NIO系列-02-升级版BIO

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声明

该系列文章由书籍《Netty权威指南》第二版整理而来。只为记录学习笔记。
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时间服务器升级版线程池的BIO
- 服务端代码
- 客户端代码
- 总结

时间服务器–升级版(线程池)的BIO

服务端代码

服务端主程序

public class TimeServer {    public static void main(String[] args) {        int port = 1234;        ServerSocket server = null;        try {            server = new ServerSocket(port);            System.out.println("The time server is listening in port : " + port);            Socket socket = null;            // 线程池            ClientHandlerPool singleExecutor = new ClientHandlerPool(50, 10000);            while (true) {                socket = server.accept();                singleExecutor.execute(new TimeServerHandler(socket));            }        } catch (IOException e) {            e.printStackTrace();        } finally {            if (server != null) {                try {                    server.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}

服务端线程池

public class ClientHandlerPool {    private ExecutorService executor;    public ClientHandlerPool(int maxPoolSize, int queueSize) {        executor = new ThreadPoolExecutor(Runtime.getRuntime().availableProcessors(), maxPoolSize, 120L,                TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(queueSize));    }    public void execute(Runnable task) {        executor.execute(task);    }}

服务端处理器类

public class TimeServerHandler implements Runnable {    private Socket socket;    private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    public TimeServerHandler(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;                out.println(this.sdf.format(new Date()));            }        } catch (Exception e) {            if (in != null) {                try {                    in.close();                } catch (IOException e1) {                    e1.printStackTrace();                }            }            if (out != null) {                out.close();                out = null;            }            if (this.socket != null) {                try {                    this.socket.close();                } catch (IOException e1) {                    e1.printStackTrace();                }            }        }    }}

客户端代码

客户端代码和上一篇文章“传统BIO”一致。

总结

这种升级版BIO模型有如下特点:

服务端资源开销可控
当服务端队列积满后，新的连接必须排队
可能导致所有的新的连接都超时

参考资料: 《Netty权威指南》第二版

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