How can we use beans in JSP?

oxygen · #1 (**permalink**) 07-26-2007, 03:25 AM

kingmaker · #2 (**permalink**) 07-26-2007, 03:41 AM

JSP provides three tags to work with beans:-

<jsp:useBean id=“bean name” class=“bean class” scope = “page | request | session|application ”/>
Bean name = the name that refers to the bean.
Bean class = name of the java class that defines the bean.
<jsp:setProperty name = “id” property = “someProperty” value = “someValue” />
id = the name of the bean as specified in the useBean tag.
property = name of the property to be passed to the bean.
value = value of that particular property .
<jsp:getProperty name = “id” property = “someProperty” />
Here the property is the name of the property whose value is to be obtained from thebean.Below is a code snippet which shows how MyUserClass is used and the valuesaccessed.

<jsp:useBean id="user" class="MyUserClass" scope="session"/>
<HTML>
<BODY>You entered
<BR>Name: <%= user.getUsername() %><BR>Email:
<%= user.getEmail() %><BR></BODY></HTML>

leoraja8 · #3 (**permalink**) 08-09-2007, 06:54 AM

Jsp provides as approach to utilizing javabeans that is based on the concept of tags. These are really no more complicated than
the standard html tags; they have a name and they take attributes.
There are three tags provided by the specification to support the use of javabeans in your jsp pages:
1. <jsp:usebean>
2.<jsp:setproperty>
3.<jsp:getproperty>.

Example : Javabean class.

import java.io.Serializable;
public class CarBean implements Serializable
{
private String make = "Ford";
public CarBean()
{}
public String getMake()
{
return make;
}

public void setMake(String make)
{
this.make = make;
}

}

Jsp page:
<html>
<head> <title> Using a bean</title> </head>
<body>
<jsp:usebean id = "MyCar: Class = "CarBean"/>
I have a <jsp:getproperty name = "MyCar" property = "make" />
<jsp:setproperty name = "MyCar" property = "make" value = "Ferrari" />
Now I have a <jsp:getproperty name = "MyCar" property = "make" />
</body>
</html>

output:
--------------
Using a bean

i have a Ford
Now i have a Ferrari

saravanan · #4 (**permalink**) 03-19-2008, 05:33 AM

In jsp eacy to use java beans.

now i just explained a JSP exaple that uses a Java Beans for login

steps.

1. Create a login.html page

2. Create a loginaction.jsp page

3. create a login.java page

login.html
---------

<html>
<head>
<title>Login Page</title>
</head>
<body>
<form action="loginaction.jsp" method="post">
<table width="38%" border="1">
<tr>
<td width="38%">User Name</td>
<td width="62%"><input name="uname" type="text" id="uname"></td>
</tr>
<tr>
<td>Password</td>
<td><input name="pass" type="text" id="pass"></td>
</tr>
<tr>
<td><input type="submit" name="Submit" value="Submit"></td>
<td> </td>
</tr>
</table>
</form>
</body>
</html>

login.java
Rule
----
ompile this file and copy the class file to
WEB-INF/classes/your_package_name/your_class_file

in our example
------------
WEB-INF/classes/login/Login.class

package login;
// Java Document
public class Login
{
/*
BEAN PROPERTIES
These values must match with
login.html form text fields names
*/
private String uname;
private String pass;
public Login()
{

}
/*
Now write setter and getter method
just add set or get before the BEAN PROPERTIES
*/
public void setUname(String uname)
{
this.uname=uname;
}
public String getUname()
{
return uname;
}

public void setPass(String pass)
{
this.pass=pass;
}
public String getPass()
{
return pass;
}
public boolean validate()
{
if((uname.equals("kamal") && (pass.equals("kannan"))
{
return true;
}
else
{
return false;
}
}

}

loginaction.jsp
--------------
<%@ page contentType="text/html; charset=" language="java" import="java.sql.*" errorPage="" %>
<%@page import="login.Login"%>
<jsp:useBean id="login" scope="request" type="login.Login"/>
<%-- This is a comment --%>
<%-- Sets all form values to the BEAN PROPERTY --%>
<%-- This only works if your BEAN PROPERTY names and FORm NAMES are mactch --%>
<jsp:setProperty property="*"/>

<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<%
if(login.validate())
{
Welcome !
%>
<jsp:getProperty property="uname"/>
<%
}
else
{
out.print("Invalid User");
}
%>
</body>
</html>

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