Using Applets as Front Ends to Server-Side Programs
**************************************************
SearchApplet.java An applet that searches multiple search engines,
displaying the results in side-by-side frame cells. Uses the following files:
SearchSpec.javaParallelSearches.htmlSearchAppletFrame.htmlGoogleResultsFrame.htmlInfoseekResultsFrame.htmlLycosResultsFrame.html
***************************************************
//
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
//
/** An applet that reads a value from a TextField,
* then uses it to build three distinct URLs with embedded
* GET data: one each for Google, Infoseek, and Lycos.
* The browser is directed to retrieve each of these
* URLs, displaying them in side-by-side frame cells.
* Note that standard HTML forms cannot automatically
* perform multiple submissions in this manner.
*
* Taken from Core Web Programming Java 2 Edition
* from Prentice Hall and Sun Microsystems Press,
* May be freely used or adapted.
*/
public class SearchApplet extends Applet
implements ActionListener {
private TextField queryField;
private Button submitButton;
public void init() {
setBackground(Color.white);
setFont(new Font("Serif", Font.BOLD, 18));
add(new Label("Search String:"));
queryField = new TextField(40);
queryField.addActionListener(this);
add(queryField);
submitButton = new Button("Send to Search Engines");
submitButton.addActionListener(this);
add(submitButton);
}
/** Submit data when button is pressed or
* user presses Return in the TextField.
*/
public void actionPerformed(ActionEvent event) {
String query = URLEncoder.encode(queryField.getText());
SearchSpec[] commonSpecs = SearchSpec.getCommonSpecs();
// Omitting HotBot (last entry), as they use JavaScript to
// pop result to top-level frame. Thus the length-1 below.
for(int i=0; i