HttpURLConnection超时设置

Question

如果URL连接超过5秒,我想返回false - 使用Java可以实现这一点吗？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);

Answer 1

HttpURLConnection有一个setConnectTimeout方法.

只需将超时设置为5000毫秒,然后捕获 java.net.SocketTimeoutException

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;
}

Answer 2

你可以像这样设置超时,

con.setConnectTimeout(connectTimeout);
con.setReadTimeout(socketTimeout);