多个线程访问url

package com.aig.ecompassios.ecard;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import net.sf.json.JSONObject;public class EcardThread extends Thread {static int i=0;static String ebToken="";static long time;public EcardThread(int i,String ebToken){this.i = i;this.ebToken = ebToken;}public void run() {String ecard="http://localhost:9080/";long begintime = System.currentTimeMillis();StringBuilder jsonECard = new StringBuilder();try {//ECard urlThread.sleep(1000);URL eCardURL = new URL(ecard+ebToken);HttpURLConnection urlconECard = (HttpURLConnection)eCardURL.openConnection();urlconECard.connect(); //获取连接InputStream isECard = urlconECard.getInputStream();BufferedReader bufferECard = new BufferedReader(new InputStreamReader(isECard,"UTF-8"));String lECard = null;while((lECard=bufferECard.readLine())!=null){jsonECard.append(lECard);}System.out.println(jsonECard.toString());System.out.println("Thread"+i+"执行时间为："+(System.currentTimeMillis()-begintime)+"毫秒");time+=(System.currentTimeMillis()-begintime);System.out.println(time+"++++++");} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static void main(String[] args) {long begintime = System.currentTimeMillis();String ebToken = login();/*for (int i = 0; i < 2; i++) {EcardThread th = new EcardThread(i,ebToken);th.start();}*/System.out.println(time+"=======");while(time<0.3*60*1000){EcardThread th = new EcardThread(i,ebToken);th.start();i=i+1;}System.out.println("总执行时间为："+(System.currentTimeMillis()-begintime)+"毫秒");}}