在罐子外面找不到资源

Question

I am trying to read properties which is located external to the jar file of my code.using ResourceBundle but its unable to read the property file locations.properties . The property file is located under resource folder and both jar and resource folder are under same directory.

myDir

   --> myJar.jar
   --> resource
          -->locations.properties

I don't know whats wrong with my code below:

public static ResourceBundle getResourceBundle(String fileName) throws MalformedURLException{
    if (resourceBundle == null) {
        File file = new File("resource/"+fileName);
        URL[] urls = { file.toURI().toURL() };
        ClassLoader loader = new URLClassLoader(urls);
        resourceBundle = ResourceBundle.getBundle(fileName, Locale.getDefault(), loader);
    }
    return resourceBundle;
}

And this is how am invoking ResourceBundle object:

ResourceBundle locationBundle = null;
try {
    locationBundle = ReadPropertyUtil.getResourceBundle(propFileName);
} catch (MalformedURLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

Please guide whats wrong with this code and whats the correct way of reading an external properties file.

Answer 1

1. Get Jar file path.
2. Get Parent folder of that file.

3. Use that path in InputStreamPath with your properties file name.

    Properties prop = new Properties(); try { File jarPath=new File(YourClassNameInJar.class.getProtectionDomain().getCodeSource().getLocation().getPath()); String propertiesPath=jarPath.getParentFile().getAbsolutePath(); System.out.println(" propertiesPath-"+propertiesPath); prop.load(new FileInputStream(propertiesPath+"/resource/locations.properties")); } catch (IOException e1) { e1.printStackTrace(); } 

Answer 2

Well, I figured out the error myself. I was appending the fileName to the directory location File file = new File("resource/"+fileName); which was wrong.

All I had to do was to first get the present working directory name using

System.getProperties("user.dir")   //this gives me the path of my current directory

and passing only the directory name to file object.

File file = new File("resource/");

And then load the bundle using the specified file name.

resourceBundle = ResourceBundle.getBundle(fileName, Locale.getDefault(), loader);

ResourceBundle automatically looks into the directory and loads the file specified by the fileName