Java HttpURLConnection 超时设置
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HttpURLConnection timeout settings
提问by Malachi
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
如果 URL 连接时间超过 5 秒，我想返回 false - 这怎么可能使用 Java？这是我用来检查 URL 是否有效的代码
HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
con.setRequestMethod("HEAD");
return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
采纳答案by dbyrne
HttpURLConnectionhas a setConnectTimeoutmethod.
HttpURLConnection有一个setConnectTimeout方法。
Just set the timeout to 5000 milliseconds, and then catch java.net.SocketTimeoutException
只需将超时设置为 5000 毫秒，然后捕获 java.net.SocketTimeoutException
Your code should look something like this:
您的代码应如下所示：
try {
HttpURLConnection.setFollowRedirects(false);
HttpURLConnection con = (HttpURLConnection) new URL(url).openConnection();
con.setRequestMethod("HEAD");
con.setConnectTimeout(5000); //set timeout to 5 seconds
return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
} catch (java.net.SocketTimeoutException e) {
return false;
} catch (java.io.IOException e) {
return false;
}
回答by ZZ Coder
You can set timeout like this,
你可以像这样设置超时，
con.setConnectTimeout(connectTimeout);
con.setReadTimeout(socketTimeout);
回答by Ayman Mahgoub
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
如果 HTTP 连接没有超时，您可以在后台线程本身（AsyncTask、Service 等）中实现超时检查器，以下类是自定义 AsyncTask 的示例，它在一定时间后超时
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);
}
A Sample for this
一个示例
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;
};
}
回答by Subrata Nath
I could get solution for such a similar problem with addition of a simple line
我可以通过添加一条简单的行来解决此类类似问题
HttpURLConnection hConn = (HttpURLConnection) url.openConnection();
hConn.setRequestMethod("HEAD");
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.
我的要求是知道响应代码，为此只获取元信息就足够了，而不是获取完整的响应正文。
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.
默认请求方法是 GET，这需要花费很多时间才能返回，最后抛出 SocketTimeoutException。当我将请求方法设置为 HEAD 时，响应非常快。
