How do I call a specific Java method on a click submit event of a specific button in JSP

Question

My Java file is   public class MyClass        public void method1                    some code            public void method2               some code            public void method3               some code           In my JSP page I have three HTML buttons   If I click on button1  then only method1 will be called  if I click on button2 then only method2 will execute  and if button3  then only method3  and so on   How can I achieve this

User · Answer

lt form method  post  action  servletName  gt           lt input type  submit  id  btn1  name  btn1   gt        lt input type  submit  id  btn2  name  btn2   gt   lt  form gt      on pressing it request will go to servlet on the servlet page check which button is pressed and then accordingly call the needed method as objectName method

User · Answer

Just give the individual button elements a unique name  When pressed  the button s name is available as a request parameter the usual way like as with input elements    You only need to make sure that the button inputs have type  submit  as in  lt input type  submit  gt  and  lt button type  submit  gt  and not type  button   which only renders a  dead  button purely for onclick stuff and all   E g    lt form action    pageContext request contextPath  myservlet  method  post  gt       lt input type  submit  name  button1  value  Button 1    gt       lt input type  submit  name  button2  value  Button 2    gt       lt input type  submit  name  button3  value  Button 3    gt   lt  form gt    with   WebServlet   myservlet   public class MyServlet extends HttpServlet         Override     protected void doPost HttpServletRequest request  HttpServletResponse response  throws ServletException  IOException           MyClass myClass   new MyClass             if  request getParameter  button1      null                myClass method1              else if  request getParameter  button2      null                myClass method2              else if  request getParameter  button3      null                myClass method3              else                                         request getRequestDispatcher   WEB-INF some-result jsp   forward request  response              Alternatively  use  lt button type  submit  gt  instead of  lt input type  submit  gt   then you can give them all the same name  but an unique value  The value of the  lt button gt  won t be used as label  you can just specify that yourself as child   E g    lt form action    pageContext request contextPath  myservlet  method  post  gt       lt button type  submit  name  button  value  button1  gt Button 1 lt  button gt       lt button type  submit  name  button  value  button2  gt Button 2 lt  button gt       lt button type  submit  name  button  value  button3  gt Button 3 lt  button gt   lt  form gt    with   WebServlet   myservlet   public class MyServlet extends HttpServlet         Override     protected void doPost HttpServletRequest request  HttpServletResponse response  throws ServletException  IOException           MyClass myClass   new MyClass            String button   request getParameter  button             if   button1  equals button                 myClass method1              else if   button2  equals button                 myClass method2              else if   button3  equals button                 myClass method3              else                                         request getRequestDispatcher   WEB-INF some-result jsp   forward request  response              See also    Servlet returns  quot HTTP Status 404 The requested resource   servlet  is not available quot  How do I pass current item to Java method by clicking a hyperlink or button in JSP page

User · Answer

You can try adding action    yourBean function1   on each button  changing of course the method function2  function3  or whatever you need   If that does not work  you can try the same with the onclick event   Anyway  it would be easier to help you if you tell us what kind of buttons are you trying to use  a4j commandButton or whatever you are using

User · Answer

If you have web xml then   HTML JSP   lt form action    pageContext request contextPath  myservlet  method  post  gt       lt input type  submit  name  button1  value  Button 1    gt   lt  form gt    web xml   lt servlet gt           lt display-name gt Servlet Name lt  display-name gt           lt servlet-name gt myservlet lt  servlet-name gt           lt servlet-class gt package SomeController lt  servlet-class gt   lt  servlet gt   lt servlet-mapping gt       lt servlet-name gt myservlet lt  servlet-name gt       lt url-pattern gt  myservlet lt  url-pattern gt   lt  servlet-mapping gt    Java SomeController java  public void doPost HttpServletRequest request  HttpServletResponse response  throws ServletException  IOException           System out println  Write your code below

[jsp] How do I call a specific Java method on a click/submit event of a specific button in JSP?

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