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

Question

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

c:/temp/mybundle.txt

How do I load this file into a java.util.Res

Answer 1

I think that you want the file's parent to be on the classpath, not the actual file itself.

Try this (may need some tweaking):

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

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

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

Answer 2

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);
}

Answer 3

public class One {

    private static One one = null;

    Map<String, String> configParameter = Collections.synchronizedMap(new HashMap<String, String>());

    private One() {
        ResourceBundle rb = ResourceBundle.getBundle("System", Locale.getDefault());

        Enumeration en = rb.getKeys();
        while (en.hasMoreElements()) {
            String key = (String) en.nextElement();
            String value = rb.getString(key);
            configParameter.put(key, value);

        }
    }

    public static One getInstance() {
        if (one == null) {
            one= new One();
        }

        return one;

    }

    public Map<String, String> getParameter() {

        return configParameter;
    }



    public static void main(String[] args) {
        String string = One.getInstance().getParameter().get("subin");
        System.out.println(string);

    }
}

Answer 4

ResourceBundle rb = ResourceBundle.getBundle("service"); //service.properties
System.out.println(rb.getString("server.dns")); //server.dns=http://....

Answer 5

This worked for me very well. And it doesn't reload the bundle everytime. I tried to take some stats to load and reload the bundle from external file location.

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.

Note: If you have the same bundle name on your classpath then it will be picked up by default using this constructor of URLClassLoader.

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

Find some of the stats below, all time in ms. I am not worried about the initial load time as that could be something with my workspace or code that I am trying to figure out but what I am trying to show is the reload took way lesser telling me its coming from memory.

Here some of the stats:

• Initial Locale_1 load took 3486
• Reload Locale_1 took 24
• Reload Locale_1 took 23
• Reload Locale_1 took 22
• Reload Locale_1 took 15
• Initial Locale_2 load took 870
• Reload Locale_2 took 22
• Reload Locale_2 took 18
• Initial Locale_3 load took 2298
• Reload Locale_3 took 8
• Reload Locale_3 took 4

Answer 6

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");