Writing to files on a server

[SomeDude]

Hi, I have a question on file writing. I am not very experienced in
Java programming. My hobby right now is to write an applet where 2
persons could play Go together (it is a board game). The offline
interface is done but I was wondering how to send information between
the two players. Since I am not very experienced in Java and I am just
a hobby programmer, I found that programming a port listening
interface was too difficult. My idea was to write the moves the player
made in a text file on the server of my web page (I use prohosting, a
free server). The problem is that I get a
java.security.AccessControlException: access denied error everytime I
try to write to the file. It also does the same thing if I run the
applet on my computer. Do I have to get a certificate to write on the
server? I do not wish to write files on the user's computer, only on
my free server. Is it possible to do this? Thank you

Some Dude

[Christopher Vagnetoft]

I may be wrong, but i don't think applets has got access to the FS... for
security reasons...

// Christopher

"SomeDude" <ra*******@hotmail.com> skrev i meddelandet
news:71*************************@posting.google.co m...

Hi, I have a question on file writing. I am not very experienced in
Java programming. My hobby right now is to write an applet where 2
persons could play Go together (it is a board game). The offline
interface is done but I was wondering how to send information between
the two players. Since I am not very experienced in Java and I am just
a hobby programmer, I found that programming a port listening
interface was too difficult. My idea was to write the moves the player
made in a text file on the server of my web page (I use prohosting, a
free server). The problem is that I get a
java.security.AccessControlException: access denied error everytime I
try to write to the file. It also does the same thing if I run the
applet on my computer. Do I have to get a certificate to write on the
server? I do not wish to write files on the user's computer, only on
my free server. Is it possible to do this? Thank you

Some Dude

[Stephen Gilbert]

Hi,

Applets are downloaded and run on the user's local machine;
they can't write files on the server, because they are not
running on the server. However, you could use a CGI program
or a servlet, running on the server, and have your applet
send the data back to the program running on the server,
and then have that program write the data.

You won't have any luck trying to use ports (sockets)
between the two applets, because applets are prohibited
from connecting to hosts other than the host that served
the applet.

--Steve

ra*******@hotmail.com (SomeDude) wrote in message news:<71*************************@posting.google.c om>...

Hi, I have a question on file writing. I am not very experienced in
Java programming. My hobby right now is to write an applet where 2
persons could play Go together (it is a board game). The offline
interface is done but I was wondering how to send information between
the two players. Since I am not very experienced in Java and I am just
a hobby programmer, I found that programming a port listening
interface was too difficult. My idea was to write the moves the player
made in a text file on the server of my web page (I use prohosting, a
free server). The problem is that I get a
java.security.AccessControlException: access denied error everytime I
try to write to the file. It also does the same thing if I run the
applet on my computer. Do I have to get a certificate to write on the
server? I do not wish to write files on the user's computer, only on
my free server. Is it possible to do this? Thank you

Some Dude

[Chris Harbert]

I just had to make a client/server Go game for one of my classes. The
solution we chose was to give the client Java applications via Java
Web Start and then use Java RMI to get the clients to talk to the
server. This worked pretty well.

If you want to use applets I agree with Steve that the best way to go
is to write a servlet. This will mean you need a servlet container
(e.g. Tomcat), which may be why Steve mentioned CGI.

Chris

sg******@occ.cccd.edu (Stephen Gilbert) wrote in message news:<56**************************@posting.google. com>...

Hi,

Applets are downloaded and run on the user's local machine;
they can't write files on the server, because they are not
running on the server. However, you could use a CGI program
or a servlet, running on the server, and have your applet
send the data back to the program running on the server,
and then have that program write the data.

You won't have any luck trying to use ports (sockets)
between the two applets, because applets are prohibited
from connecting to hosts other than the host that served
the applet.

--Steve

ra*******@hotmail.com (SomeDude) wrote in message news:<71*************************@posting.google.c om>...

Hi, I have a question on file writing. I am not very experienced in
Java programming. My hobby right now is to write an applet where 2
persons could play Go together (it is a board game). The offline
interface is done but I was wondering how to send information between
the two players. Since I am not very experienced in Java and I am just
a hobby programmer, I found that programming a port listening
interface was too difficult. My idea was to write the moves the player
made in a text file on the server of my web page (I use prohosting, a
free server). The problem is that I get a
java.security.AccessControlException: access denied error everytime I
try to write to the file. It also does the same thing if I run the
applet on my computer. Do I have to get a certificate to write on the
server? I do not wish to write files on the user's computer, only on
my free server. Is it possible to do this? Thank you

Some Dude

[Ben Childs]

SomeDude wrote:

Hi, I have a question on file writing. I am not very experienced in
Java programming. My hobby right now is to write an applet where 2
persons could play Go together (it is a board game). The offline
interface is done but I was wondering how to send information between
the two players. Since I am not very experienced in Java and I am just
a hobby programmer, I found that programming a port listening
interface was too difficult. My idea was to write the moves the player
made in a text file on the server of my web page (I use prohosting, a
free server). The problem is that I get a
java.security.AccessControlException: access denied error everytime I
try to write to the file. It also does the same thing if I run the
applet on my computer. Do I have to get a certificate to write on the
server? I do not wish to write files on the user's computer, only on
my free server. Is it possible to do this? Thank you

Some Dude

you could write a program to run on the server that is your "go server"
that will take clients and connect them together. the applet would be
the client. The only problem with this method would be that you would
have to be able to have the program running on the server...

-Ben

[SomeDude]

Thank you everyone for your awnsers. All of this sounds too
complicated... I just wished there was an easy way to do what I want
to do. I guess I'll find a new hobby now, leaving my Go applet forever
unfinished. If you want to see what I did, go to
earth.prohosting.com/playgo. Thanks

Olivier

sg******@occ.cccd.edu (Stephen Gilbert) wrote in message news:<56**************************@posting.google. com>...

Hi,

Applets are downloaded and run on the user's local machine;
they can't write files on the server, because they are not
running on the server. However, you could use a CGI program
or a servlet, running on the server, and have your applet
send the data back to the program running on the server,
and then have that program write the data.

You won't have any luck trying to use ports (sockets)
between the two applets, because applets are prohibited
from connecting to hosts other than the host that served
the applet.

--Steve

ra*******@hotmail.com (SomeDude) wrote in message news:<71*************************@posting.google.c om>...

Hi, I have a question on file writing. I am not very experienced in
Java programming. My hobby right now is to write an applet where 2
persons could play Go together (it is a board game). The offline
interface is done but I was wondering how to send information between
the two players. Since I am not very experienced in Java and I am just
a hobby programmer, I found that programming a port listening
interface was too difficult. My idea was to write the moves the player
made in a text file on the server of my web page (I use prohosting, a
free server). The problem is that I get a
java.security.AccessControlException: access denied error everytime I
try to write to the file. It also does the same thing if I run the
applet on my computer. Do I have to get a certificate to write on the
server? I do not wish to write files on the user's computer, only on
my free server. Is it possible to do this? Thank you

Some Dude

Th