Help on URLConnection.getOutputStream() !!

Hi,
I dun understand why this code returns me an empty string...
URL url = new URL ("http://localhost");
URLConnection con = url.openConnection();
con.setDoOutput(true);
OutputStream os = con.getOutputStream();
System.out.println( os.toString() );
This is juz part of my code.... I got an error while trying to write.... And i found out that the error is here... It should return me a OutputStream object.... but when i tried OutputStream object.toString()... it returns me an empty string...
Can anyone please help me??

Hi,
I'm dealing with a similar problem with an Outputstream ...
Im trying to tunnel data thru the URLConnection ....
when sending the data I have no problems, but when i want to send it to a remote host i get the following exception:
java.io.IOException: Error writing to server
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:269)
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:277)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:564)
at graphit.gojaplugins.ntrenderplugin.client.Publisher.send(Publisher.java:205)
at graphit.gojaplugins.ntrenderplugin.client.Publisher.netCopy(Publisher.java:136)
at graphit.gojaplugins.ntrenderplugin.client.PublishDialog$PublishRunner.run(PublishDialog.java:573)
at java.lang.Thread.run(Thread.java:536)
here is the code of my send Method:
int contentLength = data.length;
/* http://medusa:8080/servlet/goja/framework/servlet/GeodataPublisher */
try {
// diese Zeile wirft warnings beim compile, URLEncoder.encode(....) ist deprecated k�mmere mich um dieses Problem sp�ter
// das hat wohl irgendwie mit den Zeichens�tzen bei verschiedenen Sprachumgebungen zu tun.
String url = "http://hades:8080/servlet/graphit/gojaplugins/ntrenderplugin/server/GeodataPublisher?sourceFile="+ URLEncoder.encode(source) + "&multipart=" + multipart + "&username=" + URLEncoder.encode(this.username) + "&password=" + URLEncoder.encode(this.password) + "&lastPart="+URLEncoder.encode(""+lastPart)+"&isShared="+isShared+"&isGeoset="+isGeoset+"&gstName="+URLEncoder.encode(geosetName);
URL serverURL = new URL(url);
URLConnection con = serverURL.openConnection();
//System.out.println( serverURL.toString() );
//System.out.println(con.toString());
con.setUseCaches(false);
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestProperty("Content-Type", "multipart/form-data");
con.setRequestProperty("Content-Length","" + contentLength);
//con.connect();
System.out.println("permission necessary: "+con.getPermission());
OutputStream out = con.getOutputStream();
out.write(data);
out.flush();
out.close();
InputStream in = con.getInputStream();
int returnCode = in.read();
con = null;
serverURL = null;
in.close();
System.out.println("returncode " + returnCode);
//TODO: hier m�ssen die Returncodes des Servers behandelt werden!!!
if (returnCode == 92) throw new RenderPluginException(RenderPluginException.AUTHENTIFICATIONFEHLER_BEIM_PUBLISHING);
if (returnCode == 91) throw new RenderPluginException(RenderPluginException.SERVER_CHECKWRITEACCESS_FAILED);
if (returnCode == 90) throw new RenderPluginException(RenderPluginException.SERVER_INTERNAL_IO_ERROR);
}catch (IOException ioe) {
Some words about the server side: As server I have an Apache Tomcat Servlet Container, which
handles my request ....
Unfortunately I can't use any other protocol than http for transferring my data ...
Maybe there is someone who can help me ....

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Dear All,
I am trying to zip a file in the client side and sending it to the server side machine......there, i am trying to unzip it and writting it over there...for this, i am using a seperate program in the client side and in the server side.................................
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only if i use the above code, the zipped file is transfered to my server machine...but in this case, the link with the server is not getting disconnected...i mean the command prompt remains alive, without stopping...what i inferred is, my control is got into the above said "InputStream in = urlconnection.getInputStream();"...indefinitely...
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any suggestions please...waiting for the reply very anxiously, refreshing this site for every 2 minutes....
sakthivel s.
snippet code for ur reference...
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java.security.AccessControlException: access denied (java.net.SocketPermission site:80 connect,resolve)
What should I do to resolve this error. Sorry for being such a noob but do not have much info about this.

