模拟并发用户发送请求

public class ConcurrentInvoiceTest {
  final static SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

  public static void main(String[] args) {
    CountDownLatch latch=new CountDownLatch(1);

    for(int i=0;i<20;i++){//模拟20个用户
      AnalogUser analogUser = new AnalogUser("user"+i,"50",latch);
      analogUser.start();
    }
    latch.countDown();//计数器減一  所有线程释放 并发访问。
    System.out.println("所有模拟请求结束  at "+sdf.format(new Date()));
  }

  static class AnalogUser extends Thread {

    String workerName;//模拟用户姓名
    String newReadInvoiceNum;
    CountDownLatch latch;

    public AnalogUser(String workerName, String newReadInvoiceNum,
        CountDownLatch latch) {
      this.workerName = workerName;
      this.newReadInvoiceNum = newReadInvoiceNum;
      this.latch = latch;
    }

    @Override
    public void run() {
      // TODO Auto-generated method stub
      try {
        latch.await(); //一直阻塞当前线程，直到计时器的值为0
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    boolean flag=  post();//发送post 请求
      System.out.println( "flag=="+flag);


    }
    public  boolean post() {
   
      String path = "http://localhost:8080/query";
      Map<String, String> params = new HashMap<String, String>();
      params.put("newReadInvoiceNum", newReadInvoiceNum);
      try {
        return sendHttpClientPOSTRequest(path, params, "UTF-8");
      } catch (Exception e) {
        e.printStackTrace();
      }
      return false;
    }

    private static boolean sendHttpClientPOSTRequest(String path, Map<String, String> params, String encoding) throws Exception{
      List<NameValuePair> pairs = new ArrayList<NameValuePair>();//存放请求参数
      if(params!=null && !params.isEmpty()){
        for(Map.Entry<String, String> entry : params.entrySet()){
          pairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
      }
      UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding);
      HttpPost httpPost = new HttpPost(path);
      httpPost.setEntity(entity);
      DefaultHttpClient client = new DefaultHttpClient();
      HttpResponse response = client.execute(httpPost);
      if(response.getStatusLine().getStatusCode() == 200){
        return true;
      }
      return false;
    }
  }

}