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Jsp (Java Server Page) Is a server side program.
Is called by client to provide a web service. Jsp is written in HTML rather than with the java programming languge jspInt() - provides customized functionality when the jsp is called jspDestroy() - provides customized functionality when the jsp is destroyed Service – is automatically called & retrieves a connection to HTTP.
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JSP Tags Consists of combination of HTML tags & jsp tags.
Jsp tags define java code that is to be executed before the output of the jsp program is sent to the browser. Tags begins with a <% …… %> Extended Markup Language(XML) version of jsp tags <jsp:TagID>……</jsp:TagID>
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Processed by JSP Virtual machine. (TOMCAT)
Tomcat reads the jsp program whenever the program is called by a browser & sends the HTML tags , related information to the browser.
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JSP Tags Comment tags : <% …….. %>
Declaration tags : <%! …….. %> Directive tags : ……… %> page import = import java.sql.*;%> Expression tags : <%= ……….. %> Scriptlet TAGS : controls & loops <% %>
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Variables & Objects <html> <head>
<title> jsp </title> </head> <body> <%! int age= 24;%> <p> Your age is : <%=age%> </body> </html>
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Methods <html> <head>
<title> jsp - methods</title> </head> <body> <%! int curve (int g) { return(10+g); } int curve1 (int a,int b) return(a+b); %> <p>Result : <%=curve(20)%> <p>Result1: <%=curve1(1,2)%> </body> </html>
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Control Statement <html> <head>
<title> jsp - control</title> </head> <body> <%! int g=60;%> <% if(g>=70) { %> <p> FIRST GRADE <% } else { %> <p> SECOND GRADE</p> <%}%> </body> </html>
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TOMCAT Jsp program executed by a JSP Virtual machine.
Tomcat is a JSP Virtual machine.
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Request String The browser generates a user request whenever the submit button is selected. String s= request.getParameter(fname); String h[]= request.getParameterValues(hobbies); Is used to parse a value of a specified value Four predefined implicit object request response session out – is an instance of the jspWriter that is used to send a response to the client.
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Parsing Other Information
The requested string send to the jsp by the browser is divided into two general components that are separated by the question mark. Left – url components Right – query string Methos used to parse URL information Protocol – http, https, ftp Host(ip address) Port Physical path
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