ServletRequestListener

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@WebListener
public class ServletRequestListenerDemo implements ServletRequestListener {

    @Override
    public void requestDestroyed(ServletRequestEvent servletRequestEvent) {

    }

    @Override
    public void requestInitialized(ServletRequestEvent servletRequestEvent) {

    }
}

ServletRequestAttributeListener

@WebListener
public class ServletRequestAttributeListenerDemo implements ServletRequestAttributeListener {
    @Override
    public void attributeAdded(ServletRequestAttributeEvent servletRequestAttributeEvent) {

    }

    @Override
    public void attributeRemoved(ServletRequestAttributeEvent servletRequestAttributeEvent) {

    }

    @Override
    public void attributeReplaced(ServletRequestAttributeEvent servletRequestAttributeEvent) {

    }
}

AsyncListener

@WebListener
public class AsyncListenerDemo implements AsyncListener {
    @Override
    public void onComplete(AsyncEvent asyncEvent) throws IOException {

    }

    @Override
    public void onTimeout(AsyncEvent asyncEvent) throws IOException {

    }

    @Override
    public void onError(AsyncEvent asyncEvent) throws IOException {

    }

    @Override
    public void onStartAsync(AsyncEvent asyncEvent) throws IOException {

    }
}

网页题目：ServletRequestlistener
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