Hi experts, I got problem in servlet. I have a web page that has two buttons (submit button and update button) , both buttons call the servlet. my question is how I let my servlet program distinguish the two buttons when one of the two buttons is pressed. the servlet contain two different contents , each content will run once the user click one button.
to be more specified, is there something like handling events between servlet and a web page like what we see in java GUI
Jump to PostThere is no such event for html button action. You have to use getParameter() method of HttpServletRequest class.
sample.html<html> ..... <body> <form method="post" action="FirstServlet"> .... <input type="submit" name="cmd" value="Update"/> <input type="submit" name="cmd" value="Delete"/> </form> </body> </html>FirstServlet.java
.... public class FirstServlet extends HttpServlet …
There is no such event for html button action. You have to use getParameter() method of HttpServletRequest class.
sample.html
<html>
.....
<body>
<form method="post" action="FirstServlet">
....
<input type="submit" name="cmd" value="Update"/>
<input type="submit" name="cmd" value="Delete"/>
</form>
</body>
</html>FirstServlet.java
....
public class FirstServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String cmd=request.getParameter("cmd");
if(cmd!=null) {
if(cmd.equals("Update")) {
... statements...
}
else
if(cmd.equals("Delete")) {
... statements...
}
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}thank you I got the point
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