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CS506: Web Design and Development Handouts (PDF)
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CS506 Handouts pdf
Course Category: Computer Science/Information Technology CS506 HANDOUTS
Course Outline
Introduction to Java, Object-Oriented Programming, Classes, Inheritance, Polymorphism, Collections, Exceptions, Streams, Abstract Classes and Interfaces, Graphical User Interface, Event Handling, Database Connectivity, Meta Data Graphics, Applets, Socket Programming, Serialization, Multithreading, Web Application Development, Servlet, Java Server Pages, Java Beans, Model View Controller, Layers and Tiers, Java Server Pages Standard Tag Library, Java Server Faces, Web Services. CS506 Handouts pdf
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CS506 HANDOUTS
CS506: Web Design and Development
Design Goals of Java
The rapid growth of the Internet and the World Wide Web leads us to a completely new way of looking at software development that can work on different platforms like Windows, Linux, Solaris, etc. CS506 Handouts pdf
Java Program Development and Execution Steps
Java programs normally go through five phases. These are
- Edit,
- Compile,
- Load,
- Verify and
- Execute
Phase 1: Edit
Phase 1 involves file editing. This is accomplished through an editorial program. The editor types a java program that uses the editor as a notepad and makes adjustments if necessary. When the editor specifies that the file in the editor should be saved, the program is saved on the second storage device as a disk. The Java program filename ends with the .java extension. In the Windows platform, notepad is a simple and commonly used editor for beginners. However, integrated java development sites (IDEs) such as NetBeans, Borland JBuilder, JCreator, and IBM’s Eclipse Java built-in editors are integrated seamlessly into the editing space.
Phase 2: Compile
In step 2, the designer gives the command javac to assemble the system. The java compiler translates the java program into byte codes, which is the language understood by the java translator. To compile a program called Welcome.java type javac Welcome.java in your system command window. If the system is properly assembled, a file is called Welcome. Class is produced. This is a file containing byte codes that will be interpreted during the execution phase.
Phase 3: Loading
In Step 3, the program must first be in memory before it can be implemented. This is done by a class uploader, which takes a .class file (or files) containing byte codes and transfers it to memory. The .class file can be downloaded from disk to your system or network (such as your local university or company network or even the Internet). Applications (Applications) are downloaded to memory and made using the java translator by java command. When using a Java application called Welcome, the Java Welcome Request a translator of the Welcome program and causes the class uploader to load the information used in the Welcome application.
Phase 4: Verify
Before the byte codes in the application are used by the java translator, they are verified by a byte code verification in Step 4. This ensures that the class by-code of the downloaded class code (referred to as downloaded classes) is also valid and that they do not violate Java security limits. Java imposes strict security because java applications that come with the network should not be able to cause any damage to your files and system (as computer viruses can do).
Phase 5: Execute
Finally, in step 5, the computer, under the control of its CPU, translates the program code one by one at a time. Thus, to perform the actions specified by the system. Programs may not work at first. Each of the preceding sections may fail due to various errors. This will cause the java program to print an error message. The editor will return to the editing phase, make the necessary adjustments and proceed with the remaining sections to determine if the edits are working properly.
Web Application Development
Introduction
Due to the widespread use of the Internet, web-based applications become an integral part of the IT infrastructure for large organizations. For example, web-based employee performance management systems are used by organizations in weekly or monthly employee reviews. On the other hand, online registration and testing programs can allow students to study while living at home.
Web Applications
Typically, a web application is a piece of server-based code that helps a remote user connect to a web server with an HTTP protocol. The HTTP protocol follows the Request-Responsive non-response communication model. A client (usually a web browser) sends a request to the server, which returns the correct reply or error message. A web server is software that provides users with access to online services. These servers can provide support for many protocols used over the internet or intranet like HTTP, FTP, telnet, etc.
HTTP Basics
A protocol defines the method and method of communication between two parties. For example, when we talk to our teacher, we use a different method than we do with our friends or parents. Similarly, there are many different protocols that computers use to communicate with each other depending on the applications. For example, Echo Server only listens to incoming text messages and returns a greeting message, while the HTTP protocol uses different types of reply messages.
Java Servlets
Servlets are the answer to java technology in the CGI program. CGI was widely used to produce dynamic content before Servlets arrived. They were mostly C, C ++ programs running on a web server and used to build web pages. CS506 Handouts pdf
