How to solve the JSP: forward by value is empty-CodePudding

<% @ page language="Java" contentType="text/HTML. Charset=utf-8 "
PageEncoding="utf-8" % & gt;

<meta HTTP - equiv="content-type" Content="text/HTML. Charset=utf-8 "& gt;
Insert the title here

<body>

<% @ page language="Java" contentType="text/HTML. Charset=utf-8 "
PageEncoding="utf-8" % & gt;

<meta HTTP - equiv="content-type" Content="text/HTML. Charset=utf-8 "& gt;
Insert the title here

<body>
<%! String STR. % & gt;
<%
STR=request. The getParameter (" num1 ");

% & gt;

To get their values are: you & lt; BR>
<% %=STR & gt;

Results:
Pass your values are:
Null

What's the problem?