Creating the visual interface in .NET framework

Drawer QR Code in .NET framework Creating the visual interface

NetBeans provides facilities for creating a visual user interface using components supplied by the Java swing or AWT (Abstract Window Toolkit) libraries Both libraries are part of the JFC (Java Foundation Classes) You can find more information about swing at

http://javasuncom/products/jdk/awt/

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Part VI: Appendixes Table C-1

What It Does Google developer key Search term or phrase Used to initiate Google search Displays snippet

Using the NetBeans visual development environment, you can add support for a MouseClicked event, fired when the search button is clicked The code that is executed when this event is processed will go in the jButtonSearchMouseClicked procedure The NetBeans development environment generates the code necessary to create an instance of these visual components, the form they are contained on, and to support the MouseClicked event I omit the generated code in this section, but you can download the entire Java class that contains it from wwwbraintiquecom/research/

In code, first you need to import the classes from the googleapijar library file:

import comgooglesoapsearch*;

The class that is used to create the form for the user interface is based on the swing JFrame class Within the framework code that has been generated for this class, specifically, within the search button s MouseClicked event, you should add the code to perform the Google search This code needs to go within a try catch block so that any error messages Google sends back can be captured and displayed For example, suppose there s a problem with a search because the Google developer key has been incorrectly entered The user of the application would certainly want to know why the search failed, so that the problem can be corrected Here s the framework for the try catch block:

try { } catch (GoogleSearchFault f) { jTextResultsetText( There has been a problem: }

+ f);

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The text of the GoogleSearchFault f argument passed to the catch block describes the error that occurred Within the try block, you need to create an instance of the GoogleSearch class:

GoogleSearch s = new GoogleSearch();

Set the developer key, the maximum number of results (in my case I set the max to one because I am only interested in the first snippet), and the search string:

ssetKey(jTextDevKeygetText()); ssetMaxResults(1); ssetQueryString(jTextSearchTermgetText());

I call the doSearch method of the GoogleSearch instance and store the result in a GoogleSearchResult variable:

GoogleSearchResult r = sdoSearch()

Using the getSnippet method of the first element in the GetResultElements array that is a member of the GoogleSearchResult, you then assign the text of the snippet to a String variable, str:

javalangString str = rgetResultElements()[0]getSnippet();

The snippets that Google returns tend to have nasty bits of HTML embedded in the text, such as <b> tags to mark the keywords that were found You can easily get rid of these using Java s excellent string-handling capabilities (using the replaceAll method of the String class):

str = strreplaceAll ( <b> , ); str = strreplaceAll ( </b> , ); str = strreplaceAll ( <br> , );

Finally, to display the cleaned-up snippet, enter the following code:

jTextResultsetText(str);

Listing C-1 shows the code for searching Google and returning the first snippet This listing offers a pretty good idea of how to go about coding a Java application that calls the googleapijar Java classes to use the Google APIs In Listing C-1, I ve omitted the generated code that NetBeans used to create the user interface for me You can see the code, including the generated code omitted from the listing, by downloading the entire Java formGoogleSearch class from wwwbraintiquecom/research/

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