html - Java Servlets - Make hello world appear on button press -
for school learning servlets, , although understand idea behind them, unsure of how use them in practice. part of piece of work, must create web page in netbeans contains button, , when pressed must invoke servlet display message 'hello, world!'.
i have web-page, 'gethellomessage.xhtml'
<body> <div>click button show message.</div> <p></p> <button type="button">get message</button> </body> and 'helloworldservlet.java'
@webservlet(urlpatterns = {"/helloworldservlet"}) public class helloworldservlet extends httpservlet { @override protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { response.setcontenttype("text/html"); printwriter out = response.getwriter(); out.println("<h1>hello, world!</h1>"); } } how can invoke servlet when user presses button?
to working had edit glassfish-web.xml (located in project> web-inf) , add following lines of code:
<servlet> <servlet-name>helloworldservlet</servlet-name> <servlet-class>helloworldservlet</servlet-class> </servlet> and in gethellomessage.xhtml :
<form action="helloworldservlet" method="get"> <button type="submit">get message</button> </form>
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