Java Servlet Page技术 即是 JSP技术

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>






<%-- 


--%>
HelloWorld
<%out.println(request.getAttribute("username")); %>
<% 
int a = 123;
System.out.println(a);
%>
<%!

private int a = 123;
public int b = 456;
public int add(int a ,int b){
	return a + b;
}
%>
<%
System.out.println(add(3, 4));
%>
<%=a%>


<%=add(3, 7)%>

在这里插入代码片