3.JDBC XmlConfigReader类,读取连接数据库配置数据,把读取的数据封装在类JdbcConfig中

package com.bjpowernode.drp.util;import java.io.InputStream;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;/** * 采用单例模式解析sys-config.xml文件  * @author Administrator * */public class XmlConfigReader {////饿汉式(预先加载)//private static XmlConfigReader instance = new XmlConfigReader();////private XmlConfigReader() {////}////public static XmlConfigReader getInstance() {//return instance;//}//懒汉式（延迟加载lazy）private static XmlConfigReader instance = null;////保存dao工厂的名称////key=名称，value=具体类完整路径//private Map<String, String> daoFactoryMap = new HashMap<String, String>();//保存jdbc相关配置信息private JdbcConfig jdbcConfig = new JdbcConfig();private XmlConfigReader() {SAXReader reader = new SAXReader();InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream("sys-config.xml");try {Document doc = reader.read(in);//取得jdbc相关配置信息Element driverNameElt = (Element)doc.selectObject("/config/db-info/driver-name");Element urlElt = (Element)doc.selectObject("/config/db-info/url");Element userNameElt = (Element)doc.selectObject("/config/db-info/user-name");Element passwordElt = (Element)doc.selectObject("/config/db-info/password");//设置jdbc相关的配置jdbcConfig.setDriverName(driverNameElt.getStringValue());jdbcConfig.setUrl(urlElt.getStringValue());jdbcConfig.setUserName(userNameElt.getStringValue());jdbcConfig.setPassword(passwordElt.getStringValue());System.out.println("读取jdbcConfig-->>" + jdbcConfig);////取得DaoFactory信息//List daoFactorylist = doc.selectNodes("/config/dao-factory/*");//for (int i=0; i<daoFactorylist.size(); i++) {//Element daoFactoryElt = (Element)daoFactorylist.get(i);//String tagName = daoFactoryElt.getName();//String tagText = daoFactoryElt.getText();//System.out.println("读取DaoFactory-->>" + tagText);//////放入到Map中//daoFactoryMap.put(tagName, tagText);//}} catch (DocumentException e) {e.printStackTrace();}}public static synchronized XmlConfigReader getInstance() {if (instance == null) {instance = new XmlConfigReader();}return instance;}/** * 返回jdbc相关配置 * @return */public JdbcConfig getJdbcConfig() {return jdbcConfig;}///**// * 根据标签名称取得DaoFactory的名字// * @param name// * @return daoFactory的完整类路径// *///public String getDaoFactory(String name) {//return daoFactoryMap.get(name);//}public static void main(String[] args) {//String itemDaoFactory = XmlConfigReader.getInstance().getDaoFactory("item-dao-facotry");//System.out.println("itemDaoFactory=" + itemDaoFactory);//JdbcConfig jdbcConfig = XmlConfigReader.getInstance().getJdbcConfig();//System.out.println(jdbcConfig.getDriverName());//System.out.println(jdbcConfig.getUrl());//System.out.println(jdbcConfig.getUserName());//System.out.println(jdbcConfig);}}