Name: dbT83986 Date: 06/09/99
=20
ENVIRONMENT:
------------
Connection to Internet via (MS-)Proxy-Server,=20
Proxy-Authorization is needed.
When i try to connect() to a FTP-URL i get the
UnknownHostException.
Connecting to the same Host with a http:// URL
does work.
Connecting to the FTP-URL via Internet-Explorer
does work too.
ERROR MESSAGES
----------------
D:\Projekte\install>d:\app\jdk121\bin\java GetURLshort ftp://ftp.mathematik=
.uni-halle.de
java.net.UnknownHostException: ftp.mathematik.uni-halle.de
at java.net.InetAddress.getAllByName0(Compiled Code)
at java.net.InetAddress.getAllByName0(InetAddress.java:544)
at java.net.InetAddress.getByName(Compiled Code)
at java.net.Socket.<init>(Socket.java:98)
at sun.net.NetworkClient.doConnect(NetworkClient.java:54)
at sun.net.NetworkClient.openServer(NetworkClient.java:42)
at sun.net.ftp.FtpClient.openServer(FtpClient.java:271)
at sun.net.ftp.FtpClient.<init>(FtpClient.java:385)
at sun.net.www.protocol.ftp.FtpURLConnection.connect(FtpURLConnecti=
on.java:82)
at GetURLshort.openURLForInput(GetURLshort.java:68)
at GetURLshort.doit(Compiled Code)
at GetURLshort.main(GetURLshort.java:22)
THE following does work:
----------------------
D:\Projekte\install>d:\app\jdk121\bin\java GetURLshort http://ftp.mathemati=
k.uni-halle.de
<HTML><HEAD>
<TITLE>Department of Mathematics and Computer Science</TITLE>
</HEAD>
<BODY background=3D"/icons/siegrely.jpg">
<B>
<FONT SIZE=3D"+1">
<A HREF=3D"http://www.uni-halle.de/">
Martin-Luther-Universit=E4t Halle-Wittenberg</A><BR>
</FONT>
<FONT SIZE=3D"+2">
Department of Mathematics and Computer Science<BR>
</FONT>
</B>
<HR>
<h2>The WWW-Server www.mathematik.uni-halle.de has moved to
<p>
<a href=3D"http://www.mathematik.uni-halle.de">www.mathematik.uni-halle.de<=
/a>
<p>
</h2>
</BODY></HTML>
------------------
EXAMPLE PROGRAM
-------------------
// GetURLshort.java
//
import java.util.Properties;
import java.net.*;
import java.io.*;
public class GetURLshort {
URLConnection conn =3D null;
public static void main (String args[]){
GetURLshort a =3D new GetURLshort();
=09 if( args.length<1 )
=09 {
=09=09System.err.println("Usage: GetURLshort http://xx.yy.zz");
=09=09return;
=09 }
a.doit(args);
}
public void doit(String args[]) {
Properties systemSettings =3D System.getProperties();
=09 systemSettings.put("proxySet", "true");
=09 systemSettings.put("proxyHost", "999.99.999.99");=20
=09 systemSettings.put("proxyPort", "9999");
=09 System.setProperties(systemSettings);
try {
=09 URL url =3D new URL(args[0]);
BufferedInputStream in =3D new BufferedInputStream(
openURLForInput(url));
=09 BufferedOutputStream out =3D new BufferedOutputStream(
=09 =09new FileOutputStream ( java.io.FileDescriptor.out ));
byte[] bytes_read =3D new byte[1024];
int nr_bytes_read;
while ((nr_bytes_read =3D in.read(bytes_read,0,bytes_read.length )) =
> 0) {
out.write(bytes_read, 0, nr_bytes_read);
}
=09=09out.flush();
=09=09out.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
public InputStream openURLForInput (URL url)
throws IOException {
conn =3D url.openConnection();
conn.setDoInput (true);
=09 String encoded =3D new String("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=
"); =20
=09 conn.setRequestProperty("Proxy-Authorization", "Basic " + encoded);
conn.connect ();
return conn.getInputStream();
}
}
----------
VERSION
----------
D:\Projekte\install>d:\app\jdk121\bin\java -version
java version "1.2.1"
Classic VM (build JDK-1.2.1-A, native threads)
D:\Projekte\\install>d:\app\jdk121\bin\java -fullversion
java full version "JDK-1.2.1-A"
----------
EOF
----------
(Review ID: 84138)=20
======================================================================