JSP APP DEVLOPMENT.pptx Related to Android App Development
BhawnaSaini45
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Feb 26, 2025
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About This Presentation
Topic related to Android App Development.
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JSP APPLICATION DEVELOPMENT SUBMITTED TO : Dr.Gopal Singh DCSA , MDU,Rohtak SUBMITTED BY : B hawna M CA 2 ND SEM 23103
INTRODUCTION TO JSP PROBLEM WITH SERVLET Servlet is persistent until it destroys. One servlet is loaded into JVM. It does not matters the number of requests. When there is a request ,there is a thread , not a process. Designing in a servlet is difficult and slows down the application. You need a JRE (Java Runtime Environment) on the server to run servlets. HTML code is mixed up with JAVA code therefore changes done in one code can affect another code Developers must take care of the exception handling because servlet program is not thread-safe by default.
ANATOMY OF JSP PAGE JSP technology is used to create web application just like Servlet technology. It can be thought of as an extension to Servlet because it provides more functionality than servlet such as expression language, JSTL, etc. A JSP page consists of HTML tags and JSP tags. The JSP pages are easier to maintain than Servlet because we can separate designing and development. It provides some additional features such as Expression Language, Custom Tags, etc.
JSP Processing The web server have JSP engine which act as a container to process JSP pages. All the requests for JSP pages are intercepted by JSP container. JSP stands for Java Server Pages. All your JSP pages are stored on the server. JSP container along with web server provide the run time environment to JSP.
Advantages Of JSP 1) Extension to Servlet JSP technology is the extension to Servlet technology. We can use all the features of the Servlet in JSP. In addition to, we can use implicit objects, predefined tags, expression language and Custom tags in JSP, that makes JSP development easy. 2) Easy to maintain JSP can be easily managed because we can easily separate our business logic with presentation logic. 3) Fast Development: No need to recompile and redeploy If JSP page is modified, we don't need to recompile and redeploy the project. 4) Less code than Servlet In JSP, we can use many tags such as action tags, JSTL, custom tags, etc. that reduces the code. Moreover, we can use EL, implicit objects, etc.
The Directory Structure For JSP The directory structure of JSP page is same as Servlet. We contain the JSP page outside the WEB-INF folder or in any directory.
Creating To create the first JSP page, write some HTML code as given below, and save it by . jsp extension. We have saved this file as index.jsp . Put it in a folder and paste the folder in the web-apps directory in apache tomcat to run the JSP page. index.jsp Let's see the simple example of JSP where we are using the scriptlet tag to put Java code in the JSP page. We will learn scriptlet tag later. <html> <body> <% out.print (2*5); %> </body> </html> It will print 10 on the browser. A simple JSP page
How to run Follow the following steps to execute this JSP page: Start the server Put the JSP file in a folder and deploy on the server Visit the browser by the URL http://localhost:portno/contextRoot/jspfile , for example, http://localhost:8888/myapplication/index.jsp Do I need to follow the directory structure to run a simple JSP? No, there is no need of directory structure if you don't have class files or TLD files. For example, put JSP files in a folder directly and deploy that folder. It will be running fine. However, if you are using Bean class, Servlet or TLD file, the directory structure is required. a simple JSP page?
Creating a Simple JSP page <%@ page language="java" contentType ="text/html; charset=ISO-8859-1" pageEncoding ="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1" > <title> Insert title here </title> </head> <body> <% out.print (2 * 5); %> </body> </html> OUTPUT :
MVC in JSP Application with Example MVC MVC stands for Model-View-Controller. It is a design pattern used for developing web applications. It is a layout pattern used to isolate the information, presentation logic, business logic. Web application Logic is divided into three logics: Presentation Logic Business Logic Persistent Logic
Advantages of MVC The main advantage of using MVC in a Web Application is it makes complex applications easy to manage with divisions of Model, View, and Controllers. MVC provides a strong routing mechanism with a Front Controller pattern. MVC works well for development with large teams with multiple web developers and designers working simultaneously. In MVC, separating the model from View makes the web application more robust and easier to maintain. In MVC, separating the Controller from the Model allows configurable mapping of user actions on the Controller to application functions on the Model.
