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

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6: Crawling the Web with Java
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Next, page anchors and "www" are removed from the fully qualified link:
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// Remove anchors from link. int index = link.indexOf('#'); if (index != -1) { link = link.substring(0, index); } // Remove leading "www" from URL's host if present. link = removeWwwFromUrl(link);
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For the same reason that anchor-only links are skipped over, links with anchors tacked on to the end are skipped over. The leading "www" is also removed from links so that duplicate links are skipped over later in this method. Next, the link is verified to make sure it is a valid URL:
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// Verify link and skip if invalid. URL verifiedLink = verifyUrl(link); if (verifiedLink == null) { continue; }
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After validating that the link is a URL, the following code checks to see if the link s host is the same as the one specified by Start URL and checks to see if the link has already been crawled:
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/* If specified, limit links to those having the same host as the start URL. */ if (limitHost && !pageUrl.getHost().toLowerCase().equals( verifiedLink.getHost().toLowerCase())) { continue; } // Skip link if it has already been crawled. if (crawledList.contains(link)) { continue; }
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Finally, the retrieveLinks( ) method ends by adding each link that passes all filters to the link list.
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// Add link to list. linkList.add(link);
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} return (linkList);
After the while loop finishes and all links have been added to the link list, the link list is returned.
The searchStringMatches( ) Method
The searchStringMatches( ) method, shown here, is used to search through the contents of a Web page downloaded during crawling, determining whether or not the specified search string is present in the page:
/* Determine whether or not search string is present in the given page contents. */ private boolean searchStringMatches( String pageContents, String searchString, boolean caseSensitive) { String searchContents = pageContents; /* If case-sensitive search, lowercase page contents before comparison. */ if (!caseSensitive) { searchContents = pageContents.toLowerCase(); } // 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; }
6: Crawling the Web with Java
Because the search string can be either case insensitive (default) or case sensitive, searchStringMatches( ) starts out by declaring a local variable, searchContents, that refers to the string to be searched. By default, the pageContents variable is assigned to searchContents. If the search is case sensitive, however, the searchContents variable is set to a lowercased version of the pageContents string. Next, the search string is split into individual search terms using Java s regular expression library. To split the search string, first, a regular expression pattern is compiled with the Pattern object s static compile( ) method. The pattern used here, "[\\s]+", states that one or more white space characters (that is, spaces, tabs, or newlines) should be matched. Second, the compiled Pattern s split( ) method is invoked with the search string, which yields a String array containing individual search terms. After breaking the search string up, the individual terms are cycled through, checking to see if each term is found in the page s contents. The indexOf( ) method defined by String is used to search through the searchContents variable. A return value of 1 indicates that the search term was not found, and thus false is returned since all terms must be found in order to have a match. Notice that if the search is case insensitive, the search term is lowercased in the comparison. This coincides with the value assigned to the searchContents variable at the beginning of this method. If the for loop executes in its entirety, the searchStringMatches( ) method concludes by returning true, indicating that all terms in the search string matched.
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