servlet里存储数据的list，用<c:forEach>方法一直显示不到jsp页面

Question

servlet：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
//获取所有的书本
List list=new ArrayList();

list=BookDB.findALLBook();
request.setAttribute("list", list);
request.getRequestDispatcher("/main.jsp").forward(request, response);

}

 jsp:
```<c:forEach items="${list}" var="item">
      ${item.bookId}
      ${item.bookName}
      ${item.bookPrice}<br/>

    </c:forEach>

Answer 1

你set的是request作用区域中，遍历直接用el表达式${list} 等价于 <%＝request.getAttribute() >