Google Hacks 2Nd Edition [Electronic resources] نسخه متنی

Hack 97. Program Google in Java

Programming the Google Web API in Java is a
snap, thanks to the functionality packed into the Google Web API
Developer's Kit .

Thanks to the Java Archive (JAR) file included in the Google Web API
Developer's Kit, programming the Google API in Java
couldn't be simpler. The
googleapi.jar archive includes
com.google.soap.search, a nice, clean wrapper
around the underlying Google SOAP, along with the Apache Software
Foundation's open source Crimson (http://xml.apache.org/crimson) XML parser and
Apache SOAP (http://xml.apache.org/soap/) stack, among
others.

In addition to the googleapi.jar file included in the Google API Developer's Kit, you'll need a copy of the Java 2 Platform, Standard Edition (J2SE, http://java.sun.com/downloads/) to compile and run this hack.

9.14.1. The Code

Save the following code to a file called
Googly.java:

// Googly.java
// Bring in the Google SOAP wrapper.
import com.google.soap.search.*;
import java.io.*;
public class Googly {
// Your Google API developer's key.
private static String googleKey = "insert key here";
public static void main(String[] args) {
// Make sure there's a Google query on the command line.
if (args.length != 1) {
System.err.println("Usage: java [-classpath classpath] Googly <query>");
System.exit(1);
}
// Create a new GoogleSearch object.
GoogleSearch s = new GoogleSearch( );
try {
s.setKey(googleKey);
s.setQueryString(args[0]); // Google query from the command-line
s.setMaxResults(10);
// Query Google.
GoogleSearchResult r = s.doSearch( );
// Gather the results.
GoogleSearchResultElement[] re = r.getResultElements( );
// Output.
for ( int i = 0; i < re.length; i++ ) {
System.out.println(re[i].getTitle( ));
System.out.println(re[i].getURL( ));
System.out.println(re[i].getSnippet( ) + "\n");
}
// Anything go wrong?
} catch (GoogleSearchFault f) {
System.out.println("GoogleSearchFault: " + f.toString( ));
}
}
} Be sure to drop in your own Google developer's key
in place of insert key
here, like so:

// Your Google API developer's key.
private static String googleKey = " 12BuCK13mY5h0E/34KN0cK@ttH3Do0R
";

9.14.2. Compiling the Code

To successfully compile the Googly application,
you'll need that googleapi.jar
archive. I chose to keep it in the same directory as my
Googly.java source file; if you put it
elsewhere, adjust the path after -classpath
accordingly.

% javac -classpath googleapi.jar Googly.java This should leave you with a brand new
Googly.class file, ready to run.

9.14.3. Running the Hack

Run Googly on the command line ["How to Run the
Hacks" in the Preface], passing it your Google
query, like so under Unix and Mac OS X:

% java -classpath .:googleapi.jar Googly " query words " and like so under Windows (notice the ; instead of
: in the classpath):

java -classpath .;googleapi.jar Googly " query words "

9.14.4. The Results

% java -classpath .:googleapi.jar Googly "Learning Java"
oreilly.com -- Online Catalog: Learning Java
http://www.oreilly.com/catalog/learnjava/
For programmers either just migrating to Java or already working
steadily in the forefront of Java development, Learning Java gives
a clear, systematic ...
oreilly.com -- Online Catalog: Learning Java , 2nd Edition
http://www.oreilly.com/catalog/learnjava2/
This new edition of Learning Java has been expanded and updated for
Java 2 Standard Edition SDK 1.4. It comprehensively addresses ...
...
Java Programming...From the Grounds Up / Web Developer
http://www.webdeveloper.com/java/java_programming_grounds_upl
... WebDeveloper.com. Java Programming... From the Grounds Up. by
Mark C. Reynolds ... Java Classes and Methods. Java utilizes the
basic object technology found in C++. ...