How to call servlet through a JSP page

Question

I would like to call a Servlet through a JSP page  What is the method to call

User · Answer

You can submit your jsp page to servlet  For this use  lt form gt  tag   And to redirect use   response sendRedirect  servleturl

User · Answer

You can use RequestDispatcher as you usually use it in Servlet    lt    page contentType  text html   gt   lt    page import    javax servlet RequestDispatcher    gt   lt        RequestDispatcher rd   request getRequestDispatcher   yourServletUrl         request setAttribute  msg   HI Welcome         rd forward request  response     gt    Always be aware that don t commit any response before you use forward  as it will lead to IllegalStateException

User · Answer

You can either post HTML form to URL  which is mapped to servlet or insert your data in HttpServletRequest object you pass to jsp page

User · Answer

You could use  lt jsp include gt  for this   lt jsp include page  quot  servletURL quot    gt   It s however usually the other way round  You call the servlet which in turn forwards to the JSP to display the results  Create a Servlet which does something like following in doGet   method  request setAttribute  quot result quot    quot This is the result of the servlet call quot    request getRequestDispatcher  quot  WEB-INF result jsp quot   forward request  response    and in  WEB-INF result jsp  lt p gt The result is   result  lt  p gt   Now call the Servlet by the URL which matches its  lt url-pattern gt  in web xml  e g  http   example com contextname servletURL  Do note that the JSP file is explicitly placed in  WEB-INF folder  This will prevent the user from opening the JSP file individually  The user can only call the servlet in order to open the JSP file   If your actual question is  quot How to submit a form to a servlet  quot  then you just have to specify the servlet URL in the HTML form action   lt form action  quot servletURL quot  method  quot post quot  gt   Its doPost   method will then be called   See also   Servlets info page - Contains a hello world How to call servlet class from HTML form How do I pass current item to Java method by clicking a hyperlink or button in JSP page  Show JDBC ResultSet in HTML in JSP page using MVC and DAO pattern Design Patterns web based applications

User · Answer

Why would you want to do this  You shouldn t be executing controller code in the view  and most certainly shouldn t be trying to pull code inside of another servlet into the view either   Do all of your processing and refactoring of the application first  then just pass off the results to a view  Make the view as dumb as possible and you won t even run into these problems   If this kind of design is hard for you  try Freemarker or even something like Velocity  although I don t recommend it  to FORCE you to do this  You never have to do this sort of thing ever   To put it more accurately  the problem you are trying to solve is just a symptom of a greater problem - your architecture design of your servlets

User · Answer

there isn t method to call Servlet  You should make mapping in web xml and then trigger this mapping    Example  web xml      lt servlet gt       lt servlet-name gt hello lt  servlet-name gt       lt servlet-class gt test HelloServlet lt  servlet-class gt     lt  servlet gt      lt servlet-mapping gt       lt servlet-name gt hello lt  servlet-name gt       lt url-pattern gt  hello lt  url-pattern gt     lt  servlet-mapping gt    This mapping means that every call to http   yoursite yourwebapp hello trigger this servlet For example this jsp    lt jsp forward page   hello   gt

[jsp] How to call servlet through a JSP page

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