url - Proxy Check in Java -

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i try check if proxy online or not. everytime exception thrown. tried system.setproperty (), doesn't work either...

my method:

public static boolean isonline(string host, int port) {     string url = "http://www.google.com";     try     {         proxy proxy = new proxy(proxy.type.http, new inetsocketaddress(host, port));         httpurlconnection connection = (httpurlconnection) new url(url).openconnection(proxy);         connection.connect();         return true;      } catch (exception e)     {         return false;     } }

the exception:

java.net.connectexception: connection refused: connect @ java.net.dualstackplainsocketimpl.connect0(native method) @ java.net.dualstackplainsocketimpl.socketconnect(dualstackplainsocketimpl.java:79) @ java.net.abstractplainsocketimpl.doconnect(abstractplainsocketimpl.java:345) @ java.net.abstractplainsocketimpl.connecttoaddress(abstractplainsocketimpl.java:206) @ java.net.abstractplainsocketimpl.connect(abstractplainsocketimpl.java:188) @ java.net.plainsocketimpl.connect(plainsocketimpl.java:172) @ java.net.socket.connect(socket.java:589) @ java.net.socket.connect(socket.java:538) @ sun.net.networkclient.doconnect(networkclient.java:180) @ sun.net.www.http.httpclient.openserver(httpclient.java:432) @ sun.net.www.http.httpclient$1.run(httpclient.java:484) @ sun.net.www.http.httpclient$1.run(httpclient.java:482) @ java.security.accesscontroller.doprivileged(native method) @ sun.net.www.http.httpclient.privilegedopenserver(httpclient.java:481) @ sun.net.www.http.httpclient.openserver(httpclient.java:522) @ sun.net.www.http.httpclient.<init>(httpclient.java:211) @ sun.net.www.http.httpclient.new(httpclient.java:308) @ sun.net.www.http.httpclient.new(httpclient.java:326) @ sun.net.www.protocol.http.httpurlconnection.getnewhttpclient(httpurlconnection.java:1167) @ sun.net.www.protocol.http.httpurlconnection.plainconnect0(httpurlconnection.java:1146) @ sun.net.www.protocol.http.httpurlconnection.plainconnect(httpurlconnection.java:997) @ sun.net.www.protocol.http.httpurlconnection.connect(httpurlconnection.java:931) @ viewer.proxycheck.isonline(proxycheck.java:18) @ viewer.viewer.main(viewer.java:7)

thanks time!

try this:

public static boolean isonline(){     system.setproperty("http.proxyhost", "failproxyip");     system.setproperty("http.proxyport", "failproxyport");     try {         httpurlconnection connection = (httpurlconnection)new url("http://www.google.com").openconnection();         connection.connect();         return true;     } catch (exception e) {         return false;     } }  public static void main(string[] args) {     system.out.println(isonline()); //prints false }

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