Java URLConnection超时

Question

我试图从HTTP URL解析XML文件.如果XML提取时间超过此时间,我想配置15秒的超时,我想报告超时.出于某种原因,setConnectTimeout和setReadTimeout不起作用.这是代码:

          URL url = new URL("http://www.myurl.com/sample.xml");
          URLConnection urlConn = url.openConnection();
          urlConn.setConnectTimeout(15000);
          urlConn.setReadTimeout(15000);
          urlConn.setAllowUserInteraction(false);         
          urlConn.setDoOutput(true);

          InputStream inStream = urlConn.getInputStream();
          InputSource input = new InputSource(inStream);

我正在捕捉SocketTimeoutException.

谢谢克里斯

Answer 1

试试这个:

       import java.net.HttpURLConnection;

       URL url = new URL("http://www.myurl.com/sample.xml");

       HttpURLConnection huc = (HttpURLConnection) url.openConnection();
       HttpURLConnection.setFollowRedirects(false);
       huc.setConnectTimeout(15 * 1000);
       huc.setRequestMethod("GET");
       huc.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)");
       huc.connect();
       InputStream input = huc.getInputStream();

要么

       import org.jsoup.nodes.Document;

       Document doc = null;
       try {
           doc = Jsoup.connect("http://www.myurl.com/sample.xml").get();
       } catch (Exception e) {
           //log error
       }

并看看如何使用Jsoup:http://jsoup.org/cookbook/input/load-document-from-url

Answer 2

您可以通过线程睡眠手动强制断开连接.这是一个例子:

URLConnection con = url.openConnection();
con.setConnectTimeout(5000);
con.setReadTimeout(5000);
new Thread(new InterruptThread(con)).start();

然后

public class InterruptThread implements Runnable {

    HttpURLConnection con;
    public InterruptThread(HttpURLConnection con) {
        this.con = con;
    }

    public void run() {
        try {
            Thread.sleep(5000); // or Thread.sleep(con.getConnectTimeout())
        } catch (InterruptedException e) {

        }
        con.disconnect();
        System.out.println("Timer thread forcing to quit connection");
    }
}

Answer 3

您可以通过更改以下系统属性来设置从jvm进行的所有连接的超时:

System.setProperty("sun.net.client.defaultConnectTimeout", "10000");
System.setProperty("sun.net.client.defaultReadTimeout", "10000");

每次连接都会在10秒后超时.

不需要设置'defaultReadTimeout',但如果需要控制读数,则显示为示例.

Answer 4

我使用类似的代码从服务器下载日志.我调试我的代码并发现返回的URLConnection的实现是sun.net.www.protocol.http.HttpURLConnection.

抽象类java.net.URLConnection有两个属性connectTimeout和readTimeout,setter是抽象类.信不信由你实现sun.net.www.protocol.http.HttpURLConnection具有相同的属性connectTimeout和readTimeout没有setter,实现类的属性用在getInputStream方法中.因此没有使用设置connectTimeout和readTimeout,因为它们从未在getInputStream方法中使用.在我看来,这是sun.net.www.protocol.http.HttpURLConnection实现中的错误.

我的解决方案是使用HttpClient和Get请求.