June 2001
Intermediate to advanced
888 pages
21h 1m
English
You want an applet to run a CGI script.
Just use showDocument( ) with the correct URL.
It doesn’t matter what type of target your URL refers to. It can be an HTML page, a plain text file, a compressed tar file to be downloaded, a CGI script, servlet, or JavaServer Page (Chapter 18). In all cases, you simply provide the URL. The Java applet for this appears in Example 17-4.
Example 17-4. TryCGI.java
/**
* Try running a CGI-BIN script from within Java.
*/
public class TryCGI extends Applet implements ActionListener {
protected Button goButton;
public void init( ) {
add(goButton = new Button("Go for it!"));
goButton.addActionListener(this);
}
public void actionPerformed(ActionEvent evt) {
try {
URL myNewURL = new URL("http://server/cgi-bin/credit");
// debug...
System.out.println("URL = " + myNewURL);
// "And then a miracle occurs..."
getAppletContext( ).showDocument(myNewURL);
} catch (Exception err) {
System.err.println("Error!
showStatus("Error, look in Java Console for details!");
}
}
}Since this is an applet, it requires an HTML page to invoke it. I used the HTML shown here:
<HTML><HEAD> <TITLE>Java Applets Can Run CGI's (at least on Netscape Navigator)</TITLE> <BODY BGCOLOR="White"> <H1>Java Applets Can run CGI's (at least on Netscape Navigator)</H1> <P>Click on the button on this little Applet for p(r)oof! <APPLET CODE="TryCGI" WIDTH=100 HEIGHT=30> <P>If you can see this, you need to get a Java-powered(tm) Web Browser ...