servlet 中session的使用方法（创建，使用）

创建：

 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
     req.setCharacterEncoding("utf-8");
     resp.setContentType("text/html;charset=utf-8");
     //创建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"));
}