利用jConfig獲取xml文件中的配置信息
第一步：下載jConfig 在http://sourceforge.net/里下載最新的jConfig項目包http://sourceforge.net/PRoject/showfiles.php?group_id=38356&package_id=30463&release_id=272653,下載最新bin包(我用的是jconfig-bin-v2.8.5.zip)
第二步：所需包 解開下載的zip文件，在dist目錄下有jconfig.jar(這是項目包)；在lib目錄下有crimson.jar,jaXP.jar,jmxri.jar(這是解析xml文件所需的三個包) 把這四個jar打到你的classpath中去
第三步：書寫xml配置文件config.xml
<?xml version="1.0" encoding="iso-8859-1" ?>
 <properties>
   <category name="general">
     <property name="QueueConnectionFactory" value="java:/ConnectionFactory"/>
   </category>
   <category name="database">
     <property name="DataSource" value="java:DB2DS"/>
   </category>
 </properties>
第四步：書寫java文件
public class GetConfig {

    public static Configuration configuration;

    static {
        configuration = ConfigurationManager.getConfiguration();
    }

    public static String queueConnectionFactory = getProperties(
            "QueueConnectionFactory", "java:/ConnectionFactory");

    public static String datasource = getProperties("DataSource", "java:DB2DS",
            "database");
 
    public static String getProperties(String key, String defaultValue) {
        return configuration.getProperty(key, defaultValue);
    }

    public static String getProperties(String key, String defaultValue,
                                       String category) {
        return configuration.getProperty(key, defaultValue, category);
    }

    public static void main(String[] args) {
        System.out.println(GetConfig.driverClassName + "-" + GetConfig.url +