http://blog.csdn.net/finelife/article/details/1608632

1.写入session
Object sessionName = "name";
Object sessionValue = "http://www.mamicode.com/value";

HttpSession session = (HttpSession)FacesContext.getCurrentInstance().getExternalContext().getSession(true);

session.setAttribute(sessionName,sessionValue);

2.获取session值

String getName = session.getAttribute("name").toString();


3.清除session

session.invalidate();