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网络编程基础篇

日期:2018-10-27点击:322
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传统的BIO编程,服务器的主线程需要先阻塞,然后等待客户端的请求才去创建线程执行。一般分为两个部分,client和server。在网络良好的情况下,一般没有什么问题,但是网络不好的情况,会导致效率很低。

Server.java

package bhz.bio; import java.io.IOException; import java.net.ServerSocket; import java.net.Socket; 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 .. "); while(true){ //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; } } } 

Client.java

package bhz.bio; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; 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..."); 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; } } } 

ServerHandler.java

package bhz.bio; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; 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; } } } 
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伪异步IO一般都是通过线程池来实现的,它的效率比传统的网络IO要高,它是异步执行的。代码就是比上面的代码多了一个HandlerExecutorPool.java,而且Server.java也改写了一下。
HandlerExecutorPool.java

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

Server.java

public class Server { final static int PORT = 8765; public static void main(String[] args) { ServerSocket server = null; BufferedReader in = null; PrintWriter out = null; try { server = new ServerSocket(PORT); System.out.println("server start"); Socket socket = null; HandlerExecutorPool executorPool = new HandlerExecutorPool(50, 1000); while(true){ socket = server.accept(); executorPool.execute(new ServerHandler(socket)); } } catch (Exception e) { e.printStackTrace(); } finally { if(in != null){ try { in.close(); } catch (Exception e1) { e1.printStackTrace(); } } if(out != null){ try { out.close(); } catch (Exception e2) { e2.printStackTrace(); } } if(server != null){ try { server.close(); } catch (Exception e3) { e3.printStackTrace(); } } server = null; } } } 

NIO编程

nio编程的核心是缓冲区,也就是Buffer对象,而传统的IO是流,也就是Stream对象。因为nio编程的操作比较繁琐,所以一般都是通过netty等网络编程框架来实现网络编程。


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AIO编程

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原文链接:https://yq.aliyun.com/articles/669584
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