get:property

Watch “JSP Part-10 Implicit Object, Scope of JSP Variables” on YouTube

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#Java #JSP #ImplicitObjectsinJSP #ScopeofJSPVariables #jsp:useBean #RaviROza

There are 9 jsp implicit objects.

These objects are created by the web container  that are available to all the jsp pages.

some commonly used objects for servlets that JSP page developers might need to use are:

  • request
  • response
  • out
  • session
  • application
  • config
  • pageContext
  • page
  • exception

Scope of jsp varibles

  • application
  • session
  • request
  • page

How to deal with exception in JSP by:

  • using page directive
  • using deployment descriptor (web.xml) file

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

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Watch “JSP Part-9 | Use Bean Example-3 (Gujarati)” on YouTube

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#Java #JSP #jsp:useBean #RaviROza

jsp:use bean tag is used to declare and used object using tag format in jsp page.

Bean object is declared using use:bean tag in jsp page. set:property tag is used to set the values and get:property tag used to get the values from bean object.

Scope for jsp:bean is set to request so that when a request is transfer to another page its also accessible there.

following is the list of important attributes of jsp:usebean tag
➡ id (name of the object)
➡ name (name of the fully qualified class name of bean)
➡ scope (application,request,session and page), default is page.

In this example bean values are set in process.jsp and then its transferred to welcome.jsp using request dispatcher. Welcome.jsp access the values get the values which were set in process.jsp page.

Summary of files used in this example
➡️ index.jsp (to accept client input)
➡️ process.jsp (to declare and set the values in bean)
➡️ UserBean.java (user bean POJO file)
➡️ welcome.jsp (welcome page to display)

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 Static Login using Bean</title>
</head>
<body>

<form action="process.jsp">

Username : <input type="text" name="txtUser">
Password :  <input type="password" name="txtPass">
<input type="submit">
</form>

</body>
</html>

process.jsp

<%@page import="com.raviroza.beans.UserBean"%>
<%@ 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 : Using Beans</title>
</head>
<body>

<jsp:useBean id="hjd" class="com.raviroza.beans.UserBean" scope="request">
</jsp:useBean>

<jsp:setProperty 
property="username" name="hjd" 	value='<%=request.getParameter("txtUser") %>'/>
	
<jsp:setProperty 	
property="password" name="hjd"	value='<%=request.getParameter("txtPass") %>' />
	
<%
	RequestDispatcher rd = request.getRequestDispatcher("welcome.jsp");
 	rd.forward(request, response);
%>
</body>
</html>

UserBean.java

package com.raviroza.beans;

public class UserBean implements java.io.Serializable 
{
	private String username,password;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}	
	public boolean validate()
	{
		if(username.equals("admin") && password.equals("admin"))
		{
			return true;
		}
		else 
		{
			return false;
		}
	}
}

welcome.jsp

<%@page import="com.raviroza.beans.UserBean"%>
<%@ 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>Welcome</title>
</head>
<body>
<h1>Welcome Page</h1>

<jsp:useBean id="hjd" class="com.raviroza.beans.UserBean" scope="request">
</jsp:useBean>

Hello,
<p>User name : <jsp:getProperty property="username" name="hjd"/>

<p>Password : <jsp:getProperty property="password" name="hjd"/>

</body>
</html>

Output

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

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https://raviroza.blogspot.com/
https://www.facebook.com/ravi.oza.it
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Watch “JSP Part-8 | Use Bean Example-2 (Gujarati)” on YouTube

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#Java #JSP #jsp:useBean #RaviROza

It contains the following files
👉 Index.jsp
👉 load.jsp
👉 StudentBean.java
👉 welcome.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>use Bean Example</title>
</head>
<body>

<form action="load.jsp">
	<p>Enter Student No
	<input type="text" name="t1">
	<p>Enter Student Name
	<input type="text" name="t2">	
	<p>
	<input type="submit">
</form>
</body>
</html>

load.jsp

<%@page import="raviroza.StudentBean"%>
<%@ 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">
</head>
<body>
	<%
		int 	 id  = Integer.parseInt(request.getParameter("t1"));
		String name = request.getParameter("t2");
		
