JSP simple exercise-el get form data

Enter the user name and password interface:

<%@ page language= "java" contenttype= "text/html;charset=gb2312"%><script type= "Text/javascript" > function On_submit () {if (form1.username.value== "") {alert ("User name cannot be empty!"); /automatically switches the focus to the username input box Form1.username.focus (); return false;} if (form1.password.value== "") {alert ("Password cannot be empty!"); /automatically switches the focus to the password input box Form1.password.focus (); return false;}} </script>Show the data in the received form:
<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"%>