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bean and jstl question

nirali shah
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Joined: Apr 16, 2009
Posts: 24
This question has been edited for easier reading.
following code I have taken from an example


<jsp:useBean id="bean1" class="ourbeans.player" > <jsp:setProperty name="bean1" property="*" /> </jsp:useBean>

we are using bean instead of putting logic in the jsp page.

But, we should first create the 'player ' bean with all the attributes and getter & setter methods, as shown.



// player.java package ourbeans; public class player{ String name; String place; String game; public player(){ name=" "; place=" "; game=" "; } public void setName(String a){ name=a; } public void setPlace(String b){ place=b; } public void setGame(String c){ game=c; }

How is the values of parameters a, b and c is passed to the setName(String a), setPlace(String b) and setGame(String c) from the form without {param.text} ? If the values are passed from the form using {param.text} , then why not use that directly in the jsp page rathet than calling it through bean ? What is the use of bean in such a situation ?



public String getName(){ return name; } public String getPlace(){ return place; } public String getGame(){ return game; } }

Whats the need of getter methods, when all the variables are public and can be called directly ?

In this demo2.jsp, we collect the data and then display the data entered by the user. Question is, how is data sent to the bean from the form ?

Note that instead of {param.text1}, we are using {bean1.name}. We should carefully name the html form controls with the corresponding attribute names given in the bean. We cannot name the controls as 'text1' etc, now! Question is, we can use {bean1.name} in the jsp page and collect data from bean1 in the jsp page. But how does bean1 get parameters from the form ?



why use ${bean1.name} ? We can directly get parameters from form as ${param.text} ? Whats the point in using bean in this situation ?


thanks


Seetharaman Venkatasamy
Ranch Hand

Joined: Jan 28, 2008
Posts: 5575

nirali shah wrote:
Whats the point in using bean ?

to Avoid the scriptlet in jsp.I guess nowadays useBean itself consider as bad practise

nirali shah wrote:
In the class player, all the variables are declared as public. In that case why do we need getter methods ?


I guess , useBean implementation is based on setter and getter of Bean
Bear Bibeault
Author and ninkuma
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  67

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Bear Bibeault
Author and ninkuma
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Joined: Jan 10, 2002
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  67

seetharaman venkatasamy wrote:
nirali shah wrote:
Whats the point in using bean ?
I guess nowadays useBean itself consider as bad practise

Not correct in general. As useBean creates a scoped variable, it is still viable for use with the JSTL and EL.

Using it for this purpose, however -- gathering request params in a JSP rather than in a servlet controller -- is rather dated and not best practice.
 
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