blocks|key|1040424|text|您可以像这样设置超时，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1040425|con.setConnectTimeout(connectTimeout);
con.setReadTimeout(socketTimeout);|code-block|syntax|javascript|1040426|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can set timeout like this,

<pre><code>con.setConnectTimeout(connectTimeout);
con.setReadTimeout(socketTimeout);
</code></pre>

blocks|key|1040481|text|如果HTTP连接没有超时，你可以在后台线程本身(+AsyncTask，服务等)中实现超时检查器，下面的类是一个自定义AsyncTask的例子，它在一定时间后超时|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1040482|public+abstract+class+AsyncTaskWithTimer<Params,+Progress,+Result>+extends
++++AsyncTask<Params,+Progress,+Result>+{

private+static+final+int+HTTP_REQUEST_TIMEOUT+=+30000;

@Override
protected+Result+doInBackground(Params...+params)+{
++++createTimeoutListener();
++++return+doInBackgroundImpl(params);
}

private+void+createTimeoutListener()+{
++++Thread+timeout+=+new+Thread()+{
++++++++public+void+run()+{
++++++++++++Looper.prepare();

++++++++++++final+Handler+handler+=+new+Handler();
++++++++++++handler.postDelayed(new+Runnable()+{
++++++++++++++++@Override
++++++++++++++++public+void+run()+{

++++++++++++++++++++if+(AsyncTaskWithTimer.this+!=+null
++++++++++++++++++++++++++++&&+AsyncTaskWithTimer.this.getStatus()+!=+Status.FINISHED)
++++++++++++++++++++++++AsyncTaskWithTimer.this.cancel(true);
++++++++++++++++++++handler.removeCallbacks(this);
++++++++++++++++++++Looper.myLooper().quit();
++++++++++++++++}
++++++++++++},+HTTP_REQUEST_TIMEOUT);

++++++++++++Looper.loop();
++++++++}
++++};
++++timeout.start();
}

abstract+protected+Result+doInBackgroundImpl(Params...+params);
}|code-block|syntax|javascript|1040483|这方面的示例|1040484|public+class+AsyncTaskWithTimerSample+extends+AsyncTaskWithTimer<Void,+Void,+Void>+{

++++@Override
++++protected+void+onCancelled(Void+void)+{
++++++++Log.d(TAG,+"Async+Task+onCancelled+With+Result");
++++++++super.onCancelled(result);
++++}

++++@Override
++++protected+void+onCancelled()+{
++++++++Log.d(TAG,+"Async+Task+onCancelled");
++++++++super.onCancelled();
++++}

++++@Override
++++protected+Void+doInBackgroundImpl(Void...+params)+{
++++++++//+Do+background+work
++++++++return+null;
++++};
+}|1040485|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If the HTTP Connection doesn't timeout, You can implement the timeout checker in the background thread itself (AsyncTask, Service, etc), the following class is an example for Customize AsyncTask which timeout after certain period

<pre><code>public abstract class AsyncTaskWithTimer&lt;Params, Progress, Result&gt; extends
 AsyncTask&lt;Params, Progress, Result&gt; {

private static final int HTTP_REQUEST_TIMEOUT = 30000;

@Override
protected Result doInBackground(Params... params) {
 createTimeoutListener();
 return doInBackgroundImpl(params);
}

private void createTimeoutListener() {
 Thread timeout = new Thread() {
 public void run() {
 Looper.prepare();

 final Handler handler = new Handler();
 handler.postDelayed(new Runnable() {
 @Override
 public void run() {

 if (AsyncTaskWithTimer.this != null
 &amp;&amp; AsyncTaskWithTimer.this.getStatus() != Status.FINISHED)
 AsyncTaskWithTimer.this.cancel(true);
 handler.removeCallbacks(this);
 Looper.myLooper().quit();
 }
 }, HTTP_REQUEST_TIMEOUT);

 Looper.loop();
 }
 };
 timeout.start();
}

abstract protected Result doInBackgroundImpl(Params... params);
}
</code></pre>

A Sample for this

<pre><code>public class AsyncTaskWithTimerSample extends AsyncTaskWithTimer&lt;Void, Void, Void&gt; {

 @Override
 protected void onCancelled(Void void) {
 Log.d(TAG, "Async Task onCancelled With Result");
 super.onCancelled(result);
 }

 @Override
 protected void onCancelled() {
 Log.d(TAG, "Async Task onCancelled");
 super.onCancelled();
 }

 @Override
 protected Void doInBackgroundImpl(Void... params) {
 // Do background work
 return null;
 };
 }
</code></pre>

blocks|key|1255475|text|我可以通过添加一行简单的代码来解决类似的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1255476|HttpURLConnection+hConn+=+(HttpURLConnection)+url.openConnection();
hConn.setRequestMethod("HEAD");|code-block|syntax|javascript|1255477|我的要求是知道响应代码，为此，仅获取元信息就足够了，而不是获得完整的响应正文。|1255478|默认的请求方法是GET，这需要很长时间才能返回，最后抛出了SocketTimeoutException。当我将请求方法设置为HEAD时，响应非常快。|1255479|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I could get solution for such a similar problem with addition of a simple line

<pre><code>HttpURLConnection hConn = (HttpURLConnection) url.openConnection();
hConn.setRequestMethod("HEAD");
</code></pre>

My requirement was to know the response code and for that just getting the meta-information was sufficient, instead of getting the complete response body. 

Default request method is GET and that was taking lot of time to return, finally throwing me SocketTimeoutException. The response was pretty fast when I set the Request Method to HEAD.

I want to return false if the URL takes more then 5 seconds to connect - how is this possible using Java? Here is the code I am using to check if the URL is valid

<pre><code>HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
con.setRequestMethod("HEAD");
return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
</code></pre>

HttpURLConnection timeout settings

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如果URL的连接时间超过5秒，我想返回false -使用Java怎么可能做到这一点？下面是我用来检查URL是否有效的代码HttpURLConnection.setFollowRedirects(false);HttpURLConnection con = (HttpURLConnection) new URL(url)...

问HttpURLConnection超时设置
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