一个关于数据库实现类初使化的解决办法

前几天写了个数据库链接池类，但有个问题使终解决得不太满意，所以贴出来让大家帮我想想办法啦.....
首先写了个ConnectionFactory接口类，代码如下：

package com.luoyu.persistence;public interface ConnectionFactory {public static final String CONNECTION_USERNAME = "connection.username";public static final String CONNECTION_PASSWORD = "connection.password";public static final String CONNECTION_URL = "connection.url";public static final String DRIVER_CLASS = "driver.class";}

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然后是DataSourceConnectionFactory实现类：

package com.luoyu.persistence;import java.io.IOException;import java.sql.Connection;import java.sql.SQLException;import java.util.Properties;import oracle.jdbc.pool.OracleDataSource;public class DataSourceConnectionFactory implements ConnectionFactory {private static DataSourceConnectionFactory instance;private static Properties config;@SuppressWarnings( { "unchecked", "unused" })private static Class driver;private static OracleServerDataSource Orads;private static ThreadLocal<Connection> threadLocal = new ThreadLocal<Connection>();static{init();}public static void init(){try {config = new Properties();config.load(ConnectionFactory.class.getResourceAsStream("/config.properties"));Orads= new OracleDataSource();driver = Class.forName(config.getProperty(DRIVER_CLASS));Orads.setUser(config.getProperty(CONNECTION_USERNAME));SQLds.setPassword(config.getProperty(CONNECTION_PASSWORD));Orads.setURL(config.getProperty(CONNECTION_URL));} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}}private static DataSourceConnectionFactory getInstance() {if (instance == null) {instance = new DataSourceConnectionFactory();}return instance;}public static void closeConnect() throws SQLException {if (!threadLocal.get().isClosed() && threadLocal.get() != null) {threadLocal.get().close();}threadLocal.set(null);}public static void destory() {instance = null;config = null;driver = null;Orads= null;}private Connection getConnect() throws SQLException {if (threadLocal.get() == null || threadLocal.get().isClosed()) {threadLocal.set(Orads.getConnection());}return threadLocal.get();}public static Connection getConnection()throws SQLException{Connection connection = getInstance().getConnect();return connection;}}

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config.properties配置文件：

connection.username=systemconnection.password=adminconnectino.url=jdbc:oracle:thin://localhost:1521:orcldriver.class=oracle.jdbc.driver.OracleDriver

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好了，问题来了，在实现类里，那个静态块显得有点多余，但我去掉后，老是报threadLocal.set(Orads.getConnection());的空指针异常，很显然数据源Orads没有初使化成功，如果把public static void init()方法改为静态块就行，但这样我在前台没法写监听器了，因为没有init()方法给我调用。。。整个采用单例设计模式，对外隐藏了getInstance()方法，只提供destory(),init().和getConnection(),所以这个问题我没法解决了....

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