systemstart.java

JAVA的MVC三层开发的图书馆管理系统。

package mypackage;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContext;
import javax.sql.*;
import javax.naming.*;

public class SystemStart implements ServletContextListener 
{
  private ServletContext context = null;
  private InitialContext ctx = null; 
  private DataSource ds = null;
  
  public void contextInitialized(ServletContextEvent event)
  {
    try{
      context = event.getServletContext();
      ctx = new InitialContext();
      ds = (DataSource)ctx.lookup("jdbc/databaseDS");
      context.setAttribute("DataSrc",ds);
    }
    catch(NamingException e){
      System.out.println(e.getMessage());
    }
  }

  public void contextDestroyed(ServletContextEvent event)
  {
    context = event.getServletContext();
  }
}