JAVA并发处理经验(四)并行模式与算法6：socket的服务端多线程

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一、前言

关于网络编程，这一章一般用NIO编程，但是我们得一步步，免得扯着蛋蛋。我们先温习一下，socket的服务器---客户端；我们适用服务端用线程池，线程池没有懂得小火炮，看以前的，或者直接问群里就ok。

二、socket服务端多线程

友情提示：可以用spring或者注解线程池，在实际运用的时候；

2.1 socket线程池实现客户端

package pattern.nio;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * Created by ycy on 16/1/18. */public class MultiThreadEchoserver {    private static ExecutorService tp = Executors.newCachedThreadPool();    static class HandleMsg implements Runnable {        Socket clientSocket;        public HandleMsg(Socket clientSocket) {            this.clientSocket = clientSocket;        }        public void run() {            BufferedReader is = null;            PrintWriter os = null;            try {                is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));                  os=new PrintWriter(clientSocket.getOutputStream(),true);                //从inputstream 中读取客户端发送的数据                String inputString =null;                long b = System.currentTimeMillis();                while ((inputString = is.readLine()) != null) {                    System.out.println("搜到客户端数据"+inputString);                    os.println(inputString+"--来自服务端");                }                long e = System.currentTimeMillis();                System.out.println("spend:" + (e - b) + "ms");            } catch (IOException e) {                e.printStackTrace();            } finally {                try {                    if (is != null) {                        is.close();                    }                    if (os != null) {                        os.close();                    }                    clientSocket.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    public static void main(String[] args) {        ServerSocket serverSocke = null;        Socket clientSocket = null;        try {            serverSocke = new ServerSocket(65500);        } catch (IOException e) {            e.printStackTrace();        }        while (true) {            try {                clientSocket = serverSocke.accept();                System.out.println(clientSocket.getRemoteSocketAddress() + " conect");                tp.execute(new HandleMsg(clientSocket));            } catch (IOException e) {                e.printStackTrace();            }        }    }}

2.2 socke客户端

注意里面注解：巨坑

package pattern.nio;import java.io.*;import java.net.InetSocketAddress;import java.net.Socket;import java.net.UnknownHostException;/** * Created by ycy on 16/1/18. */public class Client {    public static void main(String[] args) throws IOException {        Socket client=null;        PrintWriter writer=null;        BufferedReader reader=null;        try {            client=new Socket();            client.connect(new InetSocketAddress("127.0.0.1",65500));            writer=new PrintWriter(client.getOutputStream(),true);            OutputStream os=client.getOutputStream();            String secondeString="这个是通过os传送得---";            os.write(secondeString.getBytes());            //巨坑:如果你服务端口用readline来读取,客户端用print 来写入数据,那么客户端就一直不能关闭.不信你试一试            writer.printf("hello");            writer.flush();            reader=new BufferedReader(new InputStreamReader(client.getInputStream()));            System.out.println("from serverL:"+reader.readLine());        }catch (UnknownHostException e){            e.printStackTrace();        }catch (IOException e){            e.printStackTrace();        }finally {            if (writer!=null){                writer.close();            }            if (reader!=null){                reader.close();            }            if (client!=null){                client.close();            }        }    }}

2.3 高io的客户端

package pattern.nio;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.InetSocketAddress;import java.net.Socket;import java.net.UnknownHostException;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.locks.LockSupport;/** * Created by ycy on 16/1/19. * 这个适用LockSupport阻塞当前线程模拟 * io耗时的情况,服务器响应就慢了; * 在其他语言里面,所以不要这么用,这么用就显得逼格不高了.就像生产者-消费者一样,高逼格都是用队列服务器了 * */public class HeavySocketClient {    private static ExecutorService tp = Executors.newCachedThreadPool();    private static final int sleep_time = 1000 * 1000 * 1000;    public static class EchoClient implements Runnable {        public void run() {            Socket client = null;            PrintWriter writer = null;            BufferedReader reader = null;            try {                client = new Socket();                client.connect(new InetSocketAddress("127.0.0.1", 65500));                writer = new PrintWriter(client.getOutputStream(), true);                writer.print("high client");                LockSupport.parkNanos(sleep_time);                writer.print("end client1");                LockSupport.parkNanos(sleep_time);                writer.print("end client2");                LockSupport.parkNanos(sleep_time);                writer.print("end client3");                LockSupport.parkNanos(sleep_time);                writer.print("end client4");                LockSupport.parkNanos(sleep_time);                writer.print("end client5");                LockSupport.parkNanos(sleep_time);                writer.print("end client6");                writer.println();                writer.flush();                reader = new BufferedReader(new InputStreamReader(client.getInputStream()));                System.out.println("from server:" + reader.readLine());            } catch (UnknownHostException  e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            } finally {                try {                    if (writer != null) {                        writer.close();                    }                    if (reader != null) {                        reader.close();                    }                    if (client != null) {                        client.close();                    }                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    public static void main(String[] args) {        EchoClient ec=new EchoClient();        for (int i = 0; i <10 ; i++) {            tp.submit(ec);        }    }}

三、预告

本身就不熟悉的socket服务，看起来还是不尽人意。你不熟悉，并不是因为你差，是因为这个市场需要这个少。呵呵。那么未来解决io慢得情况，我们适用NIO编辑，这个才是网络编程的实用点哦

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