330 Java Tips.pdf - FTP Server

File Systems II
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File Systems II
Q: How do I delete a file in Java? I have programmed a Java application that
needs to delete a file, but I couldn't find anything on the topic.
Answer: in java.io.File there is delete
public boolean delete()
Deletes the file or directory denoted by this abstract pathname. If this pathname
denotes a directory, then the directory must be empty in order to be deleted. Create
a new File object representing the file, and then use the delete () method. If you use
the Microsoft JVM, make sure the file is not shared before you delete it, otherwise
that will not work (the delete () method returns "false").
Q: I need to read C:\test.doc for example and store it somewhere for my future
use. I don't know anything about security. Part 1
Answer: If you want to read a file on the local file system in an applet, you are going
to digitally sign the applet, and the user of the applet is going to indicate trust in the
signature. How you go about this depends on a number of questions, like:
In which browser(s) will the users be running the applet?
Will a Java plug-in be installed in the browser?
Can the user install a plug-in?
Here are a few tips on some of the sticky points of signing applets...
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If you are using the jar signing tools that come with the JDK, you'll find that they will
only work with the Java plug-in. Netscape and Microsoft IE don't salute the Sun way
of signing applets.
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