Dr R Anurekha: JSP

HTML Form data and JSP

// HTML form to submit user name

<html>

<head>

<title>JSP and HTML Form data</title>

<style>

label

{

font-family:vivaldi;

font-size:x-large;

letter-spacing:2px;

line-height:40px;

font-weight:bold;

}

</style>

</head>

<body>

<form method="GET" action="JSPFormData.jsp">

<center>

<h2>JSP and HTML Form Data</h2></br>

<label>Enter Name </label>

<input type="text" Name="UN" tabindex=1/>

</br> </br>

<button type="Submit" >Click me!!! </button>

</center>

</form>

</body>

</html>

// JSPFormData.jsp

<html>

<body>

<h2><center>

<% out.println("Welcome "+ request.getParameter("UN")); %>

</center></h2>

</body>

</html>

JSP Expression Language

<%@ page import = "java.io.*,java.util.*" %>

<html>

<head>

<title>Application object in JSP</title>

</head>

<body>

<center><h2>

Integer count = (Integer)application.getAttribute("hitCounter");

if( count ==null || count == 0 )

{

out.println("Welcome to my website!");

count = 1;

}

else

{

out.println("Welcome back to my website!");

count += 1;

}

application.setAttribute("hitCounter", count);

<br/><br/>

<p>Total number of visits: <%= count%></p>

</h2></center>

</body>

</html>

JSP include directive

// JSPMP.jsp

<jsp:directive.include file="JSPHdr.jsp"/>

<jsp:directive.include file="JSPCon.jsp"/>

<jsp:directive.include file="JSPFtr.jsp"/>

// JSPHdr.jsp

<html>

<body>

<center><h2>

Header file - Welcome to JSP

</h2></center>

</body>

</html>

// JSPCon.jsp

<html>

<body>

<center><h2>

Content - This page is about JSP

</h2></center>

</body>

</html>

// JSPFtr.jsp

<html>

<body>

<center><h2>

Footer - Created by Anurekha

</h2></center>

</body>

</html>

JSP Page directive and include directive

<html>

<body>

<h2><center>

<%@ page import="java.util.*" %>

<% out.println((new Date()).toLocaleString()); %>

<br/>

<%@ page session="true" %>

<% out.println(session.getCreationTime()); %>

<br/>

<% out.println(request.getRequestURL()); %>

<br/>

<% out.println(session.getLastAccessedTime()); %>

<br/>

<% out.println(session.getMaxInactiveInterval()); %>

</center></h2>

<jsp:directive.include file="JSP1.jsp"/>

<jsp:directive.include file="wel.txt"/>

</body>

</html>

Simple JSP, Declaration, expression, control structures

<html>

<body>

<h2><center>

<% out.println("HELLO WORLD"); %>

<br/>

<jsp:scriptlet>

out.println("HELLO IT");

</jsp:scriptlet>

<br/>

<jsp:declaration>

int a=2, b=3;

int c=5;

int x, f=1;

</jsp:declaration>

<jsp:scriptlet>

x=a*b*c;

out.println("x = "+x);

</jsp:scriptlet>

<br/>

<%= a*a*a %>

<br/>

if (x%2==0)

{

out.println("EVEN");

}

else

{

out.println("ODD");

}

<br/>

for( int i=1;i<5;i++)

{

f = f*i;

}

out.println("factorial = "+f);

<br/>

</center></h2>

</body>

</html>

JSP Programs -- Page attributes

<html>

<head><title>Hello World</title></head>

<body>

<h2>

<%@ page import="java.util.*" %>

<%= (new Date()).toLocaleString()%>

<br/>

<%= request.getRemoteAddr() %>

<br/>

<%= session.getCreationTime() %>

</h2>

</body>

</html>