How to load a resource bundle from a file resource in Java?

I have a file called mybundle.txt in c:/temp -

c:/temp/mybundle.txt

How do I load this file into a java.util.ResourceBundle? The file is a valid resource bundle.

This does not seem to work:

java.net.URL resourceURL = null;

String path = "c:/temp/mybundle.txt";
java.io.File fl = new java.io.File(path);

try {
   resourceURL = fl.toURI().toURL();
} catch (MalformedURLException e) {             
}           

URLClassLoader urlLoader = new URLClassLoader(new java.net.URL[]{resourceURL});
java.util.ResourceBundle bundle = java.util.ResourceBundle.getBundle( path , 
                java.util.Locale.getDefault(), urlLoader );

As long as you name your resource bundle files correctly (with a .properties extension), then this works:

File file = new File("C:\\temp");
URL[] urls = {file.toURI().toURL()};
ClassLoader loader = new URLClassLoader(urls);
ResourceBundle rb = ResourceBundle.getBundle("myResource", Locale.getDefault(), loader);

where "c:\temp" is the external folder (NOT on the classpath) holding the property files, and "myResource" relates to myResource.properties, myResource_fr_FR.properties, etc.

Credit to http://www.coderanch.com/t/432762/java/java/absolute-path-bundle-file

When you say it's "a valid resource bundle" - is it a property resource bundle? If so, the simplest way of loading it probably:

try (FileInputStream fis = new FileInputStream("c:/temp/mybundle.txt")) {
  return new PropertyResourceBundle(fis);
}

1) Change the extension to properties (ex. mybundle.properties.)
2) Put your file into a jar and add it to your classpath.
3) Access the properties using this code:

ResourceBundle rb = ResourceBundle.getBundle("mybundle");
String propertyValue = rb.getString("key");

From the JavaDocs for ResourceBundle.getBundle(String baseName):

baseName - the base name of the resource bundle, a fully qualified class name

What this means in plain English is that the resource bundle must be on the classpath and that baseName should be the package containing the bundle plus the bundle name, mybundle in your case.

Leave off the extension and any locale that forms part of the bundle name, the JVM will sort that for you according to default locale - see the docs on java.util.ResourceBundle for more info.

How to load a resource bundle from a file resource in Java?

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