datasourcelistener.java

稿件名称：基于JAVA的JNDI技术和反射机制 稿件作者：段谟意 源代码名称：WEB-INF 调试环境：Win XP；Tomcat, JVM:JDK 1.5.2

package ddd.com.listener;
import javax.servlet.*;
import javax.naming.*;
import javax.sql.DataSource;
import ddd.com.parse.*;
import ddd.com.ConfigConstants;
public class DataSourceListener implements ServletContextListener
{
	public static String JNDI_NAME;
	public void contextDestroyed(ServletContextEvent e)
	{
	}
	public void contextInitialized(ServletContextEvent e)
	{
		ServletContext sct=e.getServletContext();
		JNDI_NAME=sct.getInitParameter(ConfigConstants.DATASOURCEXML);
		String classname=JNDI_NAME;
		try
		{
			DataSourceParser dataSource=(DataSourceParser)Class.forName(classname).newInstance();
			dataSource.init(sct,ConfigConstants.XMLSOURCE);
			DataSource ds=dataSource.getDataSource();
			Context ctx=new InitialContext();
			ctx.bind(JNDI_NAME,ds);
		}
		catch(Exception exception)
		{
			sct.log("contextInitialized:",exception);
		}
	}
}