Question

Passing beans from jsp to servlet

Asked by: isarasoo

hi all,

i want to know if the following is possible  if yes please  give me a small example.

I have :
servlet:"RequestHandler"
JSP:"Form.jsp" some text fields and a submit button
class: formBean

using the text areas in the form i would like to populate the bean and when the submit button is clicked the RequestHandler will just get the  bean and  do stuff with it.

im using tomcat 6.0
method= post
RequestHandler is the servlet

Secondly if you can direct me to a good resource , so i can get a good underastanding of jsp and servlets

thanks in advance for any help

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Asked On
2009-08-25 at 05:53:32ID24679603
Tags

jsp

,

servlet

,

javabeans

,

java

Topics

Java Server Pages (JSP)

,

Java Servlets

,

Java Standard Tag Library (JSTL) & Server Tags

Participating Experts
2
Points
500
Comments
25

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Answers

 

by: mwvisa1Posted on 2009-08-25 at 07:41:17ID: 25178071

Yes it is possible.  You would basically scope you JavaBean to be a higher scope than page, like say session scope.  Application scope would probably not be appropriate for user form submission IMHO.

<jsp:useBean id="formBean" scope="session" class="your.package.of.beans.FormBean" />
Syntax ref.: http://java.sun.com/products/jsp/tags/11/syntaxref11.fm14.html

<form action="/RequestHandler" method="post">
<input type="text" size="10" name="id" />
<jsp:setProperty name="formBean" property="id" param="id"/>
</form>

When submitted, the Servlet reads the bean from session.

Here is a good reference on Model View Controller (MVC) design pattern:
http://java.sun.com/developer/technicalArticles/javaserverpages/servlets_jsp/

Example of utilizing Servlet / JSP / JavaBean :
(Believe this is going the other way, so it finishes off MVC thought by getting the final results to View)
http://www.stardeveloper.com/articles/display.html?article=2001060501&page=1

Hope that helps.


--isa

 

by: rrz@871311Posted on 2009-08-25 at 07:55:31ID: 25178232

 

by: mwvisa1Posted on 2009-08-25 at 08:01:16ID: 25178299

And actually the java-samples link is the one I meant to post on example of passing bean from Servlet (Controller) to View.  Not sure what the stardeveloper link covered as can't bring it up again.  Must have been copy and paste error.  Thanks, rrz@871311.

 

by: mwvisa1Posted on 2009-08-25 at 08:03:08ID: 25178315

Ok, got it, the stardeveloper link was supposed to go under resources for MVC entitled "Combining Servlets, JSP, and JavaBeans".

 

by: isarasooPosted on 2009-08-25 at 08:22:45ID: 25178541

I have come accross the following lin of code to set the bean properties
<jsp:setProperty name="FormBean" property="*" />

im told that it will take the input datafrom  the request and sets the relevant property in the bean, providing the names are the same.

however im not sure wher tio put this lline i.e. inside the form or outside the fiorm

 

by: mwvisa1Posted on 2009-08-25 at 08:24:56ID: 25178567

I believe that goes inside the HTML <form></form> tags.

 

by: isarasooPosted on 2009-08-25 at 09:25:52ID: 25179283

ok, I cant get it too work, i have attached a snippet.  the formbean is just not populating 

<jsp:useBean id="FormBean" scope="session"
	class="com.blag.ServletController.FormBean" />
 
<form action="RegistrationServlet" onsubmit="return validate(this)"
	method="post">
 
<table id="table">
 
 
	<tr>
		<td align="right">First Name:<i>(Max 15 chars)</i></td>
		<td align="left"><input type="text" name="firstName"
			value="${param.firstName}" size="30" maxlength="15" /> 
			<jsp:setProperty name="FormBean" property="firstName" param="firstName" />
			</td>
	</tr>

                                              
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by: mwvisa1Posted on 2009-08-25 at 11:05:59ID: 25180383

I will test this out when back at work tonight as I don't have Eclipse on this machine.

 

by: isarasooPosted on 2009-08-25 at 14:36:29ID: 25182536

thanks,  i have debuugged it using eclipse and am certain that the bean is not populating..

 

by: rrz@871311Posted on 2009-08-25 at 18:41:27ID: 25183841

>the formbean is just not populating  
Let's take it one step at a time. Let's just have the JSP submit to itself. Please try the sample code below.
Please try to get that to work. If you want to add a servlet later, then we can add it.

package rrz;
public class FormBean {
   private String firstName;
   public void setFirstName(String firstName) {
                                  this.firstName = firstName;
   }
   public String getFirstName() {
                         return firstName;
   }
}
..........................................................................................
<jsp:useBean id="formBean" scope="session"
        class="rrz.FormBean" />
<jsp:setProperty name="formBean" property="firstName" />
<html>
<body>
<form method="post">
<table id="table">
        <tr>
                <td align="right">First Name:<i>(Max 15 chars)</i></td>
                <td align="left"><input type="text" name="firstName"
                        value="${param.firstName}" size="30" maxlength="15" /> 
                        </td>
        </tr>
</table>
</form>
Name is ${formBean.firstName}
</body>
</html>

