Socket编程

客户端：
① 创建Socket对象，指明需要连接的服务器的地址和端口号
② 连接建立后，通过输出流向服务器端发送请求信息
③ 通过输入流获取服务器响应的信息
④ 关闭响应资源

public class ClientApp {
    public static void main(String[] args) throws IOException {

        Socket socket=new Socket("localhost",21341);
        OutputStream os = socket.getOutputStream();//字节输出流

        Scanner sc=new Scanner(System.in);
        while (sc.hasNext()){
            String str=sc.next();
            System.out.println(str);

            os.write(str.getBytes());
        }
    }
}

服务器端：
① 创建ServerSocket对象，绑定监听端口
② 通过accept()方法监听客户端请求
③ 连接建立后，通过输入流读取客户端发送的请求信息
④ 通过输出流向客户端发送响应信息
⑤ 关闭相关资源

public class ServerApp {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(21341);
        //2、调用accept()方法开始监听，等待客户端的连接
        Socket socket = serverSocket.accept();
        //3、获取输入流，并读取客户端信息
        InputStream is = socket.getInputStream();
        while (true) {
            if (is.available() > 0) {
                System.out.println(is.read() + " reamin:" + is.available());
            }
        }

    }
}

交互的消息

//交互：客户端
@SuppressWarnings("all")
public class ClientApp {
    public static void main(String[] args) throws IOException {
        final Socket socket = new Socket("localhost", 21341);
        final OutputStream os = socket.getOutputStream();//字节输出流
        final InputStream is = socket.getInputStream();
        Thread readThread = new Thread(new Runnable() {
            public void run() {
                Scanner sc = new Scanner(is);
                while (sc.hasNext()) {
                    String str = sc.next();
                    System.out.println(str);
                }
            }
        });
        readThread.start();
        Scanner sc=new Scanner(System.in);
        PrintWriter pw=new PrintWriter(os);
        while (sc.hasNext()){
            pw.println(sc.nextLine());
            pw.flush();
        }


    }
}


//服务器端
@SuppressWarnings("all")
public class ServerApp {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(21341);
        //2、调用accept()方法开始监听，等待客户端的连接
        Socket socket = serverSocket.accept();
        final OutputStream os = socket.getOutputStream();//字节输出流
        final InputStream is = socket.getInputStream();
        Thread readThread = new Thread(new Runnable() {
            public void run() {
                Scanner sc = new Scanner(is);
                while (sc.hasNext()) {
                    String str = sc.next();
                    System.out.println(str);
                }
            }
        });
        readThread.start();
        Scanner sc=new Scanner(System.in);
        PrintWriter pw=new PrintWriter(os);
        while (sc.hasNext()){
            pw.println(sc.nextLine());
            pw.flush();
        }

    }
}