How to writing an image from my applet to my apache webserver

hi everyone,
i have a big problem, writing an image from my applet to my apache
webserver. i tried three way's of writing that file. every way was
described in forums to solve this problem, but non of them worked and
i don't know why. i'll give you the code of my writing-methods and
describe, what happen when i test them, in order someone of you can
give me an usefull tip, where the problem is.
as inputparameter i give my method a new URL referring to
http://localhost/test.jpg (this is the same directory, where my applet
is loaded from, so i should have reading and writing permission,
havn't i? while i'm developing, my applet runs on the same pc as my
webserver, just in case you're wondering about localhost) and a
selfmade BufferedImage (i already testet if it is not null and shows
the correct things ... all ok).
1. try:
private void writeImageToServer(URL fileURL,BufferedImage img){
try {
URLConnection urlConnection = fileURL.openConnection();
urlConnection.setDoOutput(true);
OutputStream urlout = urlConnection.getOutputStream();
BufferedOutputStream out = new BufferedOutputStream(urlout);
ImageIO.write(img,"jpg",out);
out.close(); // i also tried without this line -> same result
// additionally a question: do i need
out.close()?
catch( IOException e ){
e.printStackTrace();
result:
test.jpg doesn't appear in the webroot. but some very strange messages
in the error.log of my apacheserver:
[Tue Jun 08 11:40:22 2004] [error] [client 127.0.0.1] File does not
exist: c:/programme/apache
group/apache/htdocs/meta-inf/services/javax.imageio.spi.ImageOutputStreamSpi
[Tue Jun 08 11:40:22 2004] [error] [client 127.0.0.1] File does not
exist: c:/programme/apache
group/apache/htdocs/meta-inf/services/javax.imageio.spi.ImageReaderSpi
[Tue Jun 08 11:40:22 2004] [error] [client 127.0.0.1] File does not
exist: c:/programme/apache
group/apache/htdocs/meta-inf/services/javax.imageio.spi.ImageInputStreamSpi
[Tue Jun 08 11:40:22 2004] [error] [client 127.0.0.1] File does not
exist: c:/programme/apache
group/apache/htdocs/meta-inf/services/javax.imageio.spi.ImageWriterSpi
[Tue Jun 08 11:40:22 2004] [error] [client 127.0.0.1] File does not
exist: c:/programme/apache
group/apache/htdocs/meta-inf/services/javax.imageio.spi.ImageTranscoderSpi
i cannot explain this lines to myself, because my apache should have
nothing to do with java. all my javacode is executed on the client
side in the browser. do this messages mean i have to add the ImageIO
package from the sdk to my jar-applet. the jre, used by my iexplorer,
doesn't contain this files in the meta-inf/services directory of
rt.jar, but that's version 1.4.2_03, the same as my sdk, and the
rt.jar contains the corresponding classfiles at javax.imageio.spi. so
i'm realy confused by this messages.
2. try:
private void writeImageToServer(URL fileURL,BufferedImage img){
try {
URLConnection urlConnection = fileURL.openConnection();
urlConnection.setDoOutput(true);
OutputStream urlout = urlConnection.getOutputStream();
BufferedOutputStream out = new BufferedOutputStream(urlout);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(img);
out.close(); // same comments as above
catch( IOException e ){
e.printStackTrace();
result:
nothing. no error-messages in the error.log, no exceptions in the
java-console and no test.jpg in the webroot. i searched my whole
harddrives for it: nothing. isn't this the way, the JPEGImageEncoder
works?
3. try:
private void writeImageToServer(URL fileURL,BufferedImage img){
try {
File file = new File(fileURL.toString);
file.createNewFile();
BufferedOutputStream out = new BufferedOutputStream(new
FileOutputStream(file));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(img);
out.close(); // same comments as above
catch( Exception e ){
e.printStackTrace();
result:
the SecurityManager denies this action with "access denied" while
calling createNewFile(). well, this way was dedicated to run from an
application, not from an applet. i'd have to sign my applet to get the
rights to do this, or i can edit java.policy on my client, what i
don't want, because i cannot do this on every client, the applet will
run, when i'm finished with it. this brings me to the question: does
anybody know's how to sign my applet and give it full access to the
harddrive and the webserver without paying 400$ to VeriSign for a
commercial CA? i want to do this by myself, without paying anything
and without giving a lot of information to another company.
i would realy appreciate, if someone could give me a hint where i am
wrong or how to do this correct.
thank you very much
[email protected]

You hold several misconceptions. The first is that an applet can write to a server without help from the server. That will never work on a real server (though it might work in testing, if the server is on the same PC as the applet). Applets cannot get a File object that points to any place on the server.
If you write a servlet designed for accepting image uploads, the applet can communicate back to that servlet and feed it the bytes of the image. There are other technologies that can replace the servlet, of course (PHP, ASP..) but I mention that because you say you are running Apache - and that is very Java oriented.
For more help on servlets, try the [Web Tier APIs - Java Servlet|http://forums.sun.com/forum.jspa?forumID=33] forum.

Help on URLConnection.getOutputStream() !!

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