0
Introduction to Google API…
By Pratheepan Raveendranathan
 The Google Web APIs service is a beta web program that enables developers to
easily find and manipulate information on t...
What can you do with the API
 Developers can issue search requests to
Google's index of more than 3 billion web
pages.
 ...
To start using the API
 You need to,
 Download API Package from http://
www.google.com/apis/
 Create an account and get...
Contents of this package:
 googleapi.jar - Java library for accessing the Google Web APIs
service.
 GoogleAPIDemo.java -...
WSDL
Web Services Description Language
 The standard format for describing a web
service.
 Expressed in XML, a WSDL defi...
SOAP –
Simple Object Access Protocol
 SOAP stands for Simple Object Access Protocol
 SOAP is a communication protocol
 ...
Google API for Perl
SOAP:Lite
SOAP:Lite for Perl is a collection of Perl
modules which provides a simple and
lightweight i...
So How do I Query Google?
#!/usr/local/bin/perl –w
use SOAP::Lite;
# Configuration
$key = "Your Key Goes Here";
# Initiali...
Search Contd…
$result = $service
-> doGoogleSearch(
$key, # key
$query, # search query
0, # start results
10, # max result...
Name Description
key
Provided by Google, this is required for you to access the
Google service. Google uses the key for au...
restrict
Restricts the search to a subset of the Google Web
index, such as a country like "Ukraine" or a topic like
"Linux...
Now to Retrieve the Search
Results
if(defined($result->{resultElements})) {
print join "n",
"Found:",
$result->{resultElem...
Search.pl Output
Found:
University of Minnesota <b>Duluth</b> Welcomes You
http://www.d.umn.edu/
The University of Minneso...
Or, to get all elements:
foreach $temp (@{$result->{resultElements}}) {
print $temp->{snippet};
}
foreach $temp (@{$result...
How to get a spelling suggestion?
#!/usr/local/bin/perl -w
use SOAP::Lite;
# Configuration
$key = "Your Key Goes Here";
# ...
How do I get the results?
 Easy,
 The variable Correction will contain the spelling
suggestion, if Google has one, or it...
Spelling output
Enter a word
dulut
The suggested spelling for “Duluth” is:
duluth
How do I get a cached web page?
 Google has this feature that given a URL, it
will try to retrieve the web page from its
...
Example Contd…
#!/usr/local/bin/perl –w
use SOAP::Lite;
# Configuration
$key = "Your Key Goes Here";
# Initialize with loc...
How do I retrieve the results?
 This is going to be the same as the spelling
suggestion,
 So if the web page does exist ...
Search with other options:
Google has four topic restricts:
Topic<restrict> value
US. Government unclesam
Linux linux
Maci...
Search with Restrictions:
$result = $service
-> doGoogleSearch(
$key, # key
$query, # search query
0, # start results
10, ...
Search with Language
Restrictions
$result = $service
-> doGoogleSearch(
$key, # key
$query, # search query
0, # start resu...
Search with Language
Restrictions Contd…
Please Enter Search Item
der sturm
The search took 0.309039
The estimated Number ...
Tips on Querying Google
Default Search
By default, Google only returns pages that include all of the terms in the query st...
(The following Special Query table can
be found in the API Reference Section in
your Google API download)
Special Query
Capability
Example Query Description
Include Query Term Star Wars Episode +I
If a common word is essential t...
Boolean OR Search vacation london OR paris
Google search supports the Boolean "OR" operator.
To retrieve pages that includ...
Title Search
(term)
intitle:Google
search
If you prepend "intitle:" to a query term, Google search
restricts the results t...
URL Search
(all)
allinurl: Google search
Starting a query with the term "allinurl:" restricts the results
to those with al...
File Type
Exclusion
Google -filetype:doc -
filetype:pdf
The query prefix "-filetype:" filters the results to exclude
docum...
Other Interesting Issues
 Search for say “yahoo”, and look at the
estimated number of results.
 Wait for like a minute o...
Conclusion…
The API can be used as means of retrieving “information” and “Text” from the web.
Some interesting examples:
h...
Upcoming SlideShare
Loading in...5
×

Introduction to Google API - Focusky

331

Published on

The Google Web APIs service is a beta web program that enables developers to easily find and manipulate information on the web.
This PowerPoint is an Introduction to Google API.

