'Browse' from an applet

Hello again! I have an applet in a JSP which runs on tomcat server. Is there any way to have a button in the applet which opens a 'Browse' dialog, where to select a file (any type) and send it to the server? Or JavaScript is the only solution?
Mihai

To do that in the applet, you need to sign the applet. But you can do it with a plain old-fashioned html form.
Javascript is in no way necessary.
Whatever way you choose to send the file from the client, you do of course need something on the server to take care of it. If you use a HTML form, and since you have a tomcat server there, the best is to make a servlet using the com.oreilly.servlet package. (Google for it for details.)

Similar Messages

Opening a browser from an applet

I got a problem, I want to open a browser from my applet, but I just found one way:
getAppletContext().showDocument(new URL(
"http://www.java.sun.com"), "_blank");
but the problem is: with this, the default browser with defaul settings is opened, and that's what I don't want...
how can I open the browser with some settings (for example size, or no-url-bar, etc)
thx for help

hi,
try this code:
public void showDocument(java.net.URL url, String targetWindow)
when targetWindow can be:
"_blank" Display the document in a new, nameless window.
"windowName" Display the document in a window named windowName. This window is created if necessary.
"_self" Display the document in the window and frame that contain the applet.
"_parent" Display the document in the applet's window but in the parent frame of the applet's frame. If the applet frame has no parent frame, this acts the same as "_self".
"_top" Display the document in the applet's window but in the top-level frame. If the applet's frame is the top-level frame, this acts the same as "_self".

Closing Web Browser from an Applet

Does anyone knows how to close the Web Browser from an Applet ?
Also Is there a way to close a browser which is intantiated from using ApplteContext ().showDocument ("....","_Blank").
Thanks
Sohan

Hi kavinjir!
Using class netscape.javascript.JSObject is possible to interact with javascript which can easily close the window browser but I'm afraid about the newest one because it isn't a child window. If this newest window contains an applet both (applets) can interact and send/receive "messages" to trigger an event (e.g; close via javascript again).
Best Regards.

How to close the browser from an Applet?

Hi,
I've written one applet, with 2 buttons (Continue & Exit). On click of Continue button, it will open another web page. On click of Exit button, the browser should be closed.
I'm not able to close the browser from the applet.
Can any body help me.
Rgds
Santosh

In my experience, calling Javascript from applets is flaky at best. However, I have gotten it to work in some cases. The following code should get you started:
netscape.javascript.JSObject win = netscape.javascript.JSObject.getWindow(applet);
Now you can call different methods on the win object (look into Javascript documentation for details).
It also depends on if you are using the Java Plug-in or the JVM built into the web browser. You probably need set MAYSCRIPT=TRUE in your HTML. Look into the Java Plug-in documentation for details...

Can you disable the status bar on a web browser from an applet?

I have a signed applet and am using plugin 1.3.1_02 with IE 5.5. I use the showStatus("text") method to display pertinent information to the user in the browser's status bar.
Currently I see all types of messages being displayed (in IE's status bar) as my applet communicates with the server. I would like to restrict what is shown in the status bar to show my system messages only.
Can I filter what is displayed or disable status bar functionality programmatically from the applet? Or possibly with a browser/plugin setting?
Thanks

Hi,
I think you can do that with Java to JavaScript communication.
thanks,
Srinivas.

Redirecting browser from an applet with POST

Hi,
How can I cause an applet to redirect a browser window using a POST request?
Thanx,
Yaron

redirect using postIf you mean send a post request and let the http resonese redirect the page then
you have 2 options.
1.
set values of html object from the applet (calling javascript):
this.getAppletContext().showDocument(
new URL("javascript: someJSFunction('param','param');"));Submit the form from the applet calling javascript (see above).
Note that I don't use JSObject since that one makes mozilla crash since jre 1.5
2.
Use URL and URLConnection to POST your data.
Then use this.getAppletContext().showDocument() to navigate the the redirected URL (according to response from the URLConnection)
Using POST:
http://forum.java.sun.com/thread.jspa?threadID=645830&messageID=3816955
3rd post

Can i open a page in Browser from an applet

i want to open a web site in a new browser window from an applet.
Is it possible. if posible then send me some links or codes
thank you

Do you know how to use applet to link to another webpage? set the target = _blank
public class App extends Applet {
getAppletContext().showDocument(new URL("http://java.sun.com"),"_blank");
}

Open a Specific browser from an applet

We can open a browser using appletContext().showDocument() Or even using Runtime.getRuntime().exec(rundll32,url.dll,FileProtocolHandler),
but how can i specify a specific browser in applet. I have an application which works only in IE.

You can't open a specific browser (if the applet is unsigned), and what's the problem with showDocument()?
The need for this is unclear to me.

Closing browser window from an Applet?

I've written a series of applets that perform different functions. I placed a button on each applet with the purpose to close the window in which that applet is running. However I don't even know where to start looking to find out how to make my applet close it's own browser window. I know how to open a new browser window from an applet but not vice versa.
Can anyone help please?
Mark.

Right, I sort of tracked down some code that uses getMethods to allow me to invoke a Javascript command. It is not pretty and took a little bit of editing to get to work but it does the job without putting JS stuff into my HTML.
However it is causing some problems. If I open one of my other applets it will only let me close that window and the previous applets ceases to respond at all. I think this may be because the invoke gets the JSObject which is the window and somehow having more than one applet open in different windows is causing it to get confused and is locking the first window and only responding to the second.
I have seen a much simpler method that uses:
import netscape.javascript.*;
and JSObject to get the window but my compiler complains about the import. Any further suggestions or an example would be welcome as my current solution is a bit limited as you can effectively only have one window open at a time which doesn't suit my needs.
Many thanks.
Mark.

