如何configuration蜻蜓服务静态内容（如图像）？

我有一个运行在Wildfly 8.0.0 Final上的JavaEE应用程序。

应用程序使用了大量的图像，我不想将它们存储在数据库中，因此它们被写入硬盘。

如何configurationWildfly / Undertow以在某个URL上提供这些文件（/ var / images），例如http://localhost:8080/myapplication/imagesFromDisk ？

Answer 1

将另一个文件处理程序和另一个位置添加到standalone.xml中的pipe道子系统：

 <server name="default-server"> <http-listener name="default" socket-binding="http"/> <host name="default-host" alias="localhost"> <location name="/" handler="welcome-content"/> <location name="/img" handler="images"/> </host> </server> <handlers> <file name="welcome-content" path="${jboss.home.dir}/welcome-content" directory-listing="true"/> <file name="images" path="/var/images" directory-listing="true"/> </handlers> 

Answer 2

如果你不想，或者不能，在standalone.xml configurationUndertow子系统 ，那么你需要在.war工作。 为此，您可以使用一个servlet来提供这些文件。 有很less的实现，最有名的（或最高的谷歌）是由BalusC 。 尽pipe如此，这是LGPL授权的。 所以我拿了DefaultServlet ， 使它更容易扩展 ，所以你可以给它正确的Undertow Resource ，例如从一个文件系统 。

