用四种方式在jsp页面打印hello world

Sure, here are four different ways to print "hello world" in a JSP page:

1. Using a scriptlet:

<%
    out.print("hello world");
%>

2. Using an expression tag:

<%= "hello world" %>

3. Using a JSP declaration:

<%! String message = "hello world"; %>
<%= message %>

4. Using a JSTL tag:

<c:set var="message" value="hello world" />
${message }