📄 lotterynumbers.java
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package coreservlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/** Example using servlet initialization and the
* getLastModified method.
* <P>
* Taken from Core Servlets and JavaServer Pages 2nd Edition
* from Prentice Hall and Sun Microsystems Press,
* http://www.coreservlets.com/.
* © 2003 Marty Hall; may be freely used or adapted.
*/
public class LotteryNumbers extends HttpServlet {
private long modTime;
private int[] numbers = new int[10];
/** The init method is called only when the servlet
* is first loaded, before the first request
* is processed.
*/
public void init() throws ServletException {
// Round to nearest second (i.e, 1000 milliseconds)
modTime = System.currentTimeMillis()/1000*1000;
for(int i=0; i<numbers.length; i++) {
numbers[i] = randomNum();
}
}
/** Return the list of numbers that init computed. */
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Your Lottery Numbers";
String docType =
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
"Transitional//EN\">\n";
out.println(docType +
"<HTML>\n" +
"<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=CENTER>" + title + "</H1>\n" +
"<B>Based upon extensive research of " +
"astro-illogical trends, psychic farces, " +
"and detailed statistical claptrap, " +
"we have chosen the " + numbers.length +
" best lottery numbers for you.</B>" +
"<OL>");
for(int i=0; i<numbers.length; i++) {
out.println(" <LI>" + numbers[i]);
}
out.println("</OL>" +
"</BODY></HTML>");
}
/** The standard service method compares this date
* against any date specified in the If-Modified-Since
* request header. If the getLastModified date is
* later or if there is no If-Modified-Since header,
* the doGet method is called normally. But if the
* getLastModified date is the same or earlier,
* the service method sends back a 304 (Not Modified)
* response and does <B>not</B> call doGet.
* The browser should use its cached version of
* the page in such a case.
*/
public long getLastModified(HttpServletRequest request) {
return(modTime);
}
// A random int from 0 to 99.
private int randomNum() {
return((int)(Math.random() * 100));
}
}
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