Java Properties如何用啊?有没有更好的案例实际点用

/*TestProperties*/import java.util.Properties;import java.util.Enumeration;public class TestProperties{    public static void main(String[]args)    {        Properties props=System.getProperties();        Enumeration prop_names=props.propertyNames();                while(prop_names.hasMoreElements())        {                String prop_name=(String)prop_names.nextElement();                String property=props.getProperty(prop_name);                System.out.println("属性:"+prop_name+"'是"+property+"'");        }    }}

    private ConnectionFactory()    {        Properties prop = null;        try        {            InputStream in = this.getClass().getClassLoader()                    .getResourceAsStream("properties/dbconfig.properties");            prop = new Properties();            prop.load(in);            driver = prop.getProperty("driver");            dbURL = prop.getProperty("url");            user = prop.getProperty("user");            password = prop.getProperty("password");            in.close();        } catch (Exception e)        {            System.out.println("No dbconfig.properties defined error");            System.exit(-1);        }    }