStream getOutputStream();//获取连接通道中的输出流
　　public InputStream getInputStream();//获取连接通道中的输入流
　　public void close();//关闭客户端,释放资源,断开连接

　　public void shutdownOutput();//关闭连接通道中的输出流
　　public void shutdownInput();//关闭连接通道中的输入流

服务器端创建：

public class SockteTcp {
    public static void main(String[] args) throws Exception {
        Socket socket = new Socket("127.0.0.1", 60);
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("服务器你好,我给你发了个1.txt".getBytes());
        FileInputStream fileInputStream = new FileInputStream("111.txt");
        int len = 0;
        while ((len = fileInputStream.read()) != -1) {
            outputStream.write(len);
        }
        socket.shutdownOutput();
        InputStream inputStream = socket.getInputStream();
        byte[] bytes = new byte[1024];
        len = inputStream.read(bytes);
        System.out.println(new String(bytes, 0, len));
    }
}

创建客户端：

public class ServerSocketTcp {
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(60);
        Socket accept = serverSocket.accept();
        InputStream inputStream = accept.getInputStream();
        byte[] bytes = new byte[1024];
        int len = inputStream.read(bytes);
        System.out.println(new String(bytes, 0, len));
        FileOutputStream fileOutputStream = new FileOutputStream("server.txt");
        while ((len = inputStream.read()) != -1) {
            fileOutputStream.write(len);
        }
        //返回给客户端消息
        OutputStream outputStream = accept.getOutputStream();
        outputStream.write("恭喜拷贝成功".getBytes());
    }
}

 其他案例：
     服务器使用多线程实现多人传送文件
     将服务器实现代码实现Runnable接口
     重写run方法，封装到run方法中
//服务器

public class ServerSocketTcp {
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(60);
        while (true) {
            Socket accept = serverSocket.accept();
            InputStream inputStream = accept.getInputStream();
            new Thread(() -> {
                try {
                    byte[] bytes = new byte[1024];
                    int len = inputStream.read(bytes);
                    System.out.println(new String(bytes, 0, len));
                    FileOutputStream fileOutputStream = new FileOutputStream("server" + System.currentTimeMillis() + ".txt");
                    while ((len = inputStream.read()) != -1) {
                        fileOutputStream.write(len);
                    }
                    OutputStream outputStream = accept.getOutputStream();
                    outputStream.write("恭喜拷贝成功".getBytes());
                    outputStream.close();
                    fileOutputStream.close();
                    inputStream.close();
                    accept.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }).start();
        }
    }
}

//客户端

public class SockteTcp {
    public static void main(String[] args) throws Exception {
        Socket socket = new Socket("127.0.0.1", 60);
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("服务器你好,我给你发了个1.txt".getBytes());
        FileInputStream fileInputStream = new FileInputStream("111.txt");
        int len = 0;
        while ((len = fileInputStream.read()) != -1) {
            outputStream.write(len);
        }
        socket.shutdownOutput();
        InputStream inputStream = socket.getInputStream();
        byte[] bytes = new byte[1024];
        len = inputStream.read(bytes);
        System.out.println(new String(bytes, 0, len));
        inputStream.close();
        fileInputStream.close();
        outputStream.close();
        socket.close();
    }
}