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Difference between request parameter and request attribute

Akhilesh Murthy
Greenhorn

Joined: Oct 07, 2009
Posts: 24

Hi,

What are the key differences between request parameter and request attribute?

Thanks
Frits Walraven
Creator of Enthuware JWS+ V6
Bartender

Joined: Apr 07, 2010
Posts: 1715
    
  25

Hi,

What are the key differences between request parameter and request attribute?

Parameter:
  • Read only
  • Contains submitted data
  • Strings


  • Attribute:
  • Read/Write
  • Doesn't contain submitted data
  • Can be any Object


  • Regards,
    Frits
    Sharad Kharya
    Ranch Hand

    Joined: Oct 15, 2008
    Posts: 68
    Request Parameter are submitted with request URL and you can get thos parameter values using getParameter(String name)

    Later if you want, you can set parameters in request scope, which will be accessed in other included/forwarded servlet/JSP while using RequestDispatcher mechanism.


    java.lang.String getParameter(java.lang.String name) ----- Returns the value of a request parameter as a String, or null if the parameter does not exist.

    java.lang.Object getAttribute(java.lang.String name) ------- Returns the value of the named attribute as an Object, or null if no attribute of the given name exists.
    Frits Walraven
    Creator of Enthuware JWS+ V6
    Bartender

    Joined: Apr 07, 2010
    Posts: 1715
        
      25

    Later if you want, you can set parameters in request scope, which will be accessed in other included/forwarded servlet/JSP while using RequestDispatcher mechanism.

    Be careful here: there is no ServletRequest.setParameter() or HttpServletRequest.setParameter() method, nor is there a RequestDispatcher.addParameter() of RequestDispatcher.setParameter() method.

    What you are describing is a mechanism in a JSP where you can use the <jsp:param> in following tag:

    These additional parameters are added to the request, but only for the duration of the include or forward.

    Regards,
    Frits
     
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