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GOOGLE API

GOOGLE API. Search requests: submit a query string and a set of parameters to the Google Web APIs service and receive in return a set of search results

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GOOGLE API

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  1. GOOGLE API • Search requests: submit a query string and a set of parameters to the Google Web APIs service and receive in return a set of search results • Cache requests: submit a URL to the Google Web APIs service and receive in return the contents of the URL when Google's crawlers last visited the page • Spelling requests: submit a query to the Google Web APIs service and receive in return a suggested spell correction for the query

  2. CSC 9010: Google API Dr. Paula Matuszek Paula_A_Matuszek@glaxosmithkline.com (610) 270-6851

  3. Search Requests • Some Parameter/value pairs that can be passed to the search request: • key: Required for you to access the Google service. Google uses the key for authentication and logging. • q: Query. (See Query Terms for details on query syntax.) • maxResults: Number of results desired per query. The maximum value per query is 10. • filter: Activates or deactivates automatic results filtering • restrict: Restricts the search to a subset of Google Web index. (See Restricts for more details.) • safeSearch: Enables filtering of adult content • lr:Language Restrict - Restricts the search within languages.

  4. Google Query Terms • General information: • Default Search: AND. The order of the terms in the query will impact the search results. • Stop Words: Google ignores stop words unless enclosed in quotes, such as in the phrase "to be or not to be". • Special Characters: Most non-alphanumeric characters are treated as word separators. • Exceptions are: • double quote mark ("): phrase search. May still ignore stop words. • plus sign (+) force inclusion of stop word • minus sign or hyphen (-): exclude term • ampersand (&): treated as another character in the query term

  5. Additional Google Query Terms • Google supports a variety of other special query terms, such as • Boolean OR Search: london OR paris • Site Restricted Search: site:www.stanford.edu • Date Restricted Search: daterange:2452122-2452234 • Title Search: intitle:Google search • URL Search (term) inurl:Google search • Back Links link:www.google.com • File Type Filtering Google filetype:doc

  6. Search Result Format The API returns a number of components, such as: • <documentFiltering> - A Boolean value indicating whether filtering was performed • <searchComments> - A text string intended for display to an end user. e.g.: a note that "stop words" were removed from the search automatically. <estimatedTotalResultsCount> - The estimated total number of results that exist for the query. • <resultElements> - An array of <resultElement> items. This corresponds to the actual list of search results. • <searchQuery> - This is the value of <q> for request. • <directoryCategories> - An array of <directoryCategory> items. This corresponds to the ODP directory matches

  7. Result Element The actual result returned has several fields, including: • <URL> - URL of the result, returned as text, absolute URL path. • <snippet> - A snippet which shows the query in context on the URL where it appears. This is formatted HTML and usually includes <B> tags within it. Note that the query term does not always appear in the snippet. • <title> - The title of the search result, returned as HTML. • <hostName> - When filtering occurs, a maximum of two results from any given host is returned. When this occurs, the second resultElement that comes from that host contains the host name in this parameter. • <directoryTitle> - If the URL for this resultElement is contained in the ODP directory, the title that appears in the directory appears here as a text string. Note that the directoryTitle may be different from the URL's <title>.

  8. Cache Requests • Cache requests submit a URL to the Google Web APIs service and receive in return the contents of the URL when Google's crawlers last visited the page (if available). • The return type for cached pages is base64 encoded text.

  9. Spelling Requests • Spelling requests submit a query to the Google Web APIs service and receive in return a suggested spell correction for the query (if available). Spell corrections mimic the same behavior as found on Google's Web site. • Spelling requests are limited to 2048 bytes and 10 individual words. • The return type for spelling requests is a text string.

  10. Google API Lab • The Google API has been installed on our lab PCs. The documentation for it has also been installed. The most relevant doc files for an overview are README.txt and APIs_Reference.html • The goal for this lab is to try out the API to conduct searches against Google. There are instructions in the readme file about various ways to try this. • FIRST, please read the license file (LICENSE.txt) so you know what we've agreed to in using the API. • Begin with java -cp googleapi.jar com.google.soap.search.GoogleAPIDemo <key> search <Foo> to try it out, then explore some of the other alternatives.

  11. Google API Lab Adminstrivia • We will use my key for this lab. It has a limit of 1000 queries/day, which is plenty for trying by hand but would be easy to exceed programmatically; please be careful. • There are additional query limits -- see docs. • I have verified with Google that using my key for the class is fine. If someone wants to do a more detailed project you should also request a key. • The Google API can be found at http://www.google.com/apis/

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