jsp与java文件传递数据可以使用Servlet类来传递，jsp将数据存入到request对象中，Servlet类获取这个request对象，并将数据取出。
示例代码如下：
JSP代码：<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Demo</title>
</head>
<body>
<form action="/demoServlet" method="post">
<input type="text" name="name"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
Servlet代码：
public class DemoServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("name");//获取jsp页面输入的参数
System.out.println(name);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
表单提交之后，调用Servlet类的方法，通过request对象获取jsp页面传入的参数值，实现数据的传递。