Published in: Internet, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
331
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Introduction to Google API - Focusky"

  1. 1. Introduction to Google API… By Pratheepan Raveendranathan
  2. 2.  The Google Web APIs service is a beta web program that enables developers to easily find and manipulate information on the web.  Google Web APIs are for developers and researchers interested in using Google as a resource in their applications.  The Google Web APIs service allows software developers to query more than 3 billion web documents directly from their own computer programs.  Google uses the SOAP and WSDL standards to act as an interface between the user’s program and Google API.  Programming environments such as Java, Perl, Visual Studio .NET are compatible with Google API. Definitions from http:// www.google.com/apis/ What is Google API?
  3. 3. What can you do with the API  Developers can issue search requests to Google's index of more than 3 billion web pages.  and receive results as  structured data,  Estimated number of results, URL’s, Snippets, Query Time etc.  access information in the Google cache,  and check the spelling of words.
  4. 4. To start using the API  You need to,  Download API Package from http:// www.google.com/apis/  Create an account and get your license key  Install kit in your UMD account  And also need Soap::Lite  However, it is on all the csdev machines, so you don’t need to get it. IT is not on UB or Bulldog.
  5. 5. Contents of this package:  googleapi.jar - Java library for accessing the Google Web APIs service.  GoogleAPIDemo.java - Example program that uses googleapi.jar. dotnet/  Example .NET - programs that uses Google Web APIs.  APIs_Reference.html - Reference doc for the API. Describes semantics of all calls and fields.  Javadoc - Documentation for the example Java libraries.  Licenses - Licenses for Java code that is redistributed in this package.  GoogleSearch.wsdl -WSDL description for Google SOAP API.  soap-samples/
  6. 6. WSDL Web Services Description Language  The standard format for describing a web service.  Expressed in XML, a WSDL definition describes how to access a web service and what operations it will perform.  This is the most important file (only) to use the API with Perl.
  7. 7. SOAP – Simple Object Access Protocol  SOAP stands for Simple Object Access Protocol  SOAP is a communication protocol  SOAP is for communication between applications  SOAP is a format for sending messages  SOAP is designed to communicate via Internet  SOAP is platform independent  SOAP is language independent  SOAP is based on XML  SOAP will be developed as a W3C standard
  8. 8. Google API for Perl SOAP:Lite SOAP:Lite for Perl is a collection of Perl modules which provides a simple and lightweight interface to the SOAP both on client and server side.
  9. 9. So How do I Query Google? #!/usr/local/bin/perl –w use SOAP::Lite; # Configuration $key = "Your Key Goes Here"; # Initialize with local SOAP::Lite file $service = SOAP::Lite -> service('file:GoogleSearch.wsdl'); $query= “duluth”;
  10. 10. Search Contd… $result = $service -> doGoogleSearch( $key, # key $query, # search query 0, # start results 10, # max results "false", # filter: boolean "", # restrict (string) "false", # safeSearch: boolean "", # lr "", # ie "" # oe );
  11. 11. Name Description key Provided by Google, this is required for you to access the Google service. Google uses the key for authentication and logging. q Query Phrase. start Zero-based index of the first desired result. maxResults Number of results desired per query. The maximum value per query is 10. Note: If you do a query that doesn't have many matches, the actual number of results you get may be smaller than what you request. filter Activates or deactivates automatic results filtering, which hides very similar results and results that all come from the same Web host.
  12. 12. restrict Restricts the search to a subset of the Google Web index, such as a country like "Ukraine" or a topic like "Linux." safeSearch A Boolean value which enables filtering of adult content in the search results. lr Language Restrict - Restricts the search to documents within one or more languages. ie Input Encoding - this parameter has been deprecated and is ignored. All requests to the APIs should be made with UTF-8 encoding. oe Output Encoding - this parameter has been deprecated and is ignored. All requests to the APIs should be made with UTF-8 encoding.
