public String write() { // 新建文章
   User user = (User) session.get("user");
   System.out.println("User的ID是" + user.getUserid());
   News news = new News(user, nvo.getNewstitle(), nvo.getNewscontent(), new Date());
   System.out.println("文章标题是" + news.getNewstitle());
   ns.add(news);
   return "writeSuccess";
 }
 public String delete() { // 文章删除
   news = ns.findById(this.newsid);
   ns.delete(news);
   return "delete";
 }
 public String look() { // 文章具体内容
   news = ns.findById(this.newsid);
   return "look";
 }
 public String list() { // 文章列表
   newslist = ns.findAll();
   return "list";
 }