using an executable jar file in a new java program

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jsaucedo@gmail.com - 28 Jul 2006 02:54 GMT

so i can run this parser i downloaded at
http://htmlparser.sourceforge.net/
using the following

C:\ics\111\htmlParse>java -jar bin/htmlparser.jar "http://www.bbc.com"

however, what i want to do is expand the functionality in my java
program by calling the parser class in the jar executable.

i'm not sure what i should do to have my program below compile with
giving me an error about not being able to find the package.

where i'm confused about
-import statement?
-classpath needed for jar file when I compile?
-do i need to unjar the file? thanks.

public final class Craig{
public static void main( String[] _args ){
Control _c = new Control( );
_c.start( _args );
}
}

final class Control{
Control(){
}
void start( String[] _args ){
System.out.println("test2");
Parser p =new Parser("http://www.NYT.com");
}
}

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Andrew Thompson - 28 Jul 2006 08:15 GMT

(Possible repost on my part, my apologies if this appears
twice.)

> so i can run this parser i downloaded at
> http://htmlparser.sourceforge.net/
[quoted text clipped - 10 lines]
> where i'm confused about
> -import statement?

Yes, it is required. (pauses) Was you question different to that?
Maybe you should be more specific, rather than expect your
reader to guess your meaning.

> -classpath needed for jar file when I compile?

Again yes.

[ but taking a wild stab at the wider question - 'How?' ]

You can add other archives on the classpath at time of
compilation or execution. The secret is to specify it
in the '-classpath' argument when compiling/running.

The 'classpath' option can be abbreviated to 'cp' on more
modern VM's. Here is how it might look.

CLI>javac -cp .;bin/htmlparser.jar CallsClassInMainArchive.java

The "-cp.;bin/htmlparser.jar" is the part of interest.

-cp
- the classpath - add these places to this invocation

.
- the current directory (assuming your in the same
directory as the Java code you are writing, or at the
'root' package of your code - this will add your code
into this new classpath)

;
- separator for multiple class path entries

bin/htmlparser.jar
- the location of your external archive of interest.

> -do i need to unjar the file? thanks.

No. Java tools as well as the classes are well set-up
for getting resources (classes, images, help files..)
directly out of Zip files (a Jar is just a specialised
form of Zip file).

BTW - Please use Upper Case letters at the start of
sentences. It helps the reader to spot where breaks are,
and therefore makes messages easier to understand.

Andrew T.

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using an executable jar file in a new java program

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