signed applet, downloading file from server and place it in the file system

Question

I have signed applet, I want to download any kind of file from the server and place it in the file system using the applet.

Please give some pointer.

Thanks in advance.

score 0 · Answer 1 · answered Oct 10 '11 at 02:24

0

You'll have to write servlet for this. Because servlets can access to server local file system and get files you want for your applet :) Make bound like a

applet <-servlet<-server

Good luck

answered Oct 10 '11 at 02:24

user592704

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What does 'make bound like' mean? – user207421 Oct 10 '11 at 04:20
in this case bound means that servlet should send output stream to your applet :) – user592704 Oct 10 '11 at 16:19
;-) is fine but could we stick to the standard terminology please? – user207421 Oct 10 '11 at 20:55
It is not a standard technology (not a framework or something). You'll have to write two programms as servlet (as a back-end) and applet (as its front-end app). Next you'll have to combine applet+servlet with IO interaction. In your case you want to make a download applet so you need your servlet to provide output stream right to your applet using http :) It is a commonly used thing especially in applets which should work with db source because they all use servlet for this... – user592704 Oct 12 '11 at 03:09
So search in these directions as "applet" then "servlet" and then "applet and database". So basically you need to know how to write applets and how to write servlets; rest thing it is just applet and setvlet interaction with http and nothing more :) – user592704 Oct 12 '11 at 03:12
Reading a TCP connection is standard technology. It is not necessary to invent terminology like 'make bounded' to describe it. 'Connect' covers it adequately. – user207421 Oct 12 '11 at 23:44

score 0 · Answer 2 · answered Oct 17 '11 at 06:52

The applet need to be signed to access the file system.

 public String downloadFile(final String filename) {
    return (String)AccessController.doPrivileged(new PrivilegedAction(){
        public Object run() {       
          try {
                // downloadURL is the server URL say http://localhost/downloads
                // filename is a file want to download from the server 
                // localpath is the path you want to download in the file system
                URL finalURL = new URL(downloadURL + filename);
                ReadableByteChannel rbc = Channels.newChannel(finalURL.openStream());
                FileOutputStream fos = new FileOutputStream("/"+localpath.replace("\\","/") +  filename);
                fos.getChannel().transferFrom(rbc, 0, 1 << 24);
                fos.close();
            return "true";
          }catch (ConnectException ce) {
              e.printStackTrace();
              return "false";
          } 
          catch (Exception e) {
            e.printStackTrace();
            return "false";
          }
        }
      });
}

signed applet, downloading file from server and place it in the file system

2 Answers2