采用commons-configuration包实现属性文件读取的工具类

import org.apache.commons.configuration.CompositeConfiguration;    import org.apache.commons.configuration.ConfigurationException;    import org.apache.commons.configuration.PropertiesConfiguration;        public class PropManager {            /**        * @param args        */        public static void main(String[] args) {                String jdbcUrl = PropManager.getInstance().getProperty("jdbc.cms.url");            String jdbcUsername = PropManager.getInstance().getProperty("jdbc.cms.username");            String jdbcPassword = PropManager.getInstance().getProperty("jdbc.cms.password");                        System.out.println("jdbcUrl:"+jdbcUrl);            System.out.println("jdbcUsername:"+jdbcUsername);            System.out.println("jdbcPassword:"+jdbcPassword);                        System.out.println(PropManager.getInstance());            System.out.println(PropManager.getInstance());                    }        private PropManager() {        }                private static PropManager propManager;        public synchronized static PropManager getInstance() {            if (propManager == null) {                propManager = new PropManager();            }            return propManager;        }                public static CompositeConfiguration config = new CompositeConfiguration();        static {            try {                config.addConfiguration(new PropertiesConfiguration("jdbc.properties"));            } catch (ConfigurationException e) {                e.printStackTrace();            }        }                public String  getProperty(String key)        {            return config.getString(key);        }                        }  

使用的包:  commons-configuration-1.6.jar

几点说明:

 1. 采用了单态设计模式,

2.属性文件在classpath目录下.

3. 采用commons-configuration-1.6.jar来读取属性文件