Java Servlet Tutorial Java Programming Learn Java

Java Servlet Tutorial Java Programming Learn Java-Free PDF

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Java Servlet Tutorial i,Java Servlet Tutorial,Java Servlet Tutorial ii. 1 Introduction 1,1 1 Servlet Process 1,1 2 Merits 1. 2 Life Cycle 3,3 Container 5,3 1 Services 5,3 2 Servlet Container Configurations 5. 4 Demo To start with 6,5 Filter 12,5 1 Interface 12. 5 2 Example 13,6 Session 19,6 1 Session Handling 19.
6 2 Mechanisms of Session Handling 19,6 3 Example 20. 7 Exception Handling 23,7 1 Error Code Configuration 23. 7 2 Exception Type Configuration 23,8 Debugging 24. 8 1 Message Logging 24,8 2 Java Debugger 24,8 3 Headers 24. 8 4 Refresh 24,9 Internationalization 26,9 1 Methods 26.
9 2 Example 26,Java Servlet Tutorial iii,10 Reference 29. 11 Conclusion 30,12 Download 31,Java Servlet Tutorial iv. Copyright c Exelixis Media P C 2015, All rights reserved Without limiting the rights under. copyright reserved above no part of this publication. may be reproduced stored or introduced into a retrieval system or. transmitted in any form or by any means electronic mechanical. photocopying recording or otherwise without the prior written. permission of the copyright owner,Java Servlet Tutorial v. Java Servlets is a Java based web technology Java Servlet technology provides Web developers with a simple consistent. mechanism for extending the functionality of a Web server and for accessing existing business systems. A servlet can almost be thought of as an applet that runs on the server side without a face Java servlets make many Web. applications possible, Java Servlets comprise a fundamental part of the Java Enterprise Edition Java EE Please note that Java Servlets have to be.
executed inside a Servlet compatible Servlet Container e g web server in order to work. This tutorial works as a comprehensive kick start guide for your Java Servlet based code. Java Servlet Tutorial vi,About the Author, Kaushik has 16 years of experience as a technical architect and software consultant in enterprise application and product develop. ment He has interest in new technology and innovation area along with technical writing His main focus is on web architecture. web technologies java j2ee Open source big data and semantic technologies. He has demonstrated his expertise in requirement analysis architecture design implementation technical use case preparation. and software development His experience has spanned in different domains like Insurance banking airlines shipping document. management etc, Kaushik worked with a wide variety of technologies starting from Mainframe IBM S 390 midrange AS 400 web technologies. and open source area He has worked with clients like IBM Lexmark United Airlines and many more. Java Servlet Tutorial 1 31,Introduction, Servlet is a Java programming language class part of Java Enterprise Edition Java EE Sun Microsystems developed its first. version 1 0 in the year 1997 Its current Version is Servlet 3 1. Servlets are used for creating dynamic web applications in java by extending the capability of a server It can run on any web. server integrated with a Servlet container,1 1 Servlet Process. The process of a servlet is shown below,Figure 1 1 servlet processing of user requests.
A Request is sent by a client to a servlet container The container acts as a Web server. The Web server searches for the servlet and initiates it. The client request is processed by the servlet and it sends the response back to the server. The Server response is then forwarded to the client. 1 2 Merits, Servlets are platform independent as they can run on any platform. Java Servlet Tutorial 2 31, The Servlet API inherits all the features of the Java platform. It builds and modifies the security logic for server side extensions. Servlets inherit the security provided by the Web Server. In Servlet only a single instance of the requests runs concurrently It does not run in a separate process So it saves the. memory by removing the overhead of creating a new process for each request. Java Servlet Tutorial 3 31,Life Cycle, Servlet lifecycle describes how the servlet container manages the servlet object. Load Servlet Class, Servlet Instance is created by the web container when the servlet class is loaded. init This is called only once when the servlet is created There is no need to call it again and again for multiple requests. public void init throws ServletException, service It is called by the web container to handle request from clients Here the actual functioning of the code is done.
The web container calls this method each time when request for the servlet is received. It calls doGet doPost doTrace doPut doDelete and other methods. public void doGet HttpServletRequest request HttpServletResponse response. throws ServletException IOException, public void doPost HttpServletRequest request HttpServletResponse response. throws ServletException IOException, destroy It is used to clean resources and called before removing the servlet instance. public void destroy,Java Servlet Tutorial 4 31,Figure 2 1 Servlet Life Cycle. Java Servlet Tutorial 5 31, It is known as servlet engine which manages Java Servlet components on top of a web server to the request send by the client. 3 1 Services,Servlet Container provides the following services.
It manages the servlet life cycle, The resources like servlets JSP pages and HTML files are managed by servlet container. It appends session ID to the URL path to maintain session. Provides security service, It loads a servlet class from network services file systems like remote file system and local file system. 3 2 Servlet Container Configurations, The servlet container can be configured with the web server to manage servlets in three ways listed below. Standalone container,In process container,Out process container. Standalone container In this type the Web Server functionality is taken by the Servlet container Here the container is strongly. coupled with the Web server, In Process container In this the container runs within the Web server process.
Out Process container In this type there is a need to configure the servlet container to run outside the Web server process It is. used in some cases like if there is a need to run Servlets and Servlet container in different process systems. Java Servlet Tutorial 6 31,Demo To start with, Here is an example showing Demo Servlet Follow these steps to start with your first Servlet Application in NetBeansIDE. Step 1 Open NetBeansIDE File New Project WebApplication Set Project name as WebApplicationServletDemo. Figure 4 1 Create new WebApplication project in NetBeansIDE WebApplicationServletDemo. Step 2 Now click on Next as shown above This will create new project with the following directory structure. Java Servlet Tutorial 7 31, Figure 4 2 Project Directory after creating new project. Step 3 Create new servlet application by Right Clicking on Project Directory New Servlet. Figure 4 3 Adding Servlet file, Step 4 Add the Servlet Class Name as ServletDemo and click on Next. Java Servlet Tutorial 8 31,Figure 4 4 Adding Servlet Class Name. Step 5 Now Configure Servlet Deployment by checking Add information to deployment descriptor web xml and adding. URL Pattern the link visible as ServletDemo This step will generate web xml file in WEB INF folder. Figure 4 5 Configuring Servlet Deployment, Step 6 Click on Finish as shown above this will add ServletDemo java servlet under project directory Check the changes under.
Java Servlet Tutorial v Preface Java Servlets is a on the server side without a face Java servlets Servlets have to be executed inside a

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