Configuration 如何在tomcat中启动时加载配置文件

我希望能够在tomcat（apache commons配置库）启动时加载我的webapp配置，这是一种可行的方式：

public class MyAppCfg implements javax.servlet.ServletContextListener {

private ServletContext context = null;

@Override
public void contextInitialized(ServletContextEvent event) {
    try{
        this.context = event.getServletContext();

        XMLConfiguration config = new XMLConfiguration("cfg.xml");
        config.setReloadingStrategy(new FileChangedReloadingStrategy());

        this.context.setAttribute("mycfg", config);
    }
    catch (Exception e) {
        e.printStackTrace();
    }
}

@Override
public void contextDestroyed(ServletContextEvent arg0) {
    this.context = null;
   }
}

web.xml

<listener>
    <listener-class>mypackage.MyAppCfg</listener-class>    
</listener>

---

不，您无法通过这种方式获得配置。您正在servlet上下文中设置它，但在请求上下文中检索它

您需要像这样在Servlet init中检索cfg

public void init(final ServletConfig config) {
        // log it to the ServletContext
        ServletContext context = config.getServletContext();
        this.cfg = (Configuration)context.getAttribute("mycfg");
}

public void init(final ServletConfig config) {
        // log it to the ServletContext
        ServletContext context = config.getServletContext();
        this.cfg = (Configuration)context.getAttribute("mycfg");
}