import io.undertow.servlet.ServletExtension; //导入依赖的package包/类
/**
 * Add the default WildFly Swarm {@code favicon.ico} handler.
 *
 * @return This archive.
 */
@SuppressWarnings("unchecked")
default T addFaviconExceptionHandler() throws IOException {
    // Add FaviconServletExtension
    String path = "WEB-INF/classes/" + FaviconServletExtension.EXTENSION_NAME.replace('.', '/') + ".class";
    byte[] generatedExtension;
    generatedExtension = FaviconFactory.createFaviconServletExtension(FaviconServletExtension.EXTENSION_NAME);
    add(new ByteArrayAsset(generatedExtension), path);

    // Add FaviconErrorHandler
    path = "WEB-INF/classes/" + FaviconServletExtension.HANDLER_NAME.replace('.', '/') + ".class";
    byte[] generatedHandler;
    generatedHandler = FaviconFactory.createFaviconErrorHandler(FaviconServletExtension.HANDLER_NAME);
    add(new ByteArrayAsset(generatedHandler), path);

    // Add services entry for FaviconServletExtension
    this.addAsServiceProvider(ServletExtension.class.getName(), FaviconServletExtension.EXTENSION_NAME);

    return (T) this;
}
 

import io.undertow.servlet.ServletExtension; //导入依赖的package包/类
public List<ServletExtension> getServletExtensions() {
    return servletExtensions;
}
 

import io.undertow.servlet.ServletExtension; //导入依赖的package包/类
/**
 * Adds an additional servlet extension to the deployment. Servlet extensions are generally discovered
 * using META-INF/services entries, however this may not be practical in all environments.
 * @param servletExtension The servlet extension
 * @return this
 */
public DeploymentInfo addServletExtension(final ServletExtension servletExtension) {
    this.servletExtensions.add(servletExtension);
    return this;
}