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<tr>
<td><label for="username">用户名</label></td>
<td><input type="text" id="username" name="user.username"></td>
</tr>
<% String name = request.getParameter("user.username");
session.setAttribute("name",name);%>
HttpServletRequest request=ServletActionContext.getRequest();//获得session
HttpSession session=request.getSession();
String a = (String) session.getAttribute("name");
System.out.println(a);