Use of Java beans

My ques is a very basic one.
What is the use of beans in JSP.
If I make a form in html and submit it to a jsp page where I receive it  using

request.getParameter("var1");

and insert it into the database.
The other method is to send it to a bean using
      <jsp:setProperty name="TheBean" property="*" />

Which method is better and why.
The same thing i'd like to know when retreiving data.
I retreive the data in jsp page and display it in HTML table

<TD><%=rs.getString("col1")%></TD>

The second method could be to retreive the data in the bean and concatenate it to a variable

      showData=showData+"<td>";
            showData=showData+col1;
            showData=showData+"</td>";
And then fetch the variable in the JSP page and print it there.
Which method of the 2 is better. Moreover when I use the method of beans to retreive data it makes the application very slow. What could be the reason for that?
Kindly Suggest
          
linda22Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

KuldeepchaturvediCommented:
Well Beans are something by which you achieve data encapsulation.... in this you do not meddle with your data directly but rather ask bean methods to do it for you..
One apparent benefit is encapsulation..
next is that you put your own Ifs and buts inside beans.... like your database needs some string have to be 20 bytes... so now you bean can pad your data up for your requirements...

This list can go on but I suggest you to go to Java site and have a look at..
http://java.sun.com/products/javabeans/
0
rrzCommented:
>makes the application very slow. What could be the reason for that?
Maybe because of the String class.  
>     showData=showData+"<td>";
            showData=showData+col1;
            showData=showData+"</td>";
Did you try it with StringBuffer class ?
0
kokchoon78Commented:
>> The second method could be to retreive the data in the bean and concatenate it to a variable

Normally, i will use the second method - retreive the data in the bean and send the bean to the form as request.

for example, in your action class ( which you call database methods) :

...
...
//get database connection ..
//define prepared statement ...
...

ResultSet rs = pstmt.executeQuery();

TheBean theBean = new TheBean();
theBean.setName( rs.getString(1) );
...
...

//add this bean to your request
request.setAttribute("MYBEAN", theBean);

//forward to your jsp for displaying purposes.


In your display jsp, just get the bean from the request :

<%
   TheBean theBean = (TheBean)request.getAttribute("MYBEAN");
%>
...
...
<html>
..

<td><%=theBean.getName()%></td>

..
</html>


opps! write too long, sorry if i am not answering your question :)

cheers,







0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Cloud Class® Course: SQL Server Core 2016

This course will introduce you to SQL Server Core 2016, as well as teach you about SSMS, data tools, installation, server configuration, using Management Studio, and writing and executing queries.

linda22Author Commented:
Thanks everyone for  suggestions.
Another thing i want to know. What sort of code should be placed in the JSP page?
Should it be only calls to methods in java beans and some HTML or something else?
Can there be any situation when make making a connection and performimg DML or select operations be done in the JSP page or they should always be done in the bean.
0
linda22Author Commented:
Points increased to 240 from 190
0
kokchoon78Commented:
>>What sort of code should be placed in the JSP page?
Normally, i will put iteration or looping code in the JSP, for example :

<%
   for( int i = 0 ; i < thisList.size(); i ++ )
   {
%>
<html tag>
<%
  }
%>

>>Can there be any situation when make making a connection and performimg DML or select operations be done in the JSP page or they should always be done in the bean.

Basically, In MVC model, JSP page plays the Viewer role, and the logic should be seperated in the java beans.
0
linda22Author Commented:
Thank You so much
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
JSP

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.