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jar question

Hello,

I'm trying to write an applet that shows the exif information of a jpeg
image. For displaying this information I'm going to use the classes
found on this website http://www.drewnoakes.com/code/exif/.

But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?

Thanks,

Christof Laeremans

Jul 17 '05 #1
6 2533
On Mon, 01 Sep 2003 20:40:15 +0200, Christof Laeremans
<christof_nospam_laeremans@yahoo_againnospam_co.uk > two-finger typed:
Hello,

I'm trying to write an applet that shows the exif information of a jpeg
image. For displaying this information I'm going to use the classes
found on this website http://www.drewnoakes.com/code/exif/.

But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?
Although, officially you can add more than one JAR file into the ARCHIVE
tag of the APPLET tag (or the ARCHIVE parameter of the OBJECT tag), you
could also:
1) unJAR the classes and JAR your classes together with the Exim classes
for a single JAR file.
2) only reference the Exim JAR file with ARCHIVE, and put your own classes
unarchived into the site.

Thanks,

Christof Laeremans


Cheers.
Jul 17 '05 #2
Neomorph wrote:
On Mon, 01 Sep 2003 20:40:15 +0200, Christof Laeremans
<christof_nospam_laeremans@yahoo_againnospam_co.uk > two-finger typed:

Hello,

I'm trying to write an applet that shows the exif information of a jpeg
image. For displaying this information I'm going to use the classes
found on this website http://www.drewnoakes.com/code/exif/.

But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?

Although, officially you can add more than one JAR file into the ARCHIVE
tag of the APPLET tag (or the ARCHIVE parameter of the OBJECT tag), you
could also:
1) unJAR the classes and JAR your classes together with the Exim classes
for a single JAR file.
2) only reference the Exim JAR file with ARCHIVE, and put your own classes
unarchived into the site.

Thanks,

Christof Laeremans

Cheers.


Hello,

So, I've created my java applet and imported it in an HTML file with the
applet tag

<applet
archive = "photoexif/metadata-extractor-2.1.jar"
code = "photoexif/Exif.class"
name = "TestApplet"
width = "400"
height = "20"
hspace = "0"
vspace = "0"
align = "middle"

</applet>

But, the only thing I see is a gray bar with no text. When I start the
applet with JBuilder I can see the exif off the selected photo.

What is wrong ?

Regards,

Christof Laeremans
Jul 17 '05 #3
(See below)

On Wed, 03 Sep 2003 08:44:09 +0200, Christof Laeremans
<christoflaeremans_nospam_@yahoo_nospam.co.uk> two-finger typed:
Neomorph wrote:
On Mon, 01 Sep 2003 20:40:15 +0200, Christof Laeremans
<christof_nospam_laeremans@yahoo_againnospam_co.uk > two-finger typed:
But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?
Although, officially you can add more than one JAR file into the ARCHIVE
tag of the APPLET tag (or the ARCHIVE parameter of the OBJECT tag), you
could also:
1) unJAR the classes and JAR your classes together with the Exim classes
for a single JAR file.
2) only reference the Exim JAR file with ARCHIVE, and put your own classes
unarchived into the site.

So, I've created my java applet and imported it in an HTML file with the
applet tag

<applet
archive = "photoexif/metadata-extractor-2.1.jar"
code = "photoexif/Exif.class"


You can't add a path to the class in the CODE tag, you need to set the
codebase, instead:

codebase="photoexif"
archive = "metadata-extractor-2.1.jar" <!-- from codebsae -->
code = "Exif.class" <!-- from codebsae -->
name = "TestApplet"
width = "400"
height = "20"
hspace = "0"
vspace = "0"
align = "middle"

</applet>

But, the only thing I see is a gray bar with no text. When I start the
applet with JBuilder I can see the exif off the selected photo.


The tags cannot be used that easily, they have very specific functions of
their own.

I'm quite interested in Exif - isn't it an extension to JPG that adds
information about how the image was taken ?
Cheers.
Jul 17 '05 #4
Neomorph wrote:
(See below)

On Wed, 03 Sep 2003 08:44:09 +0200, Christof Laeremans
<christoflaeremans_nospam_@yahoo_nospam.co.uk> two-finger typed:
Neomorph wrote:
On Mon, 01 Sep 2003 20:40:15 +0200, Christof Laeremans
<christof_nospam_laeremans@yahoo_againnospam_co .uk> two-finger typed:

But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?

Although, officially you can add more than one JAR file into the ARCHIVE
tag of the APPLET tag (or the ARCHIVE parameter of the OBJECT tag), you
could also:
1) unJAR the classes and JAR your classes together with the Exim classes
for a single JAR file.
2) only reference the Exim JAR file with ARCHIVE, and put your own classes
unarchived into the site.


So, I've created my java applet and imported it in an HTML file with the
applet tag

<applet
archive = "photoexif/metadata-extractor-2.1.jar"
code = "photoexif/Exif.class"

You can't add a path to the class in the CODE tag, you need to set the
codebase, instead:

codebase="photoexif"
archive = "metadata-extractor-2.1.jar" <!-- from codebsae -->
code = "Exif.class" <!-- from codebsae -->
name = "TestApplet"
width = "400"
height = "20"
hspace = "0"
vspace = "0"
align = "middle"

</applet>

But, the only thing I see is a gray bar with no text. When I start the
applet with JBuilder I can see the exif off the selected photo.

The tags cannot be used that easily, they have very specific functions of
their own.

I'm quite interested in Exif - isn't it an extension to JPG that adds
information about how the image was taken ?
Cheers.


Hello,

I'm going to try that. The exif is indeed an extension for JPG. the
applet works great in my JBuilder IDE (and hopefully now in my bowser ;) )

Regards,

Christof Laeremans

Jul 17 '05 #5
seb
Christof Laeremans <christof_nospam_laeremans@yahoo_againnospam_co.uk > wrote in message news:<bj**********@reader08.wxs.nl>...
Hello,

I'm trying to write an applet that shows the exif information of a jpeg
image. For displaying this information I'm going to use the classes
found on this website http://www.drewnoakes.com/code/exif/.

But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?

Thanks,

Christof Laeremans

a jar is the same thing that a group of .class files. You can also
rename it with the zip extention an extract .class files.
Jul 17 '05 #6
seb wrote:
Christof Laeremans <christof_nospam_laeremans@yahoo_againnospam_co.uk > wrote in message news:<bj**********@reader08.wxs.nl>...
Hello,

I'm trying to write an applet that shows the exif information of a jpeg
image. For displaying this information I'm going to use the classes
found on this website http://www.drewnoakes.com/code/exif/.

But, they are in an jar file. Is there a way to import this jar file
into my applet so I can use the classes and methods for getting this
information?

Thanks,

Christof Laeremans


a jar is the same thing that a group of .class files. You can also
rename it with the zip extention an extract .class files.


A better way to do this is to include the jar in your classpath. Timply
type:

java -cp c:\path\to\my\jar\file\thejarfile.jar MyMainClass

and your application will include the files in the jarfile when it
executes. There is a similar syntax for javac, and you can include
second party jars this way for applets and web start applications too.

I would definately not recommend unzipping the jar and using the .class
files directly.

Lots more on jars, including use of the manifest file, can be found at
Sun's tutorial site:

http://java.sun.com/j2se/1.4.2/docs/guide/jar/
Mark McKay

Jul 17 '05 #7

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