Array as session attribute

[Surendra Kumar]

Hi,

I have a servlet where I am getting an array of param values, and putting this array in an session attribute.
Later in another servlet, I'm getting this attribute as an array, but I am getting single value with comma seperated values.

what might be the problem?
Isn't array returned? Why is it returened as single value?

[Christophe Verré]

putting this array in an session attribute.

Are you sure this is not a comma separated string that you put in you session ? Please show us how you first get the array, how you put it in session, and how you get it back.

[Bear Bibeault]

As Satou pointed out, nothing will change anything that you store as a scoped variable.

[Surendra Kumar]

This is how I did:
1st servlet:

    
String[] idList = request.getParamterValues("id");
session.setAttribute("idList", idList);
request.getRequestDispatcher(url).forward(req,res);

2nd servlet:

 
String[] idList = session.getAttribute("idList");
Call other methods from doPost()...
request.getRequestDispatcher(url).forward(req,res);

In this 2nd servlet, I got idList as a single String with id's separated by commas.

[Ben Souther]

Can you also post the HTML form that you're using to send the data from the browser to your servlet?

[Ben Souther]

Also, how are you printing idList (how do you know that it's IDs separated with commas)?

[Ben Souther]

Originally posted by Surendra Nichenametla:

In this 2nd servlet, I got idList as a single String with id's separated by commas.

Are they being printed inside square brackets?
[one, two, three]

[Christophe Verré]

Are they being printed inside square brackets?

[Ben Souther]

Originally posted by Satou kurinosuke:

It wasn't really meant as a joke.
I don't know what server the Original Poster (OP) is using or how he's printing the array.

I know that the toString method in java.util.Arrays, for Java 5 will actually print out the contents of the array instead of the traditional
[Ljava.lang.String;@10b62c9 that we're all used to:

 
      1 import java.util.Arrays;
      2 public class Junk{
      3     public static void main(String[] args){
      4         String[] nums = new String[]{"one", "two", "three"};
      5         System.out.println("NUMS: " + Arrays.toString(nums));
      6     }
      7 }

I'm just wondering if he really is dealing with a single string or if whatever he's using to print the array is using Arrays.toString.

[Surendra Kumar]

This is how the request params are going in the url:

&VID=0%2C0&id=115956289325355100007%2C115956289325355100009

[Christophe Verré]

I'm just wondering if he really is dealing with a single string or if whatever he's using to print the array is using Arrays.toString.

I understood what you meant, that's why I put a smile. No offense of course.

[Ben Souther]

&VID=0%2C0&id=115956289325355100007%2C115956289325355100009
This would not be interpreted by a servlet as an array.
It's a URL encoded set of numeric characters with a comma in the middle.

For an array, of ids, you would need to send:
&VID=0%2C0&id=115956289325355100007&id=115956289325355100009
[ October 04, 2006: Message edited by: Ben Souther ]

[Surendra Kumar]

Then, how to get parameter value that contain multiple values of same parameter, and set in session?

[Ben Souther]

Sorry, updated post while you were responding.

Here:
For an array, of ids, you would need to send:
&VID=0%2C0&id=115956289325355100007&id=115956289325355100009

[Ben Souther]

Originally posted by Satou kurinosuke:

I understood what you meant, that's why I put a smile. No offense of course.

Ahh, I should have known.