package com.example.nettydemo.bio; import java.io.IOException; import java.io.InputStream; import java.net.ServerSocket; import java.net.Socket; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; /** * Blocking IO * 测试 * telnet 127.0.0.1 6666 * ctrl+] * send 数据 * Microsoft Telnet> send hello * @author ukzq * * Java BIO 问题分析 * 1) 每个请求都需要创建独立的线程,与对应的客户端进行数据Read,业务处理,数据Write,数据交互 * 2) 当并发数较大时,需要创建大量线程来处理连接,系统资源占用较大 * 3) 连接建立后,如果当前线程暂时没有数据可读,则线程就阻塞在Read操作上,造成线程资源浪费 * */ public class BIOServer { public static void main(String[] args) throws IOException { //创建线程池 ExecutorService cachedThreadPool = Executors.newCachedThreadPool(); //创建ServerSocket ServerSocket serverSocket = new ServerSocket(6666); System.out.println("BIOServer服务器启动了"); while(true){ System.out.println("线程信息id="+Thread.currentThread().getId()+",名字="+Thread.currentThread().getName()); //监听,等待客户端连接 System.out.println("等待连接..."); final Socket socket = serverSocket.accept(); System.out.println("连接到一个客户端"); //就创建一个线程,与之通讯(单独写一个方法) cachedThreadPool.execute(new Runnable() { @Override public void run() { //可以和客户端通讯 handler(socket); } }); } } //编写一个handler方法,和客户端通讯 public static void handler(Socket socket) { try { System.out.println("线程信息 id =" + Thread.currentThread().getId() + " 名字=" + Thread.currentThread().getName()); byte[] bytes = new byte[1024]; //通过socket 获取输入流 InputStream inputStream = socket.getInputStream(); //循环的读取客户端发送的数据 while (true) { System.out.println("线程信息 id =" + Thread.currentThread().getId() + " 名字=" + Thread.currentThread().getName()); System.out.println("read...."); int read = inputStream.read(bytes); if(read != -1) { System.out.println(new String(bytes, 0, read )); //输出客户端发送的数据 } else { break; } } }catch (Exception e) { e.printStackTrace(); }finally { System.out.println("关闭和client的连接"); try { socket.close(); }catch (Exception e) { e.printStackTrace(); } } } }