/*
* @(#)HelloWorld
*
* Copyright (c) 1999 Karl Moss. All Rights Reserved.
*
* You may study, use, modify, and distribute this software for any
* purpose provided that this copyright notice appears in all copies.
*
* This software is provided WITHOUT WARRANTY either expressed or
* implied.
*
* @author Karl Moss
* @version 1.0
* @date 17Feb99
*
*/
package javaservlets.nativeCode;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* This servlet uses native code to get a "Hello World" message
*/
public class HelloWorld extends HttpServlet
{
/**
* Use a static initializer to load the native code which
* is contained within a library. This initializer is
* called when the class loader first loads this class.
*/
static
{
System.out.println("Loading HelloWorld Library");
System.loadLibrary("HelloWorld");
}
/**
* Performs the HTTP GET operation
*
* @param req The request from the client
* @param resp The response from the servlet
*/
public void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws ServletException, java.io.IOException
{
// Set the content type of the response
resp.setContentType("text/html");
// Get the PrintWriter to write the response
java.io.PrintWriter out = resp.getWriter();
// Create the header
out.println("");
out.println("
");
out.println("Hello World Using Native Code");
out.println("");
out.println("");
out.println("Native code returning: " + getMessage());
out.println("
");
out.println("Native code inserts: ");
printMessage(out);
// Wrap up
out.println("");
out.println("");
out.flush();
}
/**
* Gets a message from a native library
* @return A message
*/
public native String getMessage();
/**
* Prints a message to the print stream
* @param out The print stream
*/
public native void printMessage(java.io.PrintWriter out);
/**
* Initialize the servlet. This is called once when the
* servlet is loaded. It is guaranteed to complete before any
* requests are made to the servlet
*
* @param cfg Servlet configuration information
*/
public void init(ServletConfig cfg)
throws ServletException
{
super.init(cfg);
}
/**
*
Destroy the servlet. This is called once when the servlet
* is unloaded.
*/
public void destroy()
{
super.destroy();
}
}