从理论上讲，Undertow中的一些servlet也应该能够从文件系统提供服务，但是DefaultServlet代码似乎只能用于部署中的资源。

基类：

  /* * JBoss, Home of Professional Open Source. * Copyright 2014 Red Hat, Inc., and individual contributors * as indicated by the @author tags. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package io.undertow.servlet.handlers; import io.undertow.io.IoCallback; import io.undertow.io.Sender; import io.undertow.server.HttpServerExchange; import io.undertow.server.handlers.resource.DirectoryUtils; import io.undertow.server.handlers.resource.RangeAwareResource; import io.undertow.server.handlers.resource.Resource; import io.undertow.server.handlers.resource.ResourceManager; import io.undertow.servlet.api.DefaultServletConfig; import io.undertow.servlet.api.Deployment; import io.undertow.servlet.spec.ServletContextImpl; import io.undertow.util.ByteRange; import io.undertow.util.CanonicalPathUtils; import io.undertow.util.DateUtils; import io.undertow.util.ETag; import io.undertow.util.ETagUtils; import io.undertow.util.Headers; import io.undertow.util.Methods; import io.undertow.util.StatusCodes; import javax.servlet.DispatcherType; import javax.servlet.RequestDispatcher; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.util.Arrays; import java.util.Collections; import java.util.Date; import java.util.HashSet; import java.util.Set; /** * Abstract default servlet implementation for serving static content. * This is both a handler and a servlet. If no filters * match the current path then the content will be served up asynchronously using the * {@link io.undertow.server.HttpHandler#handleRequest(io.undertow.server.HttpServerExchange)} method, * otherwise the request is handled as a normal servlet request. * <p> * By default we only allow a restricted set of extensions. * <p> * * @author Stuart Douglas * @author Ondrej Zizka, zizka at seznam.cz */ public abstract class DefaultServlet extends HttpServlet { public static final String DIRECTORY_LISTING = "directory-listing"; public static final String DEFAULT_ALLOWED = "default-allowed"; public static final String ALLOWED_EXTENSIONS = "allowed-extensions"; public static final String DISALLOWED_EXTENSIONS = "disallowed-extensions"; public static final String RESOLVE_AGAINST_CONTEXT_ROOT = "resolve-against-context-root"; private static final Set<String> DEFAULT_ALLOWED_EXTENSIONS = Collections.unmodifiableSet(new HashSet<>(Arrays.asList( "js", "css", "png", "jpg", "gif", "html", "htm", "txt", "pdf", "jpeg", "xml", "svg", "ttf", "java"))); private Deployment deployment; private ResourceManager resourceManager; private final Settings settings = new Settings(); public Settings getSettings() { return settings; } @Override public void init(ServletConfig config) throws ServletException { super.init(config); ServletContextImpl sc = (ServletContextImpl) config.getServletContext(); this.deployment = sc.getDeployment(); // Settings from the servlet init parameters. if (config.getInitParameter(DEFAULT_ALLOWED) != null) { settings.defaultAllowed = Boolean.parseBoolean(config.getInitParameter(DEFAULT_ALLOWED)); } if (config.getInitParameter(ALLOWED_EXTENSIONS) != null) { String extensions = config.getInitParameter(ALLOWED_EXTENSIONS); settings.allowed = new HashSet<>(Arrays.asList(extensions.split(","))); } if (config.getInitParameter(DISALLOWED_EXTENSIONS) != null) { String extensions = config.getInitParameter(DISALLOWED_EXTENSIONS); settings.disallowed = new HashSet<>(Arrays.asList(extensions.split(","))); } if (config.getInitParameter(RESOLVE_AGAINST_CONTEXT_ROOT) != null) { settings.resolveAgainstContextRoot = Boolean.parseBoolean(config.getInitParameter(RESOLVE_AGAINST_CONTEXT_ROOT)); } String listings = config.getInitParameter(DIRECTORY_LISTING); if (Boolean.valueOf(listings)) { settings.directoryListingEnabled = true; } // Settings from the deployment configuration. DefaultServletConfig defaultServletConfig = getDeployment().getDeploymentInfo().getDefaultServletConfig(); if (defaultServletConfig != null) { getSettings().setDefaultAllowed(defaultServletConfig.isDefaultAllowed()); getSettings().setAllowed(new HashSet<>()); if (defaultServletConfig.getAllowed() != null) { getSettings().getAllowed().addAll(defaultServletConfig.getAllowed()); } getSettings().setDisallowed(new HashSet<>()); if (defaultServletConfig.getDisallowed() != null) { getSettings().getDisallowed().addAll(defaultServletConfig.getDisallowed()); } } } @Override protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException { String path = getPath(req); if (!isAllowed(path, req.getDispatcherType())) { resp.sendError(StatusCodes.NOT_FOUND); return; } if(File.separatorChar != '/') { //if the separator char is not / we want to replace it with a / and canonicalise path = CanonicalPathUtils.canonicalize(path.replace(File.separatorChar, '/')); } final Resource resource; //we want to disallow windows characters in the path if(File.separatorChar == '/' || !path.contains(File.separator)) { resource = resourceManager.getResource(path); } else { resource = null; } if (resource == null) { if (req.getDispatcherType() == DispatcherType.INCLUDE) { //servlet 9.3 throw new FileNotFoundException(path); } else { resp.sendError(StatusCodes.NOT_FOUND); } return; } // Directory if (resource.isDirectory()) { if (!settings.directoryListingEnabled) resp.sendError(StatusCodes.FORBIDDEN); // /servlet-name/some/dir/?css or ?js if ("css".equals(req.getQueryString())) { resp.setContentType("text/css"); resp.getWriter().write(DirectoryUtils.Blobs.FILE_CSS); return; } else if ("js".equals(req.getQueryString())) { resp.setContentType("application/javascript"); resp.getWriter().write(DirectoryUtils.Blobs.FILE_JS); return; } StringBuilder output = DirectoryUtils.renderDirectoryListing(req.getRequestURI(), resource); resp.getWriter().write(output.toString()); } // File else { if(path.endsWith("/")) { //UNDERTOW-432 resp.sendError(StatusCodes.NOT_FOUND); return; } serveFileBlocking(req, resp, resource); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { /* * Where a servlet has received a POST request we still require the capability to include static content. */ switch (req.getDispatcherType()) { case INCLUDE: case FORWARD: case ERROR: doGet(req, resp); break; default: super.doPost(req, resp); } } @Override protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { switch (req.getDispatcherType()) { case INCLUDE: case FORWARD: case ERROR: doGet(req, resp); break; default: super.doPut(req, resp); } } @Override protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { switch (req.getDispatcherType()) { case INCLUDE: case FORWARD: case ERROR: doGet(req, resp); break; default: super.doDelete(req, resp); } } @Override protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { switch (req.getDispatcherType()) { case INCLUDE: case FORWARD: case ERROR: doGet(req, resp); break; default: super.doOptions(req, resp); } } @Override protected void doTrace(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { switch (req.getDispatcherType()) { case INCLUDE: case FORWARD: case ERROR: doGet(req, resp); break; default: super.doTrace(req, resp); } } protected void serveFileBlocking(final HttpServletRequest req, final HttpServletResponse resp, final Resource resource) throws IOException { final ETag etag = resource.getETag(); final Date lastModified = resource.getLastModified(); if(req.getDispatcherType() != DispatcherType.INCLUDE) { if (!ETagUtils.handleIfMatch(req.getHeader(Headers.IF_MATCH_STRING), etag, false) || !DateUtils.handleIfUnmodifiedSince(req.getHeader(Headers.IF_UNMODIFIED_SINCE_STRING), lastModified)) { resp.setStatus(StatusCodes.PRECONDITION_FAILED); return; } if (!ETagUtils.handleIfNoneMatch(req.getHeader(Headers.IF_NONE_MATCH_STRING), etag, true) || !DateUtils.handleIfModifiedSince(req.getHeader(Headers.IF_MODIFIED_SINCE_STRING), lastModified)) { resp.setStatus(StatusCodes.NOT_MODIFIED); return; } } //we are going to proceed. Set the appropriate headers if(resp.getContentType() == null) { if(!resource.isDirectory()) { final String contentType = deployment.getServletContext().getMimeType(resource.getName()); if (contentType != null) { resp.setContentType(contentType); } else { resp.setContentType("application/octet-stream"); } } } if (lastModified != null) { resp.setHeader(Headers.LAST_MODIFIED_STRING, resource.getLastModifiedString()); } if (etag != null) { resp.setHeader(Headers.ETAG_STRING, etag.toString()); } ByteRange range = null; long start = -1, end = -1; try { //only set the content length if we are using a stream //if we are using a writer who knows what the length will end up being //todo: if someone installs a filter this can cause problems //not sure how best to deal with this //we also can't deal with range requests if a writer is in use Long contentLength = resource.getContentLength(); if (contentLength != null) { resp.getOutputStream(); if(contentLength > Integer.MAX_VALUE) { resp.setContentLengthLong(contentLength); } else { resp.setContentLength(contentLength.intValue()); } if(resource instanceof RangeAwareResource && ((RangeAwareResource)resource).isRangeSupported()) { //TODO: figure out what to do with the content encoded resource manager range = ByteRange.parse(req.getHeader(Headers.RANGE_STRING)); if(range != null && range.getRanges() == 1) { start = range.getStart(0); end = range.getEnd(0); if(start == -1 ) { //suffix range long toWrite = end; if(toWrite >= 0) { if(toWrite > Integer.MAX_VALUE) { resp.setContentLengthLong(toWrite); } else { resp.setContentLength((int)toWrite); } } else { //ignore