Property Loader : Properties « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Properties

import java.io.InputStream;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Properties;
import java.util.ResourceBundle;

public class PropertyLoader {

  public static Properties loadProperties(String name, ClassLoader loader) throws Exception {
    if (name.startsWith("/"))
      name = name.substring(1);
    if (name.endsWith(SUFFIX))
      name = name.substring(0, name.length() - SUFFIX.length());
    Properties result = new Properties();
    InputStream in = null;
    if (loader == null)
      loader = ClassLoader.getSystemClassLoader();
    if (LOAD_AS_RESOURCE_BUNDLE) {
      name = name.replace('/', '.');
      ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault(), loader);
      for (Enumeration keys = rb.getKeys(); keys.hasMoreElements();) {
        result.put((String) keys.nextElement(), rb.getString((String) keys.nextElement()));
      }
    } else {
      name = name.replace('.', '/');
      if (!name.endsWith(SUFFIX))
        name = name.concat(SUFFIX);
      in = loader.getResourceAsStream(name);
      if (in != null) {
        result = new Properties();
        result.load(in); // can throw IOException
      }
    }
    in.close();
    return result;
  }

  public static Properties loadProperties(final String name) throws Exception {
    return loadProperties(name, Thread.currentThread().getContextClassLoader());
  }

  private static final boolean LOAD_AS_RESOURCE_BUNDLE = false;

  private static final String SUFFIX = ".properties";

}