Java 网络IO编程（BIO、NIO、AIO）

BIO编程

传统的BIO编程

代码示例：

public class Server {
    final static int PROT = 8765;

    public static void main(String[] args) {
        ServerSocket server = null;
        try {
            server = new ServerSocket(PROT);
            System.out.println(" server start .. ");
            // 进行阻塞
            Socket socket = server.accept();
            // 新建一个线程执行客户端的任务
            new Thread(new ServerHandler(socket)).start();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (server != null) {
                try {
                    server.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            server = null;
        }
    }
}


public class ServerHandler implements Runnable {

    private Socket socket;

    public ServerHandler(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        BufferedReader in = null;
        PrintWriter out = null;
        try {
            in = new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
            out = new PrintWriter(this.socket.getOutputStream(), true);
            String body = null;
            while (true) {
                body = in.readLine();
                if (body == null)
                    break;
                System.out.println("Server :" + body);
                out.println("服务器端回送响的应数据.");
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            socket = null;
        }
    }
}


public class Client {
    final static String ADDRESS = "127.0.0.1";
    final static int PORT = 8765;
    public static void main(String[] args) {
        Socket socket = null;
        BufferedReader in = null;
        PrintWriter out = null;

        try {
            socket = new Socket(ADDRESS, PORT);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);

            // 向服务器端发送数据
            out.println("接收到客户端的请求数据...");
            // out.println("接收到客户端的请求数据1111...");
            String response = in.readLine();
            System.out.println("Client: " + response);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            socket = null;
        }
    }
}

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