System.setProperty("sun.net.client.defaultConnectTimeout", "3000");
?? ??? ?System.setProperty("sun.net.client.defaultReadTime ", "3000");
?? ??? ?
?? ??? ?URL url1=null;
?? ??? ?try {
?? ??? ??? ?url1 = new URL(url);
?? ??? ??? ?HttpURLConnection urlCon = (HttpURLConnection)url1.openConnection();
?? ??? ??? ?System.out.println(urlCon);
?? ??? ??? ? BufferedReader in = null;
?? ??? ???????? try {
?? ??? ?????????? in = new BufferedReader(
?? ??? ???????????? new InputStreamReader(
?? ??? ??????????? ??? ??? ?urlCon.getInputStream()));
?? ??? ?????????? String inputLine;
?? ??? ?????????? while (
?? ??? ???????????? (inputLine = in.readLine()) != null) {
?? ??? ???????????? System.out.println(inputLine);
?? ??? ?????????? }
?? ??? ???????? } catch (IOException e) {
?? ??? ?????????? e.printStackTrace();
?? ??? ???????? }
?? ??? ???????? in.close();
?? ??? ???????? urlCon.disconnect();
?? ??? ?} catch (Exception e1) {
?? ??? ??? ?e1.printStackTrace();
?? ??? ?}

http://tech.techweb.com.cn/archiver/tid-225522.html
http://gceclub.sun.com.cn/Java_Docs/html/zh_CN/api/java/net/HttpURLConnection.html
http://zhuixue.javaeye.com/blog/385793