Include another JSP file

Question

I am currently trying to learn JSP  My question is  at present I used to include the header and footer of the page using    lt   include file  includes header jsp    gt    and    lt   include file  includes footer jsp    gt    But now  I have separated the page content also  So  if user clicks on a page  say products  it has to load the JSP file which is situated in  includes pages products jsp So  the link to the user is like   lt a href  index jsp p products  gt Products lt  a gt    So  I have to get the p value and display the page based on it   Following is what I have done so far    lt    if request getParameter  p    null         String p   request getParameter  p      gt        lt   include file  includes page name jsp    gt    lt         gt    So  how do I place the value of variable  p  in position of  page name     Or  is there any other method that I could use    In PHP  we could use the include   or include once    I am bit stuck in this JSP

User · Accepted Answer

What you re doing is a static include  A static include is resolved at compile time  and may thus not use a parameter value  which is only known at execution time   What you need is a dynamic include    lt jsp include page         gt    Note that you should use the JSP EL rather than scriptlets  It also seems that you re implementing a central controller with index jsp  You should use a servlet to do that instead  and dispatch to the appropriate JSP from this servlet  Or better  use an existing MVC framework like Stripes or Spring MVC

User · Answer

You can use Include Directives   lt    if request getParameter  p    null         String p   request getParameter  p      gt        lt   include file   lt    includes     p    jsp   gt    gt    lt         gt    or JSP Include Action   lt    if request getParameter  p    null         String p   request getParameter  p      gt        lt jsp include page   lt    includes   p   jsp   gt    gt    lt         gt    the different is include directive includes a file during the translation phase  while JSP Include Action includes a file at the time the page is requested  I recommend Spring MVC Framework as your controller to manipulate things  use url pattern instead of parameter   example   www yourwebsite com products   instead of  www yourwebsite com  p products   Watch this video Spring MVC Framework

User · Answer

At page translation time  the content of the file given in the include directive is    pasted    as it is  in the place where the JSP include directive is used  Then the source JSP page is converted into a java servlet class  The included file can be a static resource or a JSP page  Generally  JSP include directive is used to include header banners and footers    Syntax for include a jsp file    lt    include file  relative url  gt    Example   lt   include file  page name jsp    gt

User · Answer

1  lt a href  index jsp p products  gt Products lt  a gt  when user clicks on Products link you can directly call products jsp   I mean u can maintain name of the JSP file same as parameter Value    lt    if request getParameter  p    null         String contextPath  includes       String p   request getParameter  p       p p   jsp      p contextPath p     gt        lt   include file   lt   p  gt     gt    lt         gt    or  2 you can maintain external resource file with key value pairs  like below  products    products jsp  customer    customers jsp  you can programatically retrieve the name of JSP file from properies file   this way you can easily change the name of JSP file

User · Answer

You can use parameters like that   lt jsp include page  about jsp  gt       lt jsp param name  articleId  value     gt   lt  jsp include gt    and  in about jsp you can take the paramter    lt  String leftAds   request getParameter  articleId     gt

User · Answer

For a reason I don t yet understand  after I used  lt   include file  includes footer jsp    gt  in my index jsp then in the other jsp files like register jsp I had to use  lt    include file  footer jsp   gt   As you see there was no more need to use full path  STS had store my initial path

[jsp] Include another JSP file

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