How to transfer data from JSP to servlet when submitting HTML form

Question

I have a JSP page with an HTML form    lt form action  SERVLET  gt       lt input type  text  name  name   gt  lt br gt               lt input type  text  name  group   gt       lt input type  text  name  pass   gt       lt input type  submit  value  submit  gt               lt  form gt    How to obtain these data in a servlet and add them to database

User · Answer

first up on create your jsp file   and write the text field which you want for ex     after that create your servlet class   public class test   protected void doGet paramter   paramter    String name    request getparameter  name

User · Answer

http   oreilly com catalog javacook chapter ch18 html  Search for     Problem  You want to process the data from an HTML form in a servlet

User · Answer

Well  there are plenty of database tutorials online for java  what you re looking for is called JDBC    But if you are using plain servlets  you will have a class that extends HttpServlet and inside it you will have two methods that look like  public void doPost HttpServletRequest req  HttpServletResponse resp        and  public void doGet HttpServletRequest req  HttpServletResponse resp        One of them is called to handle GET operations and another is used to handle POST operations   You will then use the HttpServletRequest object to get the parameters that were passed as part of the form like so   String name   req getParameter  name      Then  once you have the data from the form  it s relatively easy to add it to a database using a JDBC tutorial that is widely available on the web   I also suggest searching for a basic Java servlet tutorial to get you started   It s very easy  although there are a number of steps that need to be configured correctly

User · Answer

Create a class which extends HttpServlet and put  WebServlet annotation on it containing the desired URL the servlet should listen on    WebServlet   yourServletURL   public class YourServlet extends HttpServlet      And just let  lt form action gt  point to this URL  I would also recommend to use POST method for non-idempotent requests  You should make sure that you have specified the name attribute of the HTML form input fields   lt input gt    lt select gt    lt textarea gt  and  lt button gt    This represents the HTTP request parameter name  Finally  you also need to make sure that the input fields of interest are enclosed inside the desired form and thus not outside   Here are some examples of various HTML form input fields    lt form action    pageContext request contextPath  yourServletURL  method  post  gt       lt p gt Normal text field               lt input type  text  name  name    gt  lt  p gt        lt p gt Secret text field               lt input type  password  name  pass    gt  lt  p gt        lt p gt Single-selection radiobuttons               lt input type  radio  name  gender  value  M    gt  Male      lt input type  radio  name  gender  value  F    gt  Female lt  p gt        lt p gt Single-selection checkbox       lt input type  checkbox  name  agree    gt  Agree  lt  p gt        lt p gt Multi-selection checkboxes       lt input type  checkbox  name  role  value  USER    gt  User      lt input type  checkbox  name  role  value  ADMIN    gt  Admin lt  p gt        lt p gt Single-selection dropdown       lt select name  countryCode  gt           lt option value  NL  gt Netherlands lt  option gt           lt option value  US  gt United States lt  option gt       lt  select gt  lt  p gt        lt p gt Multi-selection listbox       lt select name  animalId  multiple  true  size  2  gt           lt option value  1  gt Cat lt  option gt           lt option value  2  gt Dog lt  option gt       lt  select gt  lt  p gt        lt p gt Text area       lt textarea name  message  gt  lt  textarea gt  lt  p gt        lt p gt Submit button       lt input type  submit  name  submit  value  submit    gt  lt  p gt   lt  form gt    Create a doPost   method in your servlet which grabs the submitted input values as request parameters keyed by the input field s name  not id    You can use request getParameter   to get submitted value from single-value fields and request getParameterValues   to get submitted values from multi-value fields    Override protected void doPost HttpServletRequest request  HttpServletResponse response  throws ServletException  IOException       String name   request getParameter  name        String pass   request getParameter  pass        String gender   request getParameter  gender        boolean agree   request getParameter  agree      null      String   roles   request getParameterValues  role        String countryCode   request getParameter  countryCode        String   animalIds   request getParameterValues  animalId        String message   request getParameter  message        boolean submitButtonPressed   request getParameter  submit      null                 Do if necessary some validation and finally persist it in the DB the usual JDBC DAO way   User user   new User name  pass  roles   userDAO save user     See also    HTML beginner tutorial Our Servlets wiki page doGet and doPost in Servlets How do I call a specific Java method on click submit event of specific button in JSP  How perform validation and display error message in same form in JSP  How can I retain HTML form field values in JSP after submitting form to Servlet  How to upload files to server using JSP Servlet  Show JDBC ResultSet in HTML in JSP page using MVC and DAO pattern Servlet returns  quot HTTP Status 404 The requested resource   servlet  is not available quot

[jsp] How to transfer data from JSP to servlet when submitting HTML form

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