如何解决在Java中检查URL的存在而无需打开浏览器
| 我想检查网址的存在,并尝试在Java中使用以下代码,public boolean exists(String URLName) {
try {
if (!URLName.toUpperCase().contains(\"HTTP\"))
URLName=\"http://\"+URLName;
URL url = new URL(URLName);
System.setProperty(\"java.net.useSystemProxies\",\"true\");
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
urlConn.setConnectTimeout(9000);
urlConn.setReadTimeout(9000);
urlConn.connect();
if(HttpURLConnection.HTTP_OK == urlConn.getResponseCode())
return true;
else
return false;
}
catch (SocketTimeoutException e){
return false;
}
catch (Exception e) {
e.printStackTrace();
return false;
}
}
上面的代码在Windows中工作正常,但是当代码通过服务器(linux)运行时,我收到以下错误消息,
GConf Error: Failed to contact configuration server; some possible
causes are that you need to enable TCP/IP networking for ORBit,or
you have stale NFS locks due to a system crash. See
http://projects.gnome.org/gconf/ for information. (Details - 1:
Not running within active session)
GConf Error: Failed to contact configuration server; some possible
causes are that you need to enable TCP/IP networking for ORBit,or
you have stale NFS locks due to a system crash. See
http://projects.gnome.org/gconf/ for information. (Details - 1:
Not running within active session)
java.net.UnknownHostException: www.ep.gov
at
java.net.PlainSocketImpl.connect(PlainSocketImpl.j ava:177)
at
java.net.SocksSocketImpl.connect(SocksSocketImpl.j ava:366)
at java.net.Socket.connect(Socket.java:525)
at sun.net.NetworkClient.doConnect(NetworkClient.java :158)
at
sun.net.http://www.http.HttpClient.openServe...lient.java:394)
at
sun.net.http://www.http.HttpClient.openServe...lient.java:529)
at sun.net.www.http.HttpClient.<init>(HttpClient.java :233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at
sun.net.http://www.protocol.http.HttpURLConn...ction.java:860)
at
sun.net.http://www.protocol.http.HttpURLConn...ction.java:801)
at
sun.net.http://www.protocol.http.HttpURLConn...ction.java:726)
我从服务器管理员收到以下消息
It is working,while it was run in X session (GUI Mode).
But it is not working in non-GUI mode. Please try to change the coding to make use of non-GUI mode.\" It seems the above code is making use of GUI mode.
我需要一个备用代码来检查URL是否存在,而无需使用GUI。
问候
琳达
解决方法
“ 3”表示请求未到达其目的地。可能有很多原因导致linux服务器无法到达所需的URL
www.ep.gov
。
请确保服务器可以访问URLwww.ep.gov
。
, 我认为您的问题出在这条线上:
System.setProperty(\"java.net.useSystemProxies\",\"true\");
看来这导致系统尝试为Web浏览器查找HTTP代理配置,并最终导致Gnome配置出现一些问题。
您实际上是否需要使用HTTP代理?如果没有,只需删除该行。如果这样做,请阅读此页面以了解如何配置代理。
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