  13. 13. Now to Retrieve the Search Results if(defined($result->{resultElements})) { print join "n", "Found:", $result->{resultElements}->[0]->{title}, $result->{resultElements}->[0]->{URL}, $result->{resultElements}->[0]->{snippet} . "n" } print "n The search took "; print $result->{searchTime}; print "nn"; print "The estimated Number of results for your query is: "; print $result->{estimatedTotalResultsCount}; print "nn"; What you need for your program
  14. 14. Search.pl Output Found: University of Minnesota <b>Duluth</b> Welcomes You http://www.d.umn.edu/ The University of Minnesota <b>Duluth</b> Homepage: an overview of academic prog rams, campus<br> life, resources, news and events, with extensive links to other web sites <b>...</b> The search took 0.159791 The estimated Number of results for your query is: 881000
  15. 15. Or, to get all elements: foreach $temp (@{$result->{resultElements}}) { print $temp->{snippet}; } foreach $temp (@{$result->{resultElements}}) { print $temp->{URL}; } foreach $temp (@{$result->{resultElements}}) { $title_array[$count++]=$temp->{title}; }
  16. 16. How to get a spelling suggestion? #!/usr/local/bin/perl -w use SOAP::Lite; # Configuration $key = "Your Key Goes Here"; # Initialize with local SOAP::Lite file $service = SOAP::Lite -> service('file:GoogleSearch.wsdl'); $correction = $service->doSpellingSuggestion($key,$searchString);
  17. 17. How do I get the results?  Easy,  The variable Correction will contain the spelling suggestion, if Google has one, or it would be empty if there is no suggestion  So Retrieving the result would be as easy as: print "n The suggested spelling for $searchString is $correction nn";
  18. 18. Spelling output Enter a word dulut The suggested spelling for “Duluth” is: duluth
  19. 19. How do I get a cached web page?  Google has this feature that given a URL, it will try to retrieve the web page from its “cache”.  So the actual contents of the page might be somewhat old, relative to when the web crawlers or Google did an update on the site  Example,
  20. 20. Example Contd… #!/usr/local/bin/perl –w use SOAP::Lite; # Configuration $key = "Your Key Goes Here"; # Initialize with local SOAP::Lite file $service = SOAP::Lite -> service('file:GoogleSearch.wsdl'); $url="http://www.d.umn.edu"; $cachedPage=$service->doGetCachedPage($key,$url);
  21. 21. How do I retrieve the results?  This is going to be the same as the spelling suggestion,  So if the web page does exist you will have the whole web page HTML in the “cachedWebpage” variable.  Otherwise, you would get a message from Google which says  “ This web page has not been updated…blah… blah…blah “
  22. 22. Search with other options: Google has four topic restricts: Topic<restrict> value US. Government unclesam Linux linux Macintosh mac FreeBSD bsd
  23. 23. Search with Restrictions: $result = $service -> doGoogleSearch( $key, # key $query, # search query 0, # start results 10, # max results "false", # filter: boolean "linux", # restrict (string) "false", # safeSearch: boolean "", # lr "", # ie "" # oe );
  24. 24. Search with Language Restrictions $result = $service -> doGoogleSearch( $key, # key $query, # search query 0, # start results 10, # max results "false", # filter: boolean "", # restrict (string) "false", # safeSearch: boolean "lang_de", # lr "", # ie "" # oe ); print "n The search took "; print $result->{searchTime}; print "nn"; print "The estimated Number of results for your query is: "; print $result->{estimatedTotalResultsCount}; print "nn"; if(defined($result->{resultElements})) { print join "n", "Found:", $result->{resultElements}->[0]->{title},$result->{resultElements}->[0]->{URL}, $result->{resultElements}->[0]->{snippet} . "n" } lang_de = Gernman
  25. 25. Search with Language Restrictions Contd… Please Enter Search Item der sturm The search took 0.309039 The estimated Number of results for your query is: 206000 Found: SK <b>STURM</b> GRAZ - Willkommen beim Sk <b>Sturm</b> http://www.sksturm.at/ Eintreten. Puntigamer das bierige Bier, Steiermark.com, Puma, Tipp3,<br> Autohaus Jakob Prügger, Graz - Hausmannstätten. © 2003 SkSturm <b>...</b>
  26. 26. Tips on Querying Google Default Search By default, Google only returns pages that include all of the terms in the query string. Stop Words Google ignores common words and characters such as "where" and "how," as well as certain single digits and single letters. Common words that are ignored are known as stop words. However, you can prevent Google from ignoring stop words by enclosing them in quotes, such as in the phrase "to be or not to be". Special Characters By default, all non-alphanumeric characters that are included in a search query are treated as word separators. The only exceptions are the following: double quote mark ("), plus sign (+), minus sign or hyphen (-), and ampersand (&). The ampersand character (&) is treated as another character in the query term in which it is included, while the remaining exception characters correspond to search features listed in the section below. Special Query Terms Google supports the use of several special query terms that allow the user or search administrator to access additional capabilities of the Google search engine. (The same Explanations can be found in the API Reference Section in your Google API download)
  27. 27. (The following Special Query table can be found in the API Reference Section in your Google API download)
  28. 28. Special Query Capability Example Query Description Include Query Term Star Wars Episode +I If a common word is essential to getting the results you want, you can include it by putting a "+" sign in front of it. Exclude Query Term bass -music You can exclude a word from your search by putting a minus sign ("-") immediately in front of the term you want to exclude from the search results. Phrase Search "yellow pages" Search for complete phrases by enclosing them in quotation marks or connecting them with hyphens. Words marked in this way will appear together in all results exactly as entered. Note: You may need to use a "+" to force inclusion of common words in a phrase.
