visual basic 6.0 barcode generator 6: Crawling the Web with Java in Java

Creation PDF417 in Java 6: Crawling the Web with Java

6: Crawling the Web with Java
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if (link.indexOf("mailto:") != -1) { continue; } // Skip JavaScript links. if (link.toLowerCase().indexOf("javascript") != -1) { continue; }
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First, empty links are skipped so as not to waste any more time on them. Second, links that are simply anchors into a page are skipped by checking to see if the first character of the link is a hash (#). Page anchors allow for links to be made to a certain section of a page. Take, for example, this URL: http://osborne.com/#contact This URL has an anchor to the contact section of the page located at http://osborne.com. Links inside the page at http://osborne.com can reference the section relatively as just #contact . Since anchors are not links to new pages, they are skipped over. Next, mailto links are skipped. Mailto links are used for specifying an e-mail link in a Web page. For example, the link mailto:books@osborne.com is a mailto link. Since mailto links don t point to Web pages and cannot be crawled, they are skipped over. Finally, JavaScript links are skipped. JavaScript is a scripting language that can be embedded in Web pages for adding interactive functionality to the page. Additionally, JavaScript functionality can be accessed from links. Similar to mailto links, JavaScript links cannot be crawled; thus they are overlooked. As you ve just seen, the links in Web pages can take many formats, such as mailto and JavaScript formats. Additionally, traditional links inside Web pages can take a few different formats as well. Following are the three formats that traditional links can take: http://osborne.com/books/ArtofJava /books/ArtofJava books/ArtofJava The first of the three links shown here is considered to be a fully qualified URL. The second example is a shortened version of the first URL, omitting the host portion of the URL. Notice the slash (/) at the beginning of the URL. The slash indicates that the URL is what s called absolute. Absolute URLs are URLs that start at the root of a Web site. The third example is again a shortened version of the first URL, omitting the host portion of the URL. Notice that this third example does not have the leading slash. Since the leading
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slash is absent, the URL is considered to be relative. Relative, in the realm of URLs, means that the URL address is relative to the URL on which the link is found. The lines of code in the next section handle converting absolute and relative links into fully qualified URLs:
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// Prefix absolute and relative URLs if necessary. if (link.indexOf("://") == -1) { // Handle absolute URLs. if (link.charAt(0) == '/') { link = "http://" + pageUrl.getHost() + link; // Handle relative URLs. } else { String file = pageUrl.getFile(); if (file.indexOf('/') == -1) { link = "http://" + pageUrl.getHost() + "/" + link; } else { String path = file.substring(0, file.lastIndexOf('/') + 1); link = "http://" + pageUrl.getHost() + path + link; } } }
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First, the link is checked to see whether or not it is fully qualified by looking for the presence of "://" in the link. If these characters exist, the URL is assumed to be fully qualified. However, if they are not present, the link is converted to a fully qualified URL. As discussed, links beginning with a slash (/) are absolute, so this code adds "http://" and the current page s URL host to the link to fully qualify it. Relative links are converted here in a similar fashion. For relative links, the current page URL s filename is taken and checked to see if it contains a slash (/). A slash in the filename indicates that the file is in a directory hierarchy. For example, a file may look like this: dir1/dir2/file.html or simply like this: file.html In the latter case, "http://", the current page s URL host, and "/" are added to the link since the current page is at the root of the Web site. In the former case, the path (or directory) portion of the filename is retrieved to create the fully qualified URL. This case concatenates "http://", the current page s URL host, the path, and the link together to create a fully qualified URL.
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