Accessing post variables using Java Servlets

Question

What is the Java equivalent of PHP s   POST  After searching the web for an hour  I m still nowhere closer

User · Accepted Answer

Your HttpServletRequest object has a getParameter String paramName  method that can be used to get parameter values   http   java sun com javaee 5 docs api javax servlet ServletRequest html getParameter java lang String

User · Answer

POST variables should be accessible via the request object  HttpRequest getParameterMap    The exception is if the form is sending multipart MIME data  the FORM has enctype  multipart form-data    In that case  you need to parse the byte stream with a MIME parser  You can write your own or use an existing one like the Apache Commons File Upload API

User · Answer

Here s a simple example  I didn t get fancy with the html or the servlet  but you should get the idea   I hope this helps you out    lt html gt   lt body gt   lt form method  post  action   myServlet  gt   lt input type  text  name  username    gt   lt input type  password  name  password    gt   lt input type  submit    gt   lt  form gt   lt  body gt   lt  html gt    Now for the Servlet  import java io    import javax servlet    import javax servlet http     public class MyServlet extends HttpServlet     public void doPost HttpServletRequest request                      HttpServletResponse response        throws ServletException  IOException        String userName   request getParameter  username        String password   request getParameter  password

User · Answer

For getting all post parameters there is Map which contains request param name as key and param value as key   Map params   servReq getParameterMap      And to get parameters with known name normal  String userId servReq getParameter  user id

User · Answer

The previous answers are correct but remember to use the name attribute in the input fields  html form  or you won t get anything  Example         lt input type  text  id  username    gt   lt  -- won t work -- gt       lt input type  text  name  username    gt   lt  -- will work -- gt       lt input type  text  name  username  id  username    gt   lt  -- will work too -- gt    All this code is HTML valid  but using getParameter java lang String  you will need the name attribute been set in all parameters you want to receive

[java] Accessing post variables using Java Servlets

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