java并发压力测试

package com.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

public class Test {
 private static int thread_num=150;
 private static int client_num=500;
 private static Map keywordMap=new HashMap();
 
 static {
  InputStreamReader isr;
  try {
   isr = new InputStreamReader(new FileInputStream(new File("D:/clicks.txt")),"GBK");
   BufferedReader buffer=new BufferedReader(isr);
   String line="";
   while ((line=buffer.readLine())!=null) {
    keywordMap.put(line.substring(0, line.lastIndexOf(":")),"");      
   }
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } 
 }

 public static void main(String[] args) {
  int size=keywordMap.size();
  ExecutorService exec=Executors.newCachedThreadPool();
  // 50个线程可以同时访问
  final Semaphore semp=new Semaphore(thread_num);
  // 模拟2000个客户端访问
  for (int index = 0; index < client_num; index++) {
   final int NO = index;
   Runnable run = new Runnable() {
    public void run() {
     try {     
     // 获取许可
     semp.acquire();
     System.out.println("Thread:" + NO);
     //System.out.println("semp:" + semp);
     String host = "http://192.168.30.31:8088/AndroidWebService";
     
     //System.out.println(host + para);
     System.out.println("host--"+host);
     URL url=new URL(host);// 此处填写供测试的url
     HttpURLConnection connection=(HttpURLConnection)url.openConnection();
     //connection.setRequestMethod("POST");
     //connection.setRequestProperty("Proxy-Connection","Keep-Alive");
     connection.setDoOutput(true);
     connection.setDoInput(true);
     PrintWriter out=new PrintWriter(connection.getOutputStream());     
     out.flush();
     out.close();
     BufferedReader in=new BufferedReader(new InputStreamReader(connection.getInputStream()));
     String line="";
     String result="";
     while ((line=in.readLine())!=null) {
      result +=line;
     }
     System.out.println("result--"+result);
     // Thread.sleep((long) (Math.random()) * 1000);
     // 释放
     System.out.println("第：" + NO + " 个");
     semp.release();
     
     } catch (Exception e) {
      e.printStackTrace();
     }
    }
   };
   exec.execute(run);
  }
  // 退出线程池
  exec.shutdown();
 }
 private static String getRandomSearchKey(final int no){
  String ret="";
  int size=keywordMap.size();
  // int wanna = (int) (Math.random()) * (size - 1);
  ret = (keywordMap.entrySet().toArray())[no].toString();
  ret = ret.substring(0, ret.lastIndexOf("="));
  System.out.println("ret--"+" " + ret);
  return ret;
 }

}

 

 

http://www.blogjava.net/alinglau36/archive/2010/05/28/322118.html