Actions tags are used to do things without using Java inside the scriptlets.
They are used to control the flow between pages and to use Java Bean.
They can be used for specific task such as including other resource, forward the request to other resource (html/jsp/servlet), working with java bean objects
Following are the list of files used in example
header.jsp
index.jsp
page1.jsp
page2.jsp
header.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>Header</title>
</head>
<body>
<center>
<h1> Ravi R. Oza </h1>
<h4> Home Page </h4>
<hr>
</center>
</body>
</html>
index.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>JSP Action Tag Demo</title>
</head>
<body>
<jsp:include page="header.jsp"></jsp:include>
<form action="page1.jsp">
<h1>JSP Action Tag Demo</h1>
<hr>
<p> Enter your name
<input type="text" name="txtName">
</p>
<p>
<input type="submit" value="Go to Page1">
</p>
</form>
</body>
</html>
<%@ 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>Testing Action tags with JSP Param</title>
</head>
<body>
<jsp:include page="header.jsp"></jsp:include>
<h1>Testing Action tags with JSP Param</h1>
<hr>
<p> Name : <%=request.getParameter("txtName") %>
<p> Subject : <%= request.getParameter("txtSub") %>
</body>
</html>
Summary:
Actions tags are used to do things without using Java inside the scriptlets.
They are used to control the flow between pages and to use Java Bean.
They can be used for specific task such as including other resource, forward the request to other resource (html/jsp/servlet), working with java bean objects
OS : Windows 10 Jdk : Version 8 IDE : Eclipse Mars Server : Apache Tomcat 7
<%@ page
language="java"
contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"
errorPage="/myerror.jsp"
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSP Page Directives</title>
</head>
<body>
<h1>JSP Page Directives Demo</h1>
<h3>Ravi R. Oza</h3>
<hr/>
<%
String name = null;
int n = name.length();
// or try below
//int n=100/0;
%>
</body>
</html>
myerror.jsp
<%@ page isErrorPage="true" %>
<h1> OOPS, There is an Error</h1>
<h2> Please check the input or wait for server to response.</h2>
<font color="red">
<%= exception %>
</font>
Summary
It is used to provide instructions to a container that connect to current JSP page.
It defines page dependent properties/attributes such as scripting language, error page, etc., which communicates with the Web Container at the time of page translation.
OS : Windows 10 Jdk : Version 8 IDE : Eclipse Mars Server : Apache Tomcat 7
Inclusion of any java/html/jsp resource in jsp file
Following are the list of files used in example
index.jsp
header.html
footer.html
search.jsp
about.jsp
contact.jsp
index.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>JSP Include Tag Example</title>
</head>
<body>
<%@ include file="header.html" %>
<h2>Content of index page is this </h2>
<p> <p> <p> <p> <p> <p> <p> <p>
<%@ include file="footer.html" %>
</body>
</html>
<%@ 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 charset="ISO-8859-1">
<title>search</title>
</head>
<body>
<%@ include file="header.html" %>
<h2> SEARCH </h2>
Search : <input type="text">
<p> <p> <p> <p> <p> <p> <p> <p>
<%@ include file="footer.html" %>
</body>
</html>
about.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 charset="ISO-8859-1">
<title>contact</title>
</head>
<body>
<%@ include file="header.html" %>
<h3>About me </h3>
<h2> Myself Ravi R. Oza </h2>
<h4> Myself Educator, Blogger, YouTuber, Learner </h4>
<p> <p> <p> <p> <p> <p> <p> <p>
<%@ include file="footer.html" %>
</body>
</html>
contact.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 charset="ISO-8859-1">
<title>contact</title>
</head>
<body>
<%@ include file="header.html" %>
<h2>Contact me </h2>
<p> Mail me : Ravi.oza.it@gmail.com
<p> Follow me on Youtube @RaviROza
<p> <p> <p> <p> <p> <p> <p> <p>
<%@ include file="footer.html" %>
</body>
</html>
In this example index page used as home page. Header.jsp contains the header information such as website name, logo & menus. Footer.jsp contains the footer information such as quick links, company’s policies etc., Search.jsp is used to find the information from website. About.jsp is the page which holds the info related to company history & its objective past and future work Contact.jsp is the contact page which is useful when client want to communicate with the company.
Summary: JSP Include Directive is the best way to have reuseability, where a the content of one page or resources can be merged to existing Jsp
OS : Windows 10 Jdk : Version 8 IDE : Eclipse Mars Server : Apache Tomcat 7
If we declare them in declaration tag, both variables, objects & methods, they will be accessible throughout that page. It is used declare public objects or methods for the current page, every scriplet in current page can access it.
OS : Windows 10 Jdk : Version 8 IDE : Eclipse Mars Server : Apache Tomcat 7
Following are the files used in the JSP login example
index.jsp
login.jsp
welcome.jsp
sorry.jsp
Overall process of example: index.jsp page contains user interface to accept username and password from client side, when client submits the control transfer to the login.jsp file which contains the logic to validate username and password. If the client information is validated the control is transfer to welcome.jsp otherwise to sorry.jsp.
OS : Windows 10 Jdk : Version 8 IDE : Eclipse Mars Server : Apache Tomcat 7
RMI is an API that provides a mechanism to develop distributed app, objects on different computers can interact in a distributed network. It allows an object to invoke methods on an object running in another JVM. RMI is the Java version of what is generally known as a remote procedure call (RPC), but with the ability to pass one or more objects along with the request. The object can include information that will change the service that is performed in the remote computer. The RMI provides remote communication between the applications using two objects stub and skeleton.
Overall process of example: When a new user select the “Sign Up” option from the registration page the request is sent to the SignUP Servlet, the servlet read the values of username and password from request. The new user registration module has been linked with Login module.
Servlet defines the Database connection with valid database connection information.
Prepared statement is used to check the username and password exists in users table. then, the same prepared statement is used to add new user information in database.
OS : Windows 10 Jdk : Version 8 IDE : Eclipse Mars Database : MySQL using MySql Workbench 5.2 CE Server : Apache Tomcat 7