                                              
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by: isarasooPosted on 2009-08-26 at 01:38:02ID: 25185397

Ok,  i have tried that code and it works. i.e it updates the bean.  however when i start adding other attributes i.e. surname  it doesnt workplease see snippet below:

Please tell me what i am doing wrong


package com.mypack.FormBeans;
public class formbean
{	
	private String firstName;
	private String surName;	
	public String getFirstName()
	{
		return firstName;
	}	
	public void setFirstName(String firstName)
	{
		this.firstName = firstName;
	}
	public String getSurName()
	{
		return surName;
	}	
	public void setSurName(String surName)
	{
		this.surName = surName;
	}
}
 
 
 
-----------------------------------------------------------------------
<jsp:useBean id="formBean" scope="session"
        class="com.mypack.FormBeans.formbean" />
<jsp:setProperty name="formBean" property="*" />
<html>
<body>
<form method="post">
<table id="table">
        <tr>
                <td align="right">First Name:<i>(Max 15 chars)</i></td>
                <td align="left"><input type="text" name="firstName"
                        value="${param.firstName}" size="30" maxlength="15" /> 
                        </td>
        </tr>
        
        <tr>
                <td align="right">SurName:<i>(Max 15 chars)</i></td>
                <td align="left"><input type="text" name="surName"
                        value="${param.surName}" size="30" maxlength="15" /> 
                        </td>
        </tr>
        
        
</table>
</form>
firstName is ${formBean.firstName}
<br/>
surName is ${formBean.surName}
</body>
</html>

                                              
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by: isarasooPosted on 2009-08-26 at 01:48:20ID: 25185455

My bad i forgot to add the submit button that works,  now i need to send the bean to a servlet

 

by: isarasooPosted on 2009-08-26 at 02:24:22ID: 25185631

Hi  i just realised that the bean populates, but im not getting the data properly in the do post method.  Please see the snippet below that i have taken out of my doPost() method.

the form  submits to the ervlet controller and these are the first lines in my doPost method()

      

HttpSession session = request.getSession();
		FormBean data = (FormBean) session.getAttribute("formBean");
 
String first = data.getFirstName();//this is null

                                              
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by: mwvisa1Posted on 2009-08-26 at 02:36:19ID: 25185693

The more I think about this, I think I have only ever gone the other way from Servlet to JSP.  Should be possible the way you have it though.  See if maybe the session is being invalidated somehow -- might be the JavaBean is filling just fine but you are losing your session.

HttpSession session = request.getSession(false);
String first;
 
if (session != null) {
   FormBean data = (FormBean) session.getAttribute("formBean");
   first = data.getFirstName();
} else {
   first = "null session!";
}

                                              
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by: isarasooPosted on 2009-08-26 at 03:04:31ID: 25185861

ok then for some reason when i debug it the debugger skips the following code completely

if (session != null) {
   FormBean data = (FormBean) session.getAttribute("formBean");
   first = data.getFirstName();
} else {
   first = "null session!";
}

                                              
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by: isarasooPosted on 2009-08-26 at 08:41:45ID: 25188929

Ok the only way i can get it too work is by sending the been to another jsp page to populate the bean and then forward the bean request to the servlet.  Please let me know if there is any way to do it withing the form.jsp.

thanks

 

by: rrz@871311Posted on 2009-08-26 at 09:30:42ID: 25189566

>the form  submits to the ervlet controller  
Please show us the action attribute of your form  and the also show us how you mapped your servlet in your web.xml file.  

 

by: rrz@871311Posted on 2009-08-26 at 09:39:12ID: 25189643

If you post all your code, then we could debug it on our side.

 

by: isarasooPosted on 2009-08-26 at 11:14:22ID: 25190548

Hi  thaks for your reply, please find attached a the code,  I havent attached the actual code im working with but have managed to emulatge the problem i am having.

please disregard the process.jsp as that i believe is a poor technique

thanks in advance for any help

 

by: rrz@871311Posted on 2009-08-27 at 09:12:13ID: 25199859

Did you have any success ?

 

by: isarasooPosted on 2009-08-27 at 10:40:35ID: 25200802

no i posted my cde as requested.

 

by: mwvisa1Posted on 2009-08-27 at 10:59:07ID: 25200957

@isarasoo: Please note that http:#25190548 doesn't contain any code attachment.

 

by: isarasooPosted on 2009-08-27 at 11:29:11ID: 25201194

hi i just realised it doesnt attach zip files

 

by: mwvisa1Posted on 2009-08-27 at 16:10:46ID: 25203475

Zip should be valid file extension, but think it does some smart checking of what is inside the zip, so you may have to change your code files to have .txt extension then zip those up then attach. ;)

 

by: isarasooPosted on 2009-09-28 at 05:16:56ID: 31620124

works fine

20120131-EE-VQP-002

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