*     at java.net.URL.<init>(URL.java:480)
     *     at java.net.URL.<init>(URL.java:376)
     *     at java.net.URL.<init>(URL.java:330)
     *     at jcifs.smb.SmbFile.<init>(SmbFile.java:355)
     *     ...
     * </pre>
     * </blockquote>
     */
    public static void registerSmbURLHandler() {
        SingletonContext.registerSmbURLHandler();
    }

    /**

labels.createdTime=创建时间
labels.depth=深度
labels.excludedPaths=要从爬网中排除的路径
labels.excludedUrls=要从爬网中排除的URL
labels.excludedDocPaths=要从搜索中排除的路径
labels.excludedDocUrls=要从搜索中排除的URL
labels.hostname=主机名
labels.id=ID
labels.includedPaths=要包含在爬网中的路径
labels.includedUrls=要包含在爬网中的URL
labels.includedDocPaths=要包含在搜索中的路径
labels.includedDocUrls=要包含在搜索中的URL
labels.maxAccessCount=最大访问数
labels.name=名称
labels.numOfThread=线程数
labels.duplicateHostName=重复名称

 *
 * <p>
 * This class defines the contract for delaying the crawling process at various points, such as:
 * </p>
 * <ul>
 *   <li>Before processing a URL ({@link #delayBeforeProcessing()})</li>
 *   <li>After processing a URL ({@link #delayAfterProcessing()})</li>
 *   <li>When there are no URLs in the queue ({@link #delayAtNoUrlInQueue()})</li>

                                    <label for="url" class="col-sm-2 text-sm-right col-form-label"><la:message
                                            key="labels.failure_url_search_url"/></label>
                                    <div class="col-sm-10">
                                        <la:text styleId="url" property="url" styleClass="form-control"></la:text>
                                    </div>

        @ValueSource(strings = { "smb://server/IPC$/foo", "smb://server/IPC$/PIPE/foo" })
        void constructsWithIpcShare(String url) throws Exception {
            // Arrange & Act
            SmbNamedPipe pipe = new SmbNamedPipe(url, SmbPipeResource.PIPE_TYPE_RDWR, ctx());

            // Assert: type is named pipe and pipe type preserved

        this.charset = charset;
    }

    /**
     * Executes a HEAD request for the given URL.
     * @param url The URL to request.
     * @return The ResponseData.
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);
            return responseData;

});
```

### Sitemap Support

```java
// Enable sitemap processing
container.singleton("sitemapsRule", SitemapsRule.class, rule -> {
    rule.addRule("url", ".*sitemap.*");
});

// Add sitemap URL
crawler.addUrl("https://example.com/sitemap.xml");
```

## Data Access and Storage

### Accessing Crawled Data

```java
// Get data service

    // ////////////////////////////////////////////////////////////////
    // from URL to File
    //
    /**
     * Copies from a URL to a file.
     *
     * @param in the URL (must not be {@literal null})
     * @param out the file (must not be {@literal null})
     * @return the number of bytes copied
     */
    public static int copy(final URL in, final File out) {
        assertArgumentNotNull("in", in);

     * @param childUrlList the set of child URLs
     * @param url the parent URL
     * @param depth the depth of the child URLs
     * @param encoding the encoding of the child URLs
     */
    protected void storeChildUrls(final CrawlerContext crawlerContext, final Set<RequestData> childUrlList, final String url,
            final int depth, final String encoding) {
        // add url and filter
        final Set<String> urlSet = new HashSet<>();

        @Override
        protected URLConnection openConnection(URL u) {
            return null; // not used
        }
    };

    @BeforeEach
    void setup() {
        when(ctx.getConfig()).thenReturn(config);
        when(ctx.getCredentials()).thenReturn(creds);
        when(ctx.getNameServiceClient()).thenReturn(nsc);
    }

    private static URL smbUrl(String spec) {
        try {