  29. 29. Boolean OR Search vacation london OR paris Google search supports the Boolean "OR" operator. To retrieve pages that include either word A or word B, use an uppercase OR between terms. Site Restricted Search admission site:www.stanford.edu If you know the specific web site you want to search but aren't sure where the information is located within that site, you can use Google to search only within a specific web site. Do this by entering your query followed by the string "site:" followed by the host name. Date Restricted Search Star Wars daterange:2452122- 2452234 If you want to limit your results to documents that were published within a specific date range, then you can use the "daterange: " query term to accomplish this. The "daterange:" query term must be in the following format: daterange:<start_date>-<end date>
  30. 30. Title Search (term) intitle:Google search If you prepend "intitle:" to a query term, Google search restricts the results to documents containing that word in the title. Note there can be no space between the "intitle:" and the following word. Title Search (all) allintitle: Google search Starting a query with the term "allintitle:" restricts the results to those with all of the query words in the title. URL Search (term) inurl:Google search If you prepend "inurl:" to a query term, Google search restricts the results to documents containing that word in the result URL. Note there can be no space between the "inurl:" and the following word. To find multiple words in a result URL, use the "inurl:" operator for each word. Note: Putting "inurl:" in front of every word in your query is equivalent to putting "allinurl:" at the front of your query
  31. 31. URL Search (all) allinurl: Google search Starting a query with the term "allinurl:" restricts the results to those with all of the query words in the result URL. Text Only Search (all) allintext: Google search Starting a query with the term "allintext:" restricts the results to those with all of the query words in only the body text, ignoring link, URL, and title matches. Links Only Search (all) allinlinks: Google search Starting a query with the term "allinlinks:" restricts the results to those with all of the query words in the URL links on the page. File Type Filtering Google filetype:doc OR filetype:pdf The query prefix "filetype:" filters the results returned to include only documents with the extension specified immediately after. Note there can be no space between "filetype:" and the specified extension.
  32. 32. File Type Exclusion Google -filetype:doc - filetype:pdf The query prefix "-filetype:" filters the results to exclude documents with the extension specified immediately after. Note there can be no space between "-filetype:" and the specified extension. Web Document Info info:www.google.com  The query prefix "info:" returns a single result for the specified URL if it exists in the index. Back Links link:www.google.com  The query prefix "link:" lists web pages that have links to the specified web page. Note there can be no space between "link:" and the web page URL. Related Links related:www.google.com  The query prefix "related:" lists web pages that are similar to the specified web page. Note there can be no space between "link:" and the web page URL. Cached Results Page cache:www.google.com web The query prefix "cache:" returns the cached HTML version of the specified web document that the Google search crawled. Note there can be no space between "cache:" and the web page URL. .
  33. 33. Other Interesting Issues  Search for say “yahoo”, and look at the estimated number of results.  Wait for like a minute or so.  Search again for “yahoo” and look at the estimated number of results.  The result, 5 out of 10 times, will be different.
  34. 34. Conclusion… The API can be used as means of retrieving “information” and “Text” from the web. Some interesting examples: http://www.googleduel.com/original.php http://douweosinga.com/projects/googlehacks http://www.researchbuzz.org/archives/001418.shtml http://cgi.sfu.ca/~gpeters/cgi-bin/pear/gender.php
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×