Java模拟并发操作进行压力测试代码

import java.io.BufferedReader; 　　import java.io.File; 　　import java.io.FileInputStream; 　　import java.io.InputStreamReader; 　　import java.io.PrintWriter; 　　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 ConcurrentTest { 　　private static int thread_num = 200; 　　private static int client_num = 460; 　　private static Map keywordMap = new HashMap(); 　　static { 　　try { 　　InputStreamReader isr = new InputStreamReader(new FileInputStream( 　　new File("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) { 　　e.printStackTrace(); 　　} 　　} 　　public static void main(String[] args) { 　　int size = keywordMap.size(); 　　// TODO Auto-generated method stub 　　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); 　　String host = "http://10.99.23.42:7001/KMQueryCenter/query.do?"; 　　String para = "method=getQueryResult&pageNum=1&pageSize=5&" 　　+ "queryKeyWord=" 　　+ getRandomSearchKey(NO) 　　+ "&questionID=-1&questionIdPath=-1&searchType=1" 　　+ "&proLine=&proSeries=&proType=" + NO; 　　System.out.println(host + para); 　　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.print(para); 　　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); 　　// 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("\t" + ret); 　　return ret; 　　} 　　}