How to get button's name from jsp to servlet

Question

i have to log the parameter and button's name in my log file, i have code like this jsp:

<form action="LoginCheck.jsp" name="logServlet" method="post"> 
            <br/>Username:<input type="text" name="username"/> 
            <br/>Password:<input type="password" name="password"/> 
            <br/><input type="submit" value="Submit" name="bt"/> 
        </form>

servlet(doGET):

String USERNAME, PASSWORD;            
            USERNAME = request.getParameter("username");
            PASSWORD = request.getParameter("password");
            String bt = request.getParameter("bt");
            System.out.println("button value = " + bt);
            writer.println("Username    :" + USERNAME + "<br>" + "Password  :" + PASSWORD + "<br>" + bt);

my result: Username : null Password : null null

just wonder how to get the parameter? thanks...

In your form action, write the name of your Servlet page – Java Enthusiast Jun 28 '14 at 06:48 — Java Enthusiast, Jun 28 '14 at 06:48

Santino 'Sonny' Corleone · Accepted Answer · 2014-06-28T06:17:04.090

0

In the JSP you have given the method as POST and in servlet you have called the doGet() method.

So in your servlet use the doPost() instead of doGet() and you will get your values.

edited Jun 28 '14 at 06:17

answered Jun 28 '14 at 05:13

Santino 'Sonny' Corleone

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dnt forget to tick the answer – Santino 'Sonny' Corleone Jun 28 '14 at 05:19
don't suggest else part because it's sensitive information and you don't want to show the password in URL. – Braj Jun 28 '14 at 06:01
1

Can you explain me how `doGet()` method is called in this case? It's Servlet not JSP. `LoginCheck.jsp` is mapped to Servlet in `web.xml`. – Braj Jun 28 '14 at 06:07
Hi, @Santino'Sonny'Corleone , I have a problem after cut and paste my code in doGet() to doPost(), it show a 404 error page after i submit my username and password. in my login page i have change my form to
need your help
– raymond_wmt Jun 29 '14 at 13:50
@Santino'Sonny'Corleone logServlet log.logServlet logServlet /logServletPath i have this in my web.xml – raymond_wmt Jun 30 '14 at 07:45
@user3736728 web.xml seems to be fine..hope u restarted your server after making changes on your web.xml.. – Santino 'Sonny' Corleone Jun 30 '14 at 07:50
@user3736728 just noticed in your question,your action goes to a JSP page(LoginCheck.jsp).Is that proper?or should it go to a servlet? – Santino 'Sonny' Corleone Jun 30 '14 at 07:51
i changed my action to logServletPath already but the problem still there. i will try to restart my server first. By the way, thanks a lot for your helping. – raymond_wmt Jun 30 '14 at 10:05
@raymond_wmt no problem...after making changes to web.xml u need to restart d server always – Santino 'Sonny' Corleone Jun 30 '14 at 10:11

score 0 · Answer 2 · answered Jun 28 '14 at 07:00

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I wonder how could you get your values printed from your servlet page as you have specified the form action as the name of your JSP page instead of your servlet page..

So first the change the form action as the name of your servlet page which is I think logServlet in your case instead of specifying the name of JSP page i.e LoginCheck.jsp and then make the changes as specified by Santino i.e. use doPost() in your Servlet instead of doGet()

answered Jun 28 '14 at 07:00

Java Enthusiast

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just a simple question again. can i have 2 actions in one
?? because i create the loginCheck.jsp is for some if...else statement. and the logServlet is to record the parameters filled by user. TQ
– raymond_wmt Jun 28 '14 at 15:39
No you cannot have 2 actions in one form..if you have different buttons in one form then either you can give the form action of same page and then check for button click and send to different pages correspondingly or you can send it to servlet page and then check button click over there..but 2 actions in one form not possible – Java Enthusiast Jun 28 '14 at 16:52
In your case what you can do that is send it to single servlet page and do both the actions on that page i.e. logincheck and record parameters – Java Enthusiast Jun 28 '14 at 16:53
@user3736728 If it helped do tick the answer – Java Enthusiast Jun 30 '14 at 05:51

How to get button's name from jsp to servlet

2 Answers2