the range request range = null; } start = contentLength - end; end = contentLength; } else if(end == -1) { //prefix range long toWrite = contentLength - start; if(toWrite >= 0) { if(toWrite > Integer.MAX_VALUE) { resp.setContentLengthLong(toWrite); } else { resp.setContentLength((int)toWrite); } } else { //ignore the range request range = null; } end = contentLength; } else { long toWrite = end - start + 1; if(toWrite > Integer.MAX_VALUE) { resp.setContentLengthLong(toWrite); } else { resp.setContentLength((int)toWrite); } } if(range != null) { resp.setStatus(StatusCodes.PARTIAL_CONTENT); resp.setHeader(Headers.CONTENT_RANGE_STRING, range.getStart(0) + "-" + range.getEnd(0) + "/" + contentLength); } } } } } catch (IllegalStateException e) { } final boolean include = req.getDispatcherType() == DispatcherType.INCLUDE; if (!req.getMethod().equals(Methods.HEAD_STRING)) { HttpServerExchange exchange = SecurityActions.requireCurrentServletRequestContext().getOriginalRequest().getExchange(); if(range == null) { resource.serve(exchange.getResponseSender(), exchange, completionCallback(include)); } else { ((RangeAwareResource)resource).serveRange(exchange.getResponseSender(), exchange, start, end, completionCallback(include)); } } } private IoCallback completionCallback(final boolean include) { return new IoCallback() { @Override public void onComplete(final HttpServerExchange exchange, final Sender sender) { if (!include) { sender.close(); } } @Override public void onException(final HttpServerExchange exchange, final Sender sender, final IOException exception) { //not much we can do here, the connection is broken sender.close(); } }; } /** * Returns the canonicalized URL path. */ private String getPath(final HttpServletRequest request) { String servletPath; String pathInfo; if (request.getDispatcherType() == DispatcherType.INCLUDE && request.getAttribute(RequestDispatcher.INCLUDE_REQUEST_URI) != null) { pathInfo = (String) request.getAttribute(RequestDispatcher.INCLUDE_PATH_INFO); servletPath = (String) request.getAttribute(RequestDispatcher.INCLUDE_SERVLET_PATH); } else { pathInfo = request.getPathInfo(); servletPath = request.getServletPath(); } String result = pathInfo; if (result == null) { result = servletPath; } else if(settings.resolveAgainstContextRoot) { result = servletPath + CanonicalPathUtils.canonicalize(pathInfo); } else { result = CanonicalPathUtils.canonicalize(result); } if ((result == null) || (result.equals(""))) { result = "/"; } return result; } /** * @return true if the resource at the given path is allowed to be sent to the client. */ protected boolean isAllowed(String path, DispatcherType dispatcherType) { int pos = path.lastIndexOf('/'); final String lastSegment; if (pos == -1) { lastSegment = path; } else { lastSegment = path.substring(pos + 1); } if (lastSegment.isEmpty()) { return true; } int ext = lastSegment.lastIndexOf('.'); if (ext == -1) { //no extension return true; } final String extension = lastSegment.substring(ext + 1, lastSegment.length()); if (settings.defaultAllowed) { return !settings.disallowed.contains(extension); } else { return settings.allowed.contains(extension); } } public boolean isDirectoryListingEnabled() { return settings.directoryListingEnabled; } public void setDirectoryListingEnabled(boolean directoryListingEnabled) { settings.directoryListingEnabled = directoryListingEnabled; } public ResourceManager getResourceManager() { return resourceManager; } public void setResourceManager(ResourceManager resourceManager) { this.resourceManager = resourceManager; } public Deployment getDeployment() { return deployment; } protected static class Settings { private boolean directoryListingEnabled = false; private boolean defaultAllowed = true; private Set<String> allowed = DEFAULT_ALLOWED_EXTENSIONS; private Set<String> disallowed = Collections.emptySet(); private boolean resolveAgainstContextRoot; public boolean isDirectoryListingEnabled() { return directoryListingEnabled; } public void setDirectoryListingEnabled(boolean directoryListingEnabled) { this.directoryListingEnabled = directoryListingEnabled; } public boolean isDefaultAllowed() { return defaultAllowed; } public void setDefaultAllowed(boolean defaultAllowed) { this.defaultAllowed = defaultAllowed; } public Set<String> getAllowed() { return allowed; } public void setAllowed(Set<String> allowed) { this.allowed = allowed; } public Set<String> getDisallowed() { return disallowed; } public void setDisallowed(Set<String> disallowed) { this.disallowed = disallowed; } public boolean isResolveAgainstContextRoot() { return resolveAgainstContextRoot; } public void setResolveAgainstContextRoot(boolean resolveAgainstContextRoot) { this.resolveAgainstContextRoot = resolveAgainstContextRoot; } } } 

