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Introduction to Java Web Technologies (1.1 Intro to java Web Technologies,…

- - - - Functionality which deals with the display/interface of information
      - Component in Presentation logic layer
        
        Servlet
        -handle the presentation logic
        -page-to-page navigation dispatchers
        -provide session management
        -provide input validation
        -must be written in Java
        -call JSPs, EJB components, and JDBC objects
        
        JSP
        -handle most application display tasks
        work in conjunction with servlets to define the application’s presentation screens and page navigation
        
        Static Content
        -Images and HTML
        -Uniform appearance across different browsers
        -Efficient HTML loading across slow modem connections
        -Dynamically generated page appearances that are servlet or JSP dispatched
    - - Functionality which deals with the processing of information, the execution of commands and the coordination of application execution
      - EJB components
        
        Session bean
        -encapsulates business logic that can be invoked programmatically by a client over local, remote, or web service client views
        -performs work for its client, shielding it from complexity by executing business tasks inside the server
        
        Entity Beans
        -represent persistent objects, such as a database row (JDBC)
        
        Message-Driven Beans
        -persistent objects that are likely to call a full range of JDBC interfaces
        -message-driven beans have no local or remote interfaces as do other EJB components, and they different from entity beans in how they are accessed
    - - Functionality that makes it easy to access the data held in a data store such as a database
- - - - init()
        
        method that called only once.
        
        only when the servlet is created, and not called for any user requests afterwards
        
        User request resulting in a new thread that is handed off to doGet or doPost as appropriate