Lpt-lab2

Faculty of ESBE

Internet Protocols & Technologies

Lab 2: JSP Web Applications The aim of this lab session is to develop simple JSP web applications that run on Tomcat web server.

Equipments: Two networked PCs with Red Hat Linux operating systems, logbook, and a USB memory stick for saving your work.

Exercises 1: 1. Create a JSP file called date1.jsp, and save it in the /opt/tomcat/webapps/test directory. <% // This is a scriptlet. Notice that the "date" // variable we declare here is available in the // embedded expression later on. System.out.println( "Evaluating date now" ); java.util.Date date = new java.util.Date(); %> Hello! The time is now <%= date %>

2. From the second computer, go to graphical desktop, open a web browser, and type in following URL: http://xxx.xxx.xxx.xxx:8080/test/date1.jsp , where xxx.xxx.xxx.xxx is the first computer’s IP address or domain name. Comment the results. 3. Create another JSP file called date2.jsp, and save it in the /opt/tomcat/webapps/test directory. <%@ page import=”java.util.*” %> <%@ page import=”java.text.*” %> <% Date date = new Date(); String today=DateFormat.getDateInstance().format(date); %> Today is: <em> <%= today %>

4. From the second computer, go to graphical desktop, open a web browser, and type in following URL: http://xxx.xxx.xxx.xxx:8080/test/date2.jsp , where xxx.xxx.xxx.xxx is the first computer’s IP address or domain name. Comment the results.

Dr. Perry XIAO

Copyright © 2000-2009, London South Bank University

1

Faculty of ESBE

Internet Protocols & Technologies

5. Create another JSP file called random.jsp, and save it in the /opt/tomcat/webapps/test directory. <%@ page language=”java” %> <%@ page import=”java.util.Random” %> <%! Random rand = new Random(); %> <%! public double getRandomNumber(){ return (rand.nextDouble()*1000); } %>

Here is a random number: <%=getRandomNumber() %>

And another: <%=getRandomNumber() %>

and one more: <%=getRandomNumber() %>

6. From the second computer, go to graphical desktop, open a web browser, and type in following URL: http://xxx.xxx.xxx.xxx:8080/test/random.jsp , where xxx.xxx.xxx.xxx is the first computer’s IP address or domain name. Comment the results. 7. Base on the above example, create a JSP web application called lottery.jsp, that can give six lottery numbers each time when you load the page, it should also show the date and time.

Exercises 2: 1. Create a HTML file called Login1.html, and save it in the /opt/tomcat/webapps/test directory.

Login name:
Password :

2. Create a JSP file called Login1.jsp, and save it in the /opt/tomcat/webapps/test directory.

Dr. Perry XIAO

Copyright © 2000-2009, London South Bank University

2

Faculty of ESBE

Internet Protocols & Technologies

<% String uname = request.getParameter("j_username"); String upass = request.getParameter("j_password"); %> <%! public String login(String uname, String upass){ String t=""; if (uname.compareTo("xiaop")==0 && upass.compareTo("letmein")==0){ t="Successful!"; } else{ t="Failed!"; } return t; } %>

Login <%= login(uname, upass) %>

3. From the second computer, go to graphical desktop, open a web browser, and type in following URL: http://xxx.xxx.xxx.xxx:8080/test/Login1.html, where xxx.xxx.xxx.xxx is the first computer’s IP address or domain name. Comment the results. 4. Modify the above two programs, so if login is successful it will display a welcome message and the system time (welcome.jsp), and if failed it will display an error message (error.html). Hint: use pageContext.forward(“welcome.jsp”) or pageContext.forward(“error.html”) within the if else structure.

References: 1. 2. 3. 4. 5. 6. 7. 8.

http://java.sun.com http://tomcat.apache.org/ http://www.linux-sxs.org/internet_serving/ http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPIntro.html http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/Servlets.html http://www.jsptut.com/ http://eent3.sbu.ac.uk/staff/xiaop David Harms, “JSP, Servlets, and MySQL”, ISBN: 0764547879, M&T Book, 2001 (http://www.covecomm.com/java). 9. Barry Burd, JSP: JavaServer Pages, ISBN:0764535358, M & T Books, 2001

Questions: 1. 2. 3. 4.

What are the main differences between JSP and Servlet? What is the Container in the context of JSP/Servlet technologies? How to declare variables in JSP? How to pass information between a HTML file and a JSP file?

Dr. Perry XIAO

Copyright © 2000-2009, London South Bank University

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