提供servlet的文件 （您将在web.xml使用的文件 ）：

 /* * JBoss, Home of Professional Open Source. * Copyright 2014 Red Hat, Inc., and individual contributors * as indicated by the @author tags. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.jboss.windup.web.fileservlet; import io.undertow.Undertow; import java.util.logging.Logger; import io.undertow.server.handlers.resource.FileResourceManager; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import java.io.File; import org.jboss.windup.web.addons.websupport.WebPathUtil; /** * Default servlet responsible for serving up files from a directory. * This is both a handler and a servlet. If no filters * match the current path, then the resources will be served up asynchronously using the * {@link io.undertow.server.HttpHandler#handleRequest(io.undertow.server.HttpServerExchange)} method, * otherwise the request is handled as a normal servlet request. * * <p> * By default we only allow a restricted set of extensions. * <p> * @author Ondrej Zizka, zizka at seznam.cz * @see Undertow's DefaultServlet */ public class FileDefaultServlet extends DefaultServlet { public static final String BASE_PATH = "base-path"; /** * Which directory should this servlet serve files from. */ private String basePath; @Override public void init(ServletConfig config) throws ServletException { super.init(config); initBasePath(); this.setResourceManager(new FileResourceManager(new File(basePath), 8*1024)); } private void initBasePath() throws ServletException { // Get base path (path to get all resources from) as init parameter. this.basePath = getInitParameter(BASE_PATH); this.basePath = WebPathUtil.expandVariables(this.basePath); // Validate base path. if (this.basePath == null) { throw new ServletException("FileServlet init param 'basePath' is required."); } else { File path = new File(this.basePath); if (!path.exists()) { throw new ServletException("FileServlet init param 'basePath' value '" + this.basePath + "' does actually not exist in file system."); } else if (!path.isDirectory()) { throw new ServletException("FileServlet init param 'basePath' value '" + this.basePath + "' is actually not a directory in file system."); } else if (!path.canRead()) { throw new ServletException("FileServlet init param 'basePath' value '" + this.basePath + "' is actually not readable in file system."); } } } } 

这里有一个像以前的DefaultServlet一样工作的servlet，也就是从部署服务。

 /* * JBoss, Home of Professional Open Source. * Copyright 2014 Red Hat, Inc., and individual contributors * as indicated by the @author tags. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package io.undertow.servlet.handlers; import javax.servlet.DispatcherType; import javax.servlet.ServletConfig; import javax.servlet.ServletException; /** * Default servlet responsible for serving up resources. This is both a handler and a servlet. If no filters * match the current path then the resources will be served up asynchronously using the * {@link io.undertow.server.HttpHandler#handleRequest(io.undertow.server.HttpServerExchange)} method, * otherwise the request is handled as a normal servlet request. * <p> * By default we only allow a restricted set of extensions. * <p> * todo: this thing needs a lot more work. In particular: * - caching for blocking requests * - correct mime type * - range/last-modified and other headers to be handled properly * - head requests * - and probably heaps of other things * * @author Ondrej Zizka, zizka at seznam.cz */ public class ResourceDefaultServlet extends DefaultServlet { @Override public void init(ServletConfig config) throws ServletException { super.init(config); this.setResourceManager(getDeployment().getDeploymentInfo().getResourceManager()); } @Override protected boolean isAllowed(String path, DispatcherType dispatcherType) { if (!path.isEmpty()) { if(dispatcherType == DispatcherType.REQUEST) { //WFLY-3543 allow the dispatcher to access stuff in web-inf and meta inf if (path.startsWith("/META-INF") || path.startsWith("META-INF") || path.startsWith("/WEB-INF") || path.startsWith("WEB-INF")) { return false; } } } return super.isAllowed(path, dispatcherType); } }