PropertiesConfiguration是一個配置檔案的載入工具類，封裝了從配置檔案裡獲取值並轉化為基本資料型別的方法。

它來自commons-configuration-1.6.jar。

直接上程式碼：

public class Config {
	private static PropertiesConfiguration config = null;
	
	static {
		try {
			config = new PropertiesConfiguration(
					"config.properties");
		} catch (ConfigurationException e) {
			e.printStackTrace();
		}
	}
	
	public static String getString(String key) {
        return config.getString(key);
    }

    public static String getString(String key, String def) {
        return config.getString(key, def);
    }

    public static int getInt(String key) {
        return config.getInt(key);
    }

    public static int getInt(String key, int def) {
        return config.getInt(key, def);
    }

    public static long getLong(String key) {
        return config.getLong(key);
    }

    public static long getLong(String key, long def) {
        return config.getLong(key, def);
    }

    public static float getFloat(String key) {
        return config.getFloat(key);
    }

    public static float getFloat(String key, float def) {
        return config.getFloat(key, def);
    }

    public static double getDouble(String key) {
        return config.getDouble(key);
    }

    public static double getDouble(String key, double def) {
        return config.getDouble(key, def);
    }

    public static boolean getBoolean(String key) {
        return config.getBoolean(key);
    }

    public static boolean getBoolean(String key, boolean def) {
        return config.getBoolean(key, def);
    }

    public static String[] getStringArray(String key) {
        return config.getStringArray(key);
    }

    @SuppressWarnings("unchecked")
    public static List getList(String key) {
        return config.getList(key);
    }

    @SuppressWarnings("unchecked")
    public static List getList(String key, List def) {
        return config.getList(key, def);
    }

    public static void setProperty(String key, Object value) {
        config.setProperty(key, value);
    }

}