Java线程测试高并发

package com.expai.utils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.apache.log4j.Logger;

public class BingfaTest {
    protected static final Logger LOG = Logger.getLogger(BingfaTest.class);
    private static  BingfaTest binfaTest = new BingfaTest();
     public static BingfaTest getInstance() {
            return binfaTest;
        }
     //count为启动线程的个数,httpUrl为请求的url,para为需要传的参数
     public void exeThread(int count,String httpUrl,String para){
         CyclicBarrier cyclicBarrier = new CyclicBarrier(count);
         ExecutorService executorService = Executors.newFixedThreadPool(count);
         for (int i = 0; i < count; i++)
              executorService.execute(new BingfaTest().new Task(cyclicBarrier,httpUrl,para));
         //执行后不再执行新任务shutdown,
         executorService.shutdown();
         //当线程池的工作队列中的所有任务执行完毕，executorService.isTerminated()方法就会返回true。
         while (!executorService.isTerminated()) {
              try {
                   Thread.sleep(10);
              } catch (InterruptedException e) {
                   e.printStackTrace();
              }
         }
     }
     public class Task implements Runnable {
         private CyclicBarrier cyclicBarrier;
         private String httpUrl;
         private String para;

         public Task(CyclicBarrier cyclicBarrier,String httpUrl,String para) {
              this.cyclicBarrier = cyclicBarrier;
              this.httpUrl=httpUrl;
              this.para=para;
         }

         @Override
         public void run() {
              try {
                   // 等待所有任务准备就绪
                   cyclicBarrier.await();
                   // 测试内容
                   URL url =new URL(httpUrl+para);
                   HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
                   connection.setDoOutput(true);  
                   connection.setDoInput(true);
                   //组织提交信息
                   PrintWriter out = new PrintWriter(connection.getOutputStream());
                   out.print(para);
                   out.flush();
                   //获得返回信息
                   BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                   String line=null;
                   //返回的参数拼接成字符串
                   StringBuffer content = new StringBuffer();
                   while((line=in.readLine())!=null){
                       content.append(line);
                   }
                   in.close();
                   LOG.info("返回数据====="+content.toString());
              } catch (Exception e) {
                   e.printStackTrace();
              }
         }
    }
}