How do you deploy a JAR file to Tomcat? Typically you deploy WAR files, not JARs. But if you need to link to a JAR file from a Java web app on Apache Tomcat, here's how to do it.

Java's I/O streams provide standardized ways to read and write data. Any object representing a mutable data source in Java exposes methods for reading and writing its data as a stream.

I read that java applets aren't allowed to read or write to files fullstop but i can certainly read from a file so I thought my understanding of java applet security might need a little updating ...