servlet 中session的使用方法（創建，使用）

創建：

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    req.setCharacterEncoding("utf-8");
    resp.setContentType("text/html;charset=utf-8");
    //創建session
    HttpSession session=req.getSession();
    session.setAttribute("name", "周博");
}

使用：

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
 {
    req.setCharacterEncoding("utf-8");
    resp.setContentType("text/html;charset=utf-8");
    HttpSession session=req.getSession();
    PrintWriter out=resp.getWriter();
        out.println(session.getAttribute("name"));
}