Showing posts sorted by date for query jsp. Sort by relevance Show all posts
Showing posts sorted by date for query jsp. Sort by relevance Show all posts
Wednesday, November 6, 2019
Tuesday, June 25, 2019
JSP Implicit Objects Presentation
JSP Implicit Objects Presentation
https://github.com/studyskymate/J2EEDemos/tree/master/WebContent/jspDemos
Question: Explain include
Directive and include Action of JSP. Answer: This is a very popular interview question
on JSP, which has been asked from a long time and still asked in the various
interview. This question is good to test some fundamental concept like
translation of JSP and difference between translation time and run time kind of
concept. Syntax
for include Directive is : <%@ include file="fileName" %> which means we are
including some file to our JSP Page when we use include directive contents of
included file will be added to calling JSP page at translation time means when
the calling JSP is converted to servlet ,all the contents are added to that
page one important thing is that any JSP page is compiled if we make any
changes to that particular page but if we have changed the included file or JSP
page the main calling JSP page will not execute again so the output will not be
according to our expectation, this one is the main disadvantage of using the
include directive that why it is mostly use to add static resources, like
Header and footer . Syntax for include action is <jsp:include
page=”relativeURL” /> It is a
runtime procedure means the result of the JSP page which is mentioned in
relative URL is appended to calling JSP at runtime on their response
object at the location where we have used this tag. So any changes made
to included page is being effected every time, this is the main advantage of
this action but only relative URL we can use here, because request and response
object is passed between calling JSP and included JSP.
JSP Implicit Objects Presentation
JSP Introduction presentation
JSP Introduction presentation
JSP Introduction
A JSP
page is a text document that contains two types of text: static data,
which can be expressed in any text-based format (such as HTML, SVG, WML, and XML), and JSP elements, which construct
dynamic content.
The recommended file extension for the source file of a JSP page is .jsp. The page can be composed of a top file that includes other files that contain either a complete JSP page or a fragment of a JSP page. The recommended extension for the source file of a fragment of a JSP page is . jspf.
JSP Introduction presentation
Monday, June 24, 2019
JSP Scripting elements
JSP Scripting elements
<%@ 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>
<h1>Java
Server Pages</h1>
<h2><a href="scriptlets.jsp">JSP Scripting Elements </a> </h2>
<h2><a href="implicit.jsp">Implicit Objects </a></h2>
<form action="implicit.jsp">
Name: <input type="text"
name="name">
<input type="submit"
value="Submit"><br/>
</form>
</body>
</html>
scriptlets.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>
<h2> JSP
Scripting Elements </h2>
<h2>JSP scriptlet
tag </h2>
<% out.print("Welcome to JP"); %>
<br/>
<% out.print("Welcome to JSP "+ request.getParameter("name")); %>
<br/>
<h1> JSP
expression tag </h1>
<!--
need not write out.print() -->
<%= "Todays Date " %>
<br/>
<%=java.util.Calendar.getInstance().getTime() %>
<h1>JSP
Declaration Tag</h1>
<%! int data=10;%>
<%= data %>
</body>
</html>
How it interprets the data, check below:
How it interprets the data, check below:
JSP Scripting Elements
JSP scriptlet tag
<% out.print("Welcome to JP"); %><% out.print("Welcome to JSP "+ request.getParameter("name")); %>
JSP expression tag
<%= "Todays Date " %><%=java.util.Calendar.getInstance().getTime() %>
JSP Declaration Tag
<%! int data=10;%> <%= data %>Friday, June 21, 2019
Request Dispatcher Servlet example in creating simple Login Form
Use Request Dispatcher Servlet in creating simple Login Form
We are going to create a Login Form Here. At the end of this section, you will be able to use Request Dispatcher Servlet to forward the request to another webpage based on your inputs.
Step 1:
Create a Dynamic Web Project in IDE. For Example, here I am using eclipse to create a Dynamic Web Project.
If you do not have eclipse use below link to download the eclipse for Enterprise Edition.:
https://www.eclipse.org/downloads/packages/release/kepler/sr2/eclipse-ide-java-ee-developers
Give Proper Name to your project according to you.
