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// Split search string into individual terms. Pattern p = Pattern.compile("[\\s]+"); String[] terms = p.split(searchString); // Check to see if each term matches. for (int i = 0; i < terms.length; i++) { if (caseSensitive) { if (searchContents.indexOf(terms[i]) == -1) { return false; } } else { if (searchContents.indexOf(terms[i].toLowerCase()) == -1) { return false; } } } return true; } // Perform the actual crawling, searching for the search string. public void crawl( String startUrl, int maxUrls, boolean limitHost, String searchString, boolean caseSensitive) { // Set up crawl lists. HashSet crawledList = new HashSet(); LinkedHashSet toCrawlList = new LinkedHashSet(); // Add start URL to the to crawl list. toCrawlList.add(startUrl); /* Perform actual crawling by looping through the To Crawl list. */ while (crawling && toCrawlList.size() > 0) { /* Check to see if the max URL count has been reached, if it was specified.*/ if (maxUrls != -1) { if (crawledList.size() == maxUrls) { break; } } // Get URL at bottom of the list.
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6: Crawling the Web with Java
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String url = (String) toCrawlList.iterator().next(); // Remove URL from the To Crawl list. toCrawlList.remove(url); // Convert string url to URL object. URL verifiedUrl = verifyUrl(url); // Skip URL if robots are not allowed to access it. if (!isRobotAllowed(verifiedUrl)) { continue; } // Update crawling stats. updateStats(url, crawledList.size(), toCrawlList.size(), maxUrls); // Add page to the crawled list. crawledList.add(url); // Download the page at the given URL. String pageContents = downloadPage(verifiedUrl); /* If the page was downloaded successfully, retrieve all its links and then see if it contains the search string. */ if (pageContents != null && pageContents.length() > 0) { // Retrieve list of valid links from page. ArrayList links = retrieveLinks(verifiedUrl, pageContents, crawledList, limitHost); // Add links to the To Crawl list. toCrawlList.addAll(links); /* Check if search string is present in page, and if so, record a match. */ if (searchStringMatches(pageContents, searchString, caseSensitive)) { addMatch(url); } } // Update crawling stats.
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updateStats(url, crawledList.size(), toCrawlList.size(), maxUrls); } } // Run the Search Crawler. public static void main(String[] args) { SearchCrawler crawler = new SearchCrawler(); crawler.show(); } }
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The SearchCrawler Variables
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SearchCrawler starts off by declaring several instance variables, most of which hold references to the interface controls. First, the MAX_URLS String array declares the list of values to be displayed in the Max URLs to Crawl combo box. Second, disallowListCache is defined for caching robot disallow lists so that they don t have to be retrieved for each URL being crawled. Next, each of the interface controls is declared for the Search, Stats, and Matches sections of the interface. After the interface controls have been declared, the crawling flag is defined for tracking whether or not crawling is underway. Finally, the logFileWriter instance variable, which is used for printing search matches to a log file, is declared.
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When the SearchCrawler is instantiated, all the interface controls are initialized inside its constructor. The constructor contains a lot of code, but most of it is straightforward. The following discussion gives an overview. First, the application s window title is set with a call to setTitle( ). Next, the setSize( ) call establishes the window s width and height in pixels. After that, a window listener is added by calling addWindowListener( ), which passes a WindowAdapter object that overrides the windowClosing( ) event handler. This handler calls the actionExit( ) method when the application s window is closed. Next, a menu bar with a File menu is added to the application s window. The next several lines of the constructor initiate and lay out the interface controls. Similar to other applications in this book, the layout is arranged using the GridBagLayout class and its associated GridBagConstraints class. First, the Search section of the interface is laid out, followed by the Stats section. The Search section includes all the controls for entering the search criteria and constraints. The Stats section holds all the controls for displaying the current crawling status, such as how many URLs have been crawled and how many URLs are left to crawl. It s important to point out three things in the Search and Stats sections. First, the Matches Log File text field control is initialized with a string containing a filename. This string is set
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