问题
My installation widget.zip zipfile contains the following:
- 32bitJava
- install.jar
- widgetinstaller.exe
- widgetinstaller.ini
- widgetinstaller.ico
To summarize:
- 32bitJava is a 32bit JRE downloaded from Oracle
- install.jar is the installer created by Izpack
- widgetinstaller.* are created by winrun4j providing an exe wrapper for the installer.
So with this setup I can install my application without user having to have a java runtime already installed.
However once installed the actual application also needs a java runtime to actually run. So at the moment a copy of 32bitJava is included as part of the izpack install, i.e it exists in install.jar and is installed at installation time.
But this means I have two copies of the JVM, and because the 32bitJava is larger than my actual application makes my download much too large.
So how can I copy the 32bitJava folder into the installation during/after installation instead of having to include it in install.jar ?
回答1:
You want to do a "loose" pack for the JVM. A loose pack doesn't need to contain the files it installs, so it could copy the file from the zip into place, instead of using one embedded in the jar.
<pack id="java" name="java" required="yes" preselected="yes" loose="true">
...
<executable ...>
<!-- something appropriate to install java -->
</executable>
</pack>
回答2:
Pack the files into a self-extracting archive/zip, and as part of the unzip process, have the files extracted to the location you need them to be.
There is more information about self-extracting archives at Wikipedia: http://en.wikipedia.org/wiki/Self-extracting_archive
回答3:
Instead of being forced to include the java installation in the install.jar, why don't you just have the install.jar install your program and include a link here: http://www.java.com/inc/BrowserRedirect1.jsp?locale=en ? That is the link to download the current version of java.
To create such a link, right click > new > shortcut, paste in the link into the first dialogue box, click next, then name it "Java Installation". This would add 4 kb at most to your package, and still allow you to install java (however, the user will have to click this manually)
I am using the browser redirect URL because it identifies what java people need based on thier computer (OS and processor bit)
回答4:
How about creating a small, post-installation utility to copy the executable to the location? You could create it in a small shell script (or batch file on Windows) or even a little C++ utility that simply copies the JVM to the location you need. This way, after you install the utility, you then trigger the post-installation code, and copy the JVM over to the desired location.
来源：https://stackoverflow.com/questions/12516240/can-i-install-a-file-using-izpack-5-without-it-being-part-of-the-install-jar-bui