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Java_ J2EE_ JSP_ JDBC

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					    Modern Software
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Java™, J2EE™, JSP™, JDBC™
             by Radoslav Tr. Ivanov - 12835
           Contents
 Java™ language    J2EE™ components:
                      JSP™
 J2SE™ & J2EE™       Servlets™
                      JDBC™ & EJB™
                   Web Servers for J2EE™
 Business Systems
                   Resources
 J2EE™ Platform
    1. The Java™ language
                       ”... write once, run anywhere …”

•    History –1991 “Oak”- microprocessors ;
•    Necessity of platform independence ;
•    Advantages – suitable for WEB
            OOP-multi-platform, secure, simple and clear;
            inheritance, polymorphism, classification
            no need for garbage-collecting,
            near to “C++” ;

•    Disadvantages – slow ;
     A Java Program: From Birth to
               Execution
1.   Coding -Human-readable Java code is produced by the programmer
2.   Building - A Java Development Tool "build"s the Java program into
     byte-code, which is saved as a ".class" file.
3.   Loading - Via the web or command line, the class file is sent to the
     Java Virtual Machine (VM) with an attached digital signature. The
     Java VM is simply an interpreter.
4.   Bytecode Verification - The Java VM verifies the digital signature.
5.   Isolation - When downloaded remotely, the Java VM isolates the
     Java program in a restricted part of memory. The Java program is
     not allowed to access local Hard drives and System resources.
6.   Internal Integrity - Verification checks are made to insure that the
     loaded Java program is well formed. Data types are verified along
     with other syntax structure
7.   Execution - Program execution begins
Java™, J2EE™, JSP™, JDBC™

2. J2SE™ & J2EE ™
3. Business Systems
  •   Client   Server (DB) 2-tier ;
  •   Client  Application Sever  Server
      (DB) 3 tier ;
  •   N-tier ;
      4. The Middle Tier

•   Business logic
•   Presentation logic
                J2EE Platform
5.       J2EE components:
     •     Servlets™, JSP™, EJB™, JDBC™ etc.
6.       Java Servlets.
     •     Common with CGI ;
     •     Life cycle of Servlets -init(), service(), destroy() ;
     •     Advantages – good for Business logic;
     •     Disadvantages – It‟s not suitable for web design;
    7. Java Server Pages ™
•       Advantages over ASP™, PHP™, Servlets
•       Life cycle – converted to Servlet;
•       Tags
    •     <%-- “JSP comments”--%>
    1.     “<%! “Declarations” %>” ;
    2.    “<% “Code” %>” - Scriptlets;
    3.    “<%= „dynamic expression‟ %>” - Expressions;
         Example:
          <HTML>Current time: <%=new java.util.Date()%”>
            </HTML>
    Java Server Pages ™
•    Possible creating of new “<tags>”
    1. MyTags.tld – file of tags
    Example: <%@ taglib=“path to MyTags.tld”%>
•    Suitable for locale independence
   8. EJB™ & JDBC™
Java Data Base Connectivity (API) -
(driver) – implemented classes and
methods for managing Data Base (
Informix, MySQL, Oracle etc.)
EJB™ – Enterprise Java Beans™
   Example – shopping card
   9. Web Servers for
         J2EE™
Orion –http://www.orionserver.com

Jakarta TomCat ™
http://jakarta.apache.org/

Apache™ – http://apache.org/
          Resources
http://java.sun.com
http://java.sun.com/docs
http://www.javaworld.com
http://www.sun.com
http://java.sun.com/j2ee
http://java.sun.com/j2ee/tutorial
http://developer.java.sun.com/
http://www.javacoffeebreak.com/tutorials/

				
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posted:10/1/2011
language:English
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