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JSP and Servlet Example Code
This handout containts simple examples of JSP and a Servlet.
JavaServer Pages Example
This page using JSP to using the Java Random class in a website:
<%-This is a simple JSP file than uses the Java Random Object to do a sum.
--%>
<%-- Notice that java.util.Random is imported in below --%>
<%@page contentType="text/html" pageEncoding="UTF-8" import="java.util.Random"
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<%-- JSP lets you put Java code your HTML,
it goes between the <% %> tags, and must write to out --%>
<%
out.println("Here is an example of a sum: ");
// Generated two random numbers using java.util.random
Random gen = new Random();
int x = gen.nextInt();
int y = gen.nextInt();
// Print their product
out.print(x+" times " +y+" = ");
out.println(x*y);
%>
</body>
</html>
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%>
Servlet Example
This servlet example writes a very simple webpage:
/*
* A very simple HTTPServlet.
* The page this servlet respondes to is set when the project is created
* When the webpage is requested the doGet method is called.
* Everything written to out is returned to the client as part of the
* HTTP response.
*/
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author tpc
*/
public class NewServlet extends HttpServlet {
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
String hello = "Hello World";
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet NewServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>"+ hello + "</h1>");
out.println("This webpage was generated dynamically.");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
}
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