java applet will only save file locally and not on server?

Question

I have a java applet that runs fine locally on my desktop computer. but when I put it on my linux web server its works but the save file feature is save the file to the web browser temp folder and not to the web server.

<applet name="rapplet" type="applet" archive="applets.jar" 
     code="acap.class" codebase="." height="96" width="150"> 
<param name="msg" value="test.snd" />

Answer 1

A Java applet runs in the client browser and not on the server which explains why you cannot save files to the server.

Answer 2

If an applet at your site could save bytes directly to the server, then a trusted applet on other people's sites (or many other types of apps.) could also do that.

If someone were being malicious they might dump a couple of gigabytes to your server, leading to all sorts of problems.

For that reason, the server needs to protect itself from such denial of service attacks, and all uploads need to be done through an interface that your server specifically provides. This interface might, for example, check the size of the upload and that it contains no viruses or trojans.

Answer 3

You need:

• server-side code to handle file-upload. Look at java servlets and commons-fileupload
• the applet must send the files over HTTP. You can do this with Apache HttpClient

Update: you seem to have missed the point of Java applets - they run on the client. In the browser, that is. They have absolutely nothing to do with servers. If you want to have any communication with a server, you need some protocol - it could be HTTP (as I suggested), it could be plain sockets, or any other protocol that suits you.