一、JSP-->Servlet

1、表单传值

JSP :<input type="text" name="A" value="B">

Servlet: String str = request.getParameter("A");

2、url传值

JSP: <form action=JSPServlet?name="zhoujie">

Servlet: String str = request.getParameter("name");

二、Servlet-->JSP

Servlet: request.setAttribute("Key",values)

JSP: (String)request.getAttribute("Key")