Here in the Target runtime (Picture below), you can see Apache Tomcat v8.5. It is Server which is required to run Dynamic Web Applications or Enterprise Applications.
If it is not present or shown Empty then you have to Download the Server
i.e Apache Tomcat or Weblogic or any other server and have to link in the New RunTime Button Link.
Next Click on Next and Finish.
Below is the Final Structure of the project.
You need to create below files:
1. Login and Success Servlet Class.
2. home and success.jsp for the login page and if credentials are correct then forward it to the success page.
Step 2:
Create home.jsp file under webContent.
Content of home.jsp file.
It contains the code for Simple Login Form.
<form action="Login" method="post">Here action means when user submit this form then Login Servlet will be invoked and it find the post method in the Login 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>
<h1>Login form</h1>
<div>
<form action="Login"
method="post">
<table>
<tr>
<td>Name :</td>
<td><input type="text" name="userName"
/> </td>
</tr>
<tr>
<td>Password
:</td>
<td><input type="password" name="userPass"/></td>
</tr>
<tr>
<td><input type="submit" value="login"
/></td>
</tr>
</table>
</form>
</div>
</body>
</html>
home.jsp file snapshot
Step 3:
Create Login.java Servlet
Login Servlet:
package
com.studyskymate.dinesh.servlet.login;
import
java.io.IOException;
import
java.io.PrintWriter;
import
javax.servlet.RequestDispatcher;
import
javax.servlet.ServletException;
import
javax.servlet.annotation.WebServlet;
import
javax.servlet.http.HttpServlet;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
@WebServlet("/Login")
public class Login extends
HttpServlet {
private static final long serialVersionUID = 1L;
public Login()
{
super();
}
protected void
doPost(HttpServletRequest request,
HttpServletResponse response) throws
ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String name=request.getParameter("userName");
String password=request.getParameter("userPass");
if(name.equals("dinesh")
&& password.contentEquals("1234") ) {
RequestDispatcher rd =request.getRequestDispatcher("success");
//To handle it you need to create success servlet which we will create in next step
rd.forward(request, response);
}else {
out.print("Sorry
Invalid UserName or Password !");
RequestDispatcher rd=request.getRequestDispatcher("/home.jsp");
rd.include(request, response);
}
}
}
----------------------------------------------------------------------------------------------------------
Step 4
Create Success.java Servlet Similarly:
It will Invoke Login Servlet and if username and password are correct then it will forward the request to Success.jsp
import
java.io.IOException;
import
java.io.PrintWriter;
import
javax.servlet.RequestDispatcher;
import
javax.servlet.ServletException;
import
javax.servlet.annotation.WebServlet;
import
javax.servlet.http.HttpServlet;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
@WebServlet("/success")
public class Success
extends HttpServlet {
private static final long serialVersionUID = 1L;
public
Success() {
super();
}
protected void
doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
response.setContentType("text/html");
PrintWriter out= response.getWriter();
RequestDispatcher rd=request.getRequestDispatcher("/success.jsp");
rd.forward(request, response);
}
}
-----------------------------------------------------------------------------------------------------------------
Step 5.
Create success.jsp to capture the response from Success 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>
<div>
<h1>Welcome <font color="red"><%=request.getParameter("userName") %> </font> </h1>
<h2>You are
Valid User</h2>
<a href="/WebProject/home.jsp"><button type="button">Home Page</button></a>
</div>
</body>
</html>
----------------------------------------------------------------------
Step 6
web.xml file.
6.1 create web.xml file under WEB-INF folder if not present.
6.2 Add welcome file home.jsp or your index file statement in the web.xml
as below:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>WebProject</display-name>
<welcome-file-list>
<welcome-file>home.jsp</welcome-file>
</welcome-file-list>
</web-app>
--------------------------------------------------------------------
Step 7:
Run your project on Server.
Below Login Form will open after running the server at your browser.
Enter the correct Username and password.
In my case, it is dinesh and 1234 because I have provided these validations in Login Servet.
Now It will Invoke Login Servlet and if username and password is correct then it will forward the request to Successjsp
In the case of Wrong credentials, it will include the output of login servlet and forward the request to home.jsp
Thanks
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