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Introduction Servlets and JSP. Celsina Bignoli [email protected] Dynamic web pages. Content may change based on identity of the user user’s browser type information provided by the user selections made by the user. CGI. CGI (Common Gateway Inteface)

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Presentation Transcript
dynamic web pages
Dynamic web pages
  • Content may change based on
    • identity of the user
    • user’s browser type
    • information provided by the user
    • selections made by the user
slide3
CGI
  • CGI (Common Gateway Inteface)
    • outlines how a web server communicates with a program.
    • Typically written in Pearl (or C)
  • CGI scripting is not efficient
    • for every request the web server has to create a new process load an interpreter run the program and dispose of the process once done.
cgi improvements
CGI improvements
  • Fast-CGI
    • runs program in a external process or pool of processes
  • mod_perl, NSAPI, ISAPI
    • run server-side programs in the same process as the web server
    • available only on some web servers
servlets
Servlets
  • Server side Java programs
  • Solve scalability issue
    • serlvets are run on threads of execution not separate processes
  • Solve portability issue
    • runs on every platform that supports Java
    • supported by all most popular web servers
  • Issue
    • html tags are embedded in java programs within out.print() statements
slide6
JSP
  • server-side technology
  • separate dynamic content from static content of a page
    • Java scriptlets embedded into html-like page
  • Separate the work of
    • java programmers
    • page authors
jsp relationship to servlets
JSP relationship to Servlets

A JSP is converted into a Servlet

servlet example
Servlet Example

import java.text.*;

import java.util.*;

import

public class DateServlet extends HttpServlet{

public void doGet(HTTPServletRequest request,

HttpServletResponse response)

throws ServletException, IOException

{

response.setContentType(“text/html’);

PrintWriter out = response.getWriter();

out.println(“<html>”);

out.println(“<head><title><Date Example</title></head>”);

out.println(“<body>”);

out.println(“Today is: “);

Date d = new Date();

out.println(“<em>” + DateFormat.getInstance().format(d)+ “</em>”);

out.println(“<body>”);

out.println(“</html>”);

}

}

embedded HTML

jsp example

<%

Date d=new Date();

String today = DateFormat.getInstance().format(d);

%>

JSP Example

JSP tag

<%@ page import=“java.text.*’, java.util.*”%>

<html>

HTML

<head><title><Date Example</title></head>

<body>

Scriptlet

Today is:

<em><%=today%></em>

</body>

</html>

Example.jsp

  • Static: HTML/XML elements
  • Dynamic: scriptlets
  • Additional: special JSP elements
jsp alternatives
JSP alternatives
  • Active Server Pages
    • allows you to add VBScript or JScript code to the page
    • primarily a solution for te Windows platform
  • PHP
    • open source web-scripting language.
    • extensive set of predifined functions to access databases, LDAP directories, mail servers etc…
    • widely supported
  • ColdFusion
    • ColdFusion Markup Language(CFML) accessing databases, files, mail servers etc…
    • custom elements can be developed in C++ or Java
jsp unique features
JSP Unique Features
  • JSP is a specification, not a product
    • competing implementations
  • integral part of J2EE
    • access all features of the Java language
how to get started
How to get Started
  • Install JDK 5.0
  • Download Apache Tomcat 5.5 from:

www.apache.org

  • Use a regular editor or an IDE that supports JSP development
    • Eclipse
    • JBuilder
    • JCreator
    • Oracle JDeveloper
    • NetBeans
    • Macromedia DreamWeaver
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