MVC in JSP Application we are showing how to use MVC architecture in JSP. In this example, we are creating an example in which servlet as a controller, JSP as a view component, Java Bean class as a model. In this example, we have created 6 pages. index.jsp ControllerServlet.java LoginBean.java login- success.jsp login- error.jsp web .xml
Example of MVC in JSP Application index.jsp helps us to get the input from the user. ControllerServlet.java acts as a controller, login- success.jsp and login- error.jsp file acts as a view component. Login- success.jsp page will show the “Welcome” message if the user will successfully login whereas login- error.jsp page will show the error message and returns you back to the index.jsp page. LoginBean.java acts as a Model Layer and a web.xml file is used to mapping the servlet. <%@ page language="java" contentType ="text/html; charset=ISO-8859-1" pageEncoding ="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1" > <title> Insert title here </title> </head> <body> <form action=" ControllerServlet " method="post" > Name: <input type="text" name="name" >< br > Password: <input type="password" name="password" >< br > <input type="submit" value="login" > </form> </body> </html> Index.jsp
Loginbean.java public class LoginBean { private String name, password; public String getName () { return name; } public void setName (String name) { this.name = name; } public String getPassword () { return password; } public void setPassword (String password) { this.password = password; } public boolean validate() { if ( password.equals ("admin")) { return true; } else { return false; } } } OUTPUT
login- succes.jsp <%@ page language="java“ contentType ="text/html; charset=ISO-8859-1" pageEncoding ="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http- equiv ="Content-Type" content="text/html; charset=ISO-8859-1" > <title></title> </head> <body> <% out.print ("Welcome"); %> </body> </html> OUTPUT
Loginerror.jsp <%@ page language="java“ contentType ="text/html; charset=ISO-8859-1" pageEncoding ="ISO-8859-1"%> <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1" > <title> Insert title here </title> </head> <body> <p> Sorry! username or password error </p> <%@ include file=" index.jsp "%> </body> </html> OUTPUT
Web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" xmlns ="http://java.sun.com/xml/ns/ javaee " xmlns:web ="http://java.sun.com/xml/ns/ javaee /web-app_2_5.xsd" xsi:schemaLocation ="http://java.sun.com/xml/ns/ javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id=" WebApp_ID " version="3.0" > <servlet> <servlet-name> s1 </servlet-name> <servlet-class> ControllerServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name> s1 </servlet-name> < url -pattern> / ControllerServlet </ url -pattern> </servlet-mapping> </web-app>
JSP Environment Setup Setting up the Java Development Kit Setting up Web Server: Tomcat Setting up CLASSPATH
Setting up the Java Development Kit Step1: It involves downloading an implementation of the Java Software Development Kit (SDK) and fixing the environment variable. You can download SDK from Oracle’s Java site by visiting the below URL: h ttps://www.oracle.com/java/technologies/javase-downloads.html Step2: You download your Java implementation, follow the given instructions to put in, and configure the setup. Finally set the JAVA_HOME environment variables to ask the directory that contains java and javac , typically java_install_dir /bin and java_install_dir respectively. set PATH = C:\jdk1.8.0_181\bin;%PATH% set JAVA_HOME = C:\jdk1.8.0_181
Setting up Web Server: Tomcat Apache Tomcat is an open-source software implementation of the JavaServer Pages and Servlet technologies. It should act as a standalone server for testing JSP and Servlets. It should be integrated with the Apache Web Server. Here are the steps to line up Tomcat on your machine − Download the latest version of Tomcat from https://tomcat.apache.org/ After downloading, unpack the binary distribution into a convenient location. For example, in C:\apache-tomcat-9.0 on windows After unpacking pointing to the same location create CATALINE_HOME environment variables.
Start Tomcat Server Tomcat is often started by executing the subsequent commands on the Windows machine: %CATALINA_HOME%\bin\startup.bat or C:\apache-tomcat-9.0\bin\startup.bat After a successful startup, the default web applications included with Tomcat are available by visiting http://localhost:8080/ Tomcat is often stopped by executing the subsequent commands on the Windows machine: %CATALINA_HOME%\bin\shutdown or C:\apache-tomcat-9.0\bin\shutdown
Setting up CLASSPATH Since servlets are not a part of the Java Platform, you need to identify the servlet classes to the compiler. If you’re running Windows, you would like to place the subsequent lines in your C:\autoexec.bat file. set CATALINA = C:\apache-tomcat-9.0 set CLASSPATH = %CATALINA%\common\lib\jsp-api.jar;%CLASSPATH%
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