我试图检查website
是否在线。我已经尝试过这样的:检查网站是否在线
public static boolean checkisonline(String targetUrl) {
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
HttpURLConnection httpUrlConn;
try {
httpUrlConn = (HttpURLConnection) new URL(targetUrl)
.openConnection();
httpUrlConn.setRequestMethod("HEAD");
// Set timeouts in milliseconds
httpUrlConn.setConnectTimeout(30000);
httpUrlConn.setReadTimeout(30000);
// Print HTTP status code/message for your information.
System.out.println("Response Code: "
+ httpUrlConn.getResponseCode());
System.out.println("Response Message: "
+ httpUrlConn.getResponseMessage());
return (httpUrlConn.getResponseCode() == HttpURLConnection.HTTP_OK);
} catch (Exception e) {
System.out.println("Error: " + e.getMessage());
return false;
}
}
但我总是得到Error: null
在输出中,即使该网站是在线。
Stackdrace:
03-05 14:51:30.931 8409-8460/de.treevo.app I/System.out﹕ Error: null 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ java.io.EOFException 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at java.util.zip.GZIPInputStream.readFully(GZIPInputStream.java:202) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:98) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:81) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.initContentStream(HttpEngine.java:468) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:666) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:347) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:503) 03-05 14:51:30.931 8409-8460/de.treevo.app W/System.err﹕ at de.treevo.core.functions.checkisonline(functions.java:79) 03-05 14:51:30.941 8409-8460/de.treevo.app W/System.err﹕ at de.treevo.app.add_series$1.run(add_series.java:167) 03-05 14:51:30.941 8409-8460/de.treevo.app W/System.err﹕ at java.lang.Thread.run(Thread.java:841)
网站表示净可用与否?类似的东西? – Piyush
不,这意味着例如google.com是否可达 – ternes3
请发布完整的例外,包括堆栈跟踪。 –