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 before you can watch for real. </APPLET> <HR> <P>Use <A HREF="MakeHTML.java">The Source</A>, Luke.
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