Problem in Closing Browser window from an Applet.

I have wriiten a small Applet progarm that calls a Javascript function in the opening window, to close the window in which it is loaded.The Applet window is a PopUp window from one of my application's window.
First time I start my application and load that Applet and then close the frame window,it works fine that the browser window will close, when the frame window is closed.It calls the window closing event in that applet stop method is called and In stop methd a closeLaunchedBrowser method will called this has a Javascript method and the Method closes the window using the self.close() method.
But now if I continue this process of launching applet and then closing frame window, initial 1 or 2 steps it has know problem when I continue this, after 3 or 4 steps, it result in browser hang/crash.
I am using java version 1.4.2_01 or higher and IE or Firefox(any other NetScape based) browser to load applet.It works fine with IE but getting problem in case of Firefox(any other NetScape based).
The error dialog information and related event log generated is shown below :
The dialog which is displayed before crashing of firefox has information :
"firefox.exe has generated errors and it will closed by windows.you will need to restart the program.
An error log is being created."
The error log information :
Source : Browser Event ID: 8032
"The browser service has failed to retrieve the backup list too many times on transport \Device\NetBT_Tcpip_{611A64A2-8F4B-409E-9AB2-0D9BF741E791}. The backup browser is stopping.
The code related to this is given below.
import javax.swing.JApplet;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import netscape.javascript.JSObject;
public class TestApplet extends JApplet {
protected JSObject win = null;
private JFrame frame = null;
private boolean alreadyClosed = false;
public void init(){
this.win = JSObject.getWindow(this);
frame = new JFrame("Test Frame");
frame.setSize(300, 400);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.out.println("windowClosing");
TestApplet.this.stop();
frame.show();
public void stop() {
if (!alreadyClosed) {
alreadyClosed = true;
closeLaunchedBrowser();
System.gc();
System.runFinalization();
private void closeLaunchedBrowser() {
final TestApplet thisObject = this;
Runnable r = new Runnable() {
public void run() {
try {
JSObject win = (JSObject)JSObject.getWindow(thisObject);
if (win != null && win.toString() != null) {
//win.eval("top.opener=self;self.close();");
//win.call("close", null);
win.eval("self.close();");
} catch (Exception e) {
Thread t = new Thread(r);
t.start();
}If any one know solution regarding how to aviod this crash of browser please let me know. I will be very thankful to you.
Thanks.

Right, I sort of tracked down some code that uses getMethods to allow me to invoke a Javascript command. It is not pretty and took a little bit of editing to get to work but it does the job without putting JS stuff into my HTML.
However it is causing some problems. If I open one of my other applets it will only let me close that window and the previous applets ceases to respond at all. I think this may be because the invoke gets the JSObject which is the window and somehow having more than one applet open in different windows is causing it to get confused and is locking the first window and only responding to the second.
I have seen a much simpler method that uses:
import netscape.javascript.*;
and JSObject to get the window but my compiler complains about the import. Any further suggestions or an example would be welcome as my current solution is a bit limited as you can effectively only have one window open at a time which doesn't suit my needs.
Many thanks.
Mark.

How to open a new browser from applet

I have a Applet that run in a browser. How I can open the second broswer from the Applet. Make sure the first browser for Applet is still existing. Thanks anybody help!!

I think you might do something like this:
try {
getAppletContext().showDocument(new URL("http://web.com", "_blank");
} catch (MalformedURLException me) {
System.out.println(me.getMessage());
Hope this work out for you...
/Tomas

Close browser from applet?

How can I close the browser where my applet is from my applet??

import netscape.javascript.*; // netscape yes, but it works on IE as well
callJavaScript("window.clse()");
   public Object callJavaScript(String strJSCode)
      JSObject window;
      Object objRet;
      try
         window = JSObject.getWindow(this); // this=applet
         objRet = window.eval(strJSCode);
      catch (Exception ex)
         objRet = null;
      return objRet;
   }remember to add MAYSCRIPT to the applet tag.

Creating a popup browser window from an applet

Hi, in a java applet that I am developing i use AppletContext.showDocument to load a web-page. The thing is i want this window to be a popup, devoid of toolbar and statusbar, etc. do you have any idea on how i could accomplish this?
I tried to do it with javascript, but i could only create new pop-up child windows of the html file that contained the method for opening pop-ups, i could not change the parent window itself to become a popup.
If you have any idea on how to either create a pop-up type window from an applet, or make the current window into a popup i would be grateful to hear it.

The only way I can think of is to use JSObject to call JavaScript on the current page & have JavaScript do a window.open
http://forum.java.sun.com/thread.jsp?forum=31&thread=295808

Opening a frame from an applet

Hi,
I want to open a frame in my applet. If I'm using swing, JApplet opening a JFrame, is it possible to keep the frame open if the user browses away from the page that holds the applet?
Are there any tricks? I've tried opening it in a new Thread, but it still goes away when the the browser's page changes.
Could I call getParent() from the applet until I get an instance of Frame (which would be the browser) and set my JFrames' parent? Or does that only work with the old Netscape and old AWT Frames?
I basically want to know if I can keep my JFrame open until the browser is closed. Any ideas or suggestions would be greatly appreciated.
thank you very much

Do you want to open a jsp application in a frame when you click on the applet?If so, there is a programme in http://www.globalleafs.com -Java-Java Applets 's download section. Check it out.

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.

'Browse' from an applet

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