Servlets part1: Introduction

Session Contents

· Static Vs Dynamic Web Pages

· Servlet Basics

· Deploying Tomcat Web Container

· Setting up Tomcat with Eclipse

· Creating web application with Eclipse IDE

Dynamic webpages:

Dynamic sites, on the other hand, construct HTML pages on fly as they are requested, using server side scripting languages such as Servlets, JSP, PHP , ASP etc. Depending on the information site visitor requests for, the content for web pages is dynamically generated and if required, retrieving data from the database.

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JAVA

Java is arguably the most powerful platform for server-side web development today.

From small Java programs (Servlets) that handle Web page requests to Java Server Pages (JSPs) that combine HTML with custom tags and Java code, and even up to Enterprise JavaBeans (EJBs), software components with sophisticated abilities to carry information seamlessly across servers and

networks to accommodate distributed applications, Java is truly a hot technology.

The two widely used technologies for developing dynamic web pages are:

1. Servlets

2. JSP – Java Server Pages There are a lot of open source Java MVC frameworks which are built on top of the JSP/Servlet API and which are intended as an alternative/competition to JSF.

The popular ones being Spring MVC , Struts2 , JSP.etc

Java Server page tutorial part 3: JSP Life Cycle

JSP Life Cycle: A JSP life cycle can be defined as the entire process from its creation till the destruction which is similar to a servlet life cycle with an additional step which is required to compile a JSP into servlet. Following are the steps followed by a JSP Container: ◦ Compilation ◦ Parsing the JSP. ◦ Turning the JSP into a servlet. ◦ Compiling the servlet. ◦ Initialization ◦ Execution ◦ Cleanup Architecture: 1. JSP Compilation: When a browser asks for a JSP, the JSP engine first checks to see whether it needs to compile the page. If the page has never been compiled, or if the JSP has been modified since it was last compiled, the JSP engine compiles the page. The compilation process involves three steps: ◦ Parsing the JSP. ◦ Turning the JSP into a servlet. ◦ Compiling the servlet. 2. JSP Initialization: When a container loads a JSP it invokes the jspInit() method before servicing any requests. If you need to perform

OPERATION MANUAL FOR RS232 TO RS422/RS485 VICE-VERSA

INTRODUCTION: Milestone model LD-15U is a RS232, to RS422/RS485 converter is designed for high-speed data transmission between computer system and or peripherals over Iong distance under high noise conditions. They provide dual line interface per signal. APPLICATIONS: Application for these converters can be for factory automation, Programmable logic controllers,, attendance recording systems, Barcode Readers, remote data transmission, remote terminals, EPABX etc. SPECIFICATIONS: Input: RS232-T×D, R×D, DSR (for control), GND (D9 Female connector) Output: RS422/RS485-Tx+, Tx-, Rx+. Rx-(D9 Male Connector). Each signal is protected by spike suppressor, fuse and has opto-isolation. Selection Switch: 1. Rear side has 2-way'SELECT' switch for selecting 2-Wire or 4-Wire mode in RS422/RS485 application. 2. (Optional) Rear side has 3-way'SELECT' switch for selecting AUTO Mode (No Handshake Signal), DSR+ Mode (+12V Control) and DSR-Model (-_12V Control) for co

JSTL-JSP Standard Tag Library part 1

Evolution of JSTL: Java is a flexible, general-purpose programming language, JavaServer pages(JSP) depends on java but hides some of the hard details of writing full- fledged programs. The JSP Standards Tag Library(JSTL) builds on top of JSP, making it even easier to use. Architecture : In this figure large web applications are designed using java, JSTL, and othe components like databases. In large applications, it's common for requests from web browser to be handled by a java program called a servlet, which interacts with databases and other Java code on the server. The servlet figures out how it wants a response be printed and then forwards the user to the right JSTL page, which takes care of nothing more than presenting information. As JSP grew in popularity, it became clear that different sites' custom tags fell into familiar, frequently used patterns. For example, many pages needed to loop over data to print tables and lists. Vendors of JSP c

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