java Session

存 session:
request.getSession().setAttribute("名字", 值);

取 session

String message = (String) request.getSession().getAttribute("名字");

清空session

Enumeration em = request.getSession().getAttributeNames();
while(em.hasMoreElements()){
 request.getSession().removeAttribute(em.nextElement().toString());
}

java Session

原文：https://www.cnblogs.com/cjb1/p/9574531.html