java - HttpURLConnection 超时设置

Question

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);

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;
}