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Accessing properties file through jar [message #660359]

Fri, 18 March 2011 05:45

Swap

Messages: 30
Registered: March 2011

Member

There are jar plugins in my project. One jar needs access of PROPERTIES file from other jar. Then how to access that PROPERTIES file in jar?

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Re: Accessing properties file through jar [message #662323 is a reply to message #660359]

Wed, 30 March 2011 09:07

Aleksandar Pavlov

Messages: 79
Registered: July 2009

Member

Hi Swan,
I am glad I can help you and other newsgroup users:

String pluginLocation = getPluginLocation(PLUGIN_ID);

if (pluginLocation.endsWith(".jar!/")) { //compressed content
URL url = new URL("jar:" + pluginLocation);

JarURLConnection jarConnection = (JarURLConnection) url.openConnection();

JarFile jarFile = jarConnection.getJarFile();

ZipEntry fileEntry = jarFile.getEntry("META-INF/MANIFEST.MF");
}

and the main trick is in the method:

public static String getPluginLocation(String pluginId) {
URL result = Platform.getBundle( pluginId ).getEntry("/");
try {
result = FileLocator.resolve(result);
}
catch (IOException ioe){}

String filePath = result.getFile();

if ( filePath.startsWith("file:")) {
return filePath;
}
else
if ( System.getProperty("os.name").toLowerCase().contains("windows ") ) {

return filePath.substring(1); // fix "\c:[...]"
}
else {
return filePath;
}
}

Sorry for the bad formatting and I hope that helps,
Aleks

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Re: Accessing properties file through jar [message #662394 is a reply to message #662323]

Wed, 30 March 2011 14:10

Cole Markham

Messages: 150
Registered: July 2009
Location: College Station, TX

Senior Member

It's actually much easier than that:

import org.osgi.framework.Bundle;
import org.eclipse.core.runtime.Platform;

...

Bundle bundle = Platform.getBundle("com.example.otherbundle.pluginid");
URL entry = bundle.getEntry("/path/to/properties"); // path is relative to the bundle (project) root, e.g. "/META-INF/app.properties"

From there you should be able to do what you need with the file. Be sure you check the build.properties of your project to be sure the file you need is included in the binary build or you will be surprised when you go to deploy, speaking from experience. If you need further help, the Equinox or OSGi newsgroups should be more helpful.

Cole

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