 		StudentBean st1 = new StudentBean();
 		st1.setSid(id);
 		st1.setSname(name);
		
// 		request.setAttribute("p1", id);
// 		request.setAttribute("p2", name);
		
// 		out.println("<p>"+st1.getSid());
// 		out.println("<p>"+st1.getSname());
		
		request.setAttribute("st1", st1);
		
		RequestDispatcher rd = request.getRequestDispatcher("welcome.jsp");
		rd.forward(request, response);
		//response.sendRedirect("welcome.jsp");		
	%>	
</body>
</html>

StudentBean.java

package raviroza;

public class StudentBean implements java.io.Serializable 
{
	private int Sid;
	private String Sname;
	
	public int getSid() {
		return Sid;
	}
	public void setSid(int sid) {
		Sid = sid;
	}
	
	public String getSname() {
		return Sname;
	}
	public void setSname(String sname) {
		Sname = sname;
	}			
}

welcome.jsp

<%@page import="raviroza.StudentBean"%>
<%@ 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>welcome</title>
</head>
<body>
<h1> Welcome to the home page</h1>
<%
	StudentBean st = new StudentBean();
	st = (StudentBean) request.getAttribute("st1");
	
	out.println(st.getSid());
	out.println(st.getSname());
%>

<%-- <%=request.getAttribute("p1").toString() %> --%>
<%-- <%=request.getAttribute("p2").toString() %> --%>
</body>
</html>

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

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https://raviroza.blogspot.com/
https://www.facebook.com/ravi.oza.it
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Watch “JSP Part-7 | Use Bean Example-1 (Gujarati)” on YouTube

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#Java #JSP #jsp:useBean #RaviROza

✔️ jsp:useBean standard action tag is use to establish a connection between a jsp page and a java bean.
✔️ In web applications of java, jsp and java bean communication is required in the following two cases: 1️⃣In a real-time MVC project, a model class (business class) will set the data to a java bean and a jsp (view) will read the data from a bean and finally displays it on the browser. 2️⃣If multiple jsp pages need common java logic then it separates that java code into a bean and then we call the bean from jsp.

Video features the following:
👉 How to define Bean class in java
👉 How to use bean class in JSP scriplet
👉 How to use bean using jsp:useBean

It contains the following files
👉 Index.jsp 👉 process.jsp 👉 UserBean.java

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 Static Login using Bean</title>
</head>
<body>

<form action="process.jsp">

Username : <input type="text" name="txtUser">
Password :  <input type="password" name="txtPass">
<input type="submit">
</form>

</body>
</html>

process.jsp

<%@page import="com.raviroza.beans.UserBean"%>
<%@ 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 : Using Beans</title>
</head>
<body>
<p>Using JSP:useBean tag
<%
// 	String u = request.getParameter("txtUser");
// 	String p = request.getParameter("txtPass");
	
// 	UserBean user = new UserBean();
// 	user.setUsername(u);
// 	user.setPassword(p);
	%>
<jsp:useBean id="userobj" class="com.raviroza.beans.UserBean"/>
	
<jsp:setProperty property="username" name="userobj" value="ravi r oza"/>
<jsp:setProperty property="password" name="userobj" value="my password"/>

<h2>using get property</h2>
<jsp:getProperty property="username" name="userobj"/>

</body>
</html>

UserBean.java

package com.raviroza.beans;

public class UserBean implements java.io.Serializable 
{
	private String username,password;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}	
	public boolean validate()
	{
		if(username.equals("admin") && password.equals("admin"))
		{
			return true;
		}
		else 
		{
			return false;
		}
	}
}

OS : Windows 10
Jdk : Version 8
IDE : Eclipse Mars
Server : Apache Tomcat 7

Follow me @
https://raviroza.wordpress.com/
https://raviroza.blogspot.com/
https://www.facebook.com/ravi.oza.it
https://twitter.com/raviozaIT

Subscribe my channel to get latest video notification https://www.youtube.com/user/ravioza101