passing variables in response.sendRedirect

[Bernard Sigmund Gustav]

I need to redirect my users to a page while at the same time passing one variable.

but response.sendRedirect needs a hardcoded value to pass and can't pass a dynamic one.

what it currently does is:
response.sendRedirect("sample.jsp?temp=1");

now, instead of the value "1", i want to pass a variable

[Peter Sin]

Originally posted by Shuini Gustav:
I need to redirect my users to a page while at the same time passing one variable.

but response.sendRedirect needs a hardcoded value to pass and can't pass a dynamic one.

what it currently does is:
response.sendRedirect("sample.jsp?temp=1");

now, instead of the value "1", i want to pass a variable

1) create strTemp variable
2) assign "1" to strTemp
3) rewrite response.sendRedirect(??? + ???)

Explore by yourself.

[Christophe Verré]

You don't want to use forward() ?

[Bernard Sigmund Gustav]

i tried assigning a value to a variable and passing the variable in response.sendRedirect. it doesn't work. someone told me it needed a hard coded value to be able to pass something, and not a variable.

i didn't know variables can be passed in forward....
how is that done?

[Christophe Verré]

If you forward the request, you can use setAttribute to put your variable in the request scope, which can easily be retrieved in your JSP.

request.setAttribute("temp", yourVar);
RequestDispatcher dispatcher = request.getRequestDispatcher("/sample.jsp");
dispatcher.forward( request, response );

[ak pillai]

Use a StringBuffer to dynamically append value like

StringBuffer sb = new StringBuffer("");
 
int myValue = 1;
int myValue2 = 2;
 
sb.append("sample.jsp");
sb.append("?temp=" + myValue);
sb.append("&temp2=" + myValue2);
 
 
String url = sb.toString();
 
String urlEncoded = response.encodeRedirectURL(url) ;
 
response.sendRedirect(urlEncoded)]StringBuffer sb = new StringBuffer("");
 
int myValue = 1;
int myValue2 = 2;
 
sb.append("sample.jsp");
sb.append("?temp=" + myValue);
sb.append("&temp2=" + myValue2);
 
 
[B]String url = sb.toString();
String urlEncoded = response.encodeRedirectURL(url) ;[/B]
response.sendRedirect(urlEncoded);
 

Hope this helps.
[ March 07, 2006: Message edited by: ak pillai ]

[Jherald Lacambra]

Wow long codes..

i only use this and its working fine:

String id = "123";
response.sendRedirect("toNexturl.jsp?id="+id);

[Bernard Sigmund Gustav]

Originally posted by Jherald Lacambra:
Wow long codes..

i only use this and its working fine:

String id = "123";
response.sendRedirect("toNexturl.jsp?id="+id);

this doesn't work
it outputs null

[Bernard Sigmund Gustav]

Originally posted by Satou kurinosuke:
If you forward the request, you can use setAttribute to put your variable in the request scope, which can easily be retrieved in your JSP.

request.setAttribute("temp", yourVar);
RequestDispatcher dispatcher = request.getRequestDispatcher("/sample.jsp");
dispatcher.forward( request, response );

what's the RequestDispatcher for?

[Peter Sin]

Originally posted by Shuini Gustav:


this doesn't work
it outputs null

How do you retrieve the value ?
[ March 07, 2006: Message edited by: Peter Sin ]

[Miriam van Soest]

If I am not mistaken:

- RequestDispatcher + forward: You want your server to forward the request to another page/servlet etc...
- SendRedirect: You send an answer back to the client, which will tell the browser to go to another place.

[Jherald Lacambra]

Originally posted by Shuini Gustav:


this doesn't work
it outputs null

to check this if it is working
try to see the url

of course it should be http://mywebsite.com/toNextUrl.jsp?id=theValueOfId

this working. if not then the url set maybe like this http://mywebsite.com/toNextUrl.jsp?id=

so it will get null

[Bear Bibeault]

Originally posted by Shuini Gustav:

this doesn't work
it outputs null

It will work just fine. You must be retrieving the value incorrectly.

[Bernard Sigmund Gustav]

can it also pass more than one variable?

[Jherald Lacambra]

Originally posted by Shuini Gustav:
can it also pass more than one variable?

of course it can

response.sendRedirect("urNextUrl.jsp?fisrtVar="+var1+"&secondVar="+var2);

[Bernard Sigmund Gustav]

thanks

[Bernard Sigmund Gustav]

can the response.sendRedirect be targeted to open in a new window?
if so, how's that done?

[Bear Bibeault]

No, the response cannot be targetted to a differnent window. You need to target the request to the window in which you want the response to appear.

[Bernard Sigmund Gustav]

yes. i want to target the response to a window I want it to appear in. much like the html attribute target="_blank".

how is that incorporated in response.sendRedirect?

[Bear Bibeault]

I repeat: the response cannot be targetted to a different window. You'll need to use the HTML target attribute for the original request.

[Jherald Lacambra]

if you want to do that you will have 2 windows and 2 redirects.
one will redirect a window that will open you page and then it will redirect again to the original page.

[Christophe Verré]

Doing as Bear says is easier. Setting the target in the page calling the servlet. The page making the request should deal with this.

[Bernard Sigmund Gustav]

thanks