How to use session in JSP pages to get information

Question

I have a JSP page used for editing some user s info  When a user logins to the website  I keep the information in the session  then in my edit page I try the following    lt    String username session getAttribute  username      gt   lt form action  editinfo  method  post  gt       lt table gt           lt tr gt               lt td gt Username   lt  td gt  lt td gt   lt input type  text  value   lt   username   gt     gt   lt  td gt           lt  tr gt       lt  table gt   lt  form gt    but it gives error saying session cannot be resolved  What can I do about it

User · Answer

lt    String username  String session getAttribute  username      gt  form action  editinfo  method  post  gt        lt table gt           lt tr gt               lt td gt Username   lt  td gt  lt td gt   lt input type  text  value   lt   username   gt     gt   lt  td gt           lt  tr gt        lt  table gt    add  lt    String username  String session getAttribute  username      gt

User · Answer

Suppose you want to use  say ID in any other webpage then you can do it by following code snippet    String id  String session getAttribute  uid      Here uid is the attribute in which you have stored the ID earlier  You can set it by   session setAttribute  uid  id

User · Answer

Use   lt   String username    String request getSession   getAttribute         gt    Note that your use of  lt          gt  is translated to class-level  but request is only available in the service   method of the translated servlet   See how JSP code is translated to a servlet

User · Answer

The reason why you are getting the compilation error is  you are trying to access the session in declaration block   lt      gt   where it is not available  All the implicit objects of jsp are available in service method only  Code of declarative blocks goes outside the service method   I d advice you to use EL  It is a simplified approach     sessionScope username  would give you the desired output

User · Answer

JSP implicit objects likes session  request etc  are not available inside JSP declaration  lt      gt  tags   You could use it directly in your expression as   lt td gt Username   lt  td gt   lt td gt  lt input type  text  value   lt    session getAttribute  username     gt     gt  lt  td gt    On other note  using scriptlets in JSP has been long deprecated  Use of EL  expression language  and JSTL tags is highly recommended  For example  here you could use EL as   lt td gt Username   lt  td gt   lt td gt  lt input type  text  value    username     gt  lt  td gt    The best part is that scope resolution is done automatically  So  here username could come from page  or request  or session  or application scopes in that order  If for a particular instance you need to override this because of a name collision you can explicitly specify the scope as   lt td gt  lt input type  text  value    requestScope username     gt  lt  td gt  or   lt td gt  lt input type  text  value    sessionScope username     gt  lt  td gt  or   lt td gt  lt input type  text  value    applicationScope username     gt  lt  td gt

User · Answer

You can directly use  String session getAttribute  username    inside scriptlet tag ie  lt

User · Answer

x000D   x000D  form action  editinfo  method  post  gt  x000D   lt table gt  x000D     lt tr gt  x000D       lt td gt Username  lt  td gt  x000D       lt td gt  x000D         lt input type  text  value   lt  if  request getSession   getAttribute   parameter whatever you passed       null x000D    x000D  request getSession   getAttribute  parameter whatever you passed    toString    x000D    x000D     gt     gt  x000D       lt  td gt  x000D     lt  tr gt  x000D   lt  table gt  x000D   lt  form gt  x000D   x000D   x000D

[java] How to use session in JSP pages to get information?

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