servlet 如何传值给JSP，并遍历

Question

各位大佬本自学小白又来问问题

resp.setCharacterEncoding("UTF-8");
req.setAttribute("list", list);
req.getRequestDispatcher("/index.jsp").forward(req,resp); 

如何将servlet中的list传到，并遍历到表里

<table border="1">
  <tr>
    <th>员工编号</th>
    <th>员工姓名</th>
    <th>部门名称</th>
    <th>签到时间</th>
  </tr>


</table>

---

    <table border="1">
        <tr>
            <th>员工编号</th>
            <th>员工姓名</th>
            <th>部门名称</th>
            <th>签到时间</th>
        </tr>

        <c:forEach items="${list}" var="dataList">
            <tr>
                <td>${dataList.pin}</td>
                <td>${dataList.Name}</td>
                <td>${dataList.defaultdeptid}</td>
                <td>${dataList.checktime}</td>
            </tr>
        </c:forEach>


    </table>

我在jsp页面遍历之后出错

重: Servlet.service() for servlet [indexervlet] in context with path [/zpyr] threw exception [An exception occurred processing JSP page /index.jsp at line 33

30:         <c:forEach items="${list}" var="dataList">
31:             <tr>
32:                 <td>${dataList.pin}</td>
33:                 <td>${dataList.Name}</td>
34:                 <td>${dataList.defaultdeptid}</td>
35:                 <td>${dataList.checktime}</td>
36:             </tr>


Stacktrace:] with root cause

Answer 1

req.setAttribute("list", list);//传一个list过去。
req.getRequestDispatcher("/index.jsp").forward(req,resp);//跳转并把数据传到该index.jsp页面
//在index.jsp页面用c标签获取遍历。list.属性

<table border="1">
  <tr>
    <th>员工编号</th>
    <th>员工姓名</th>
    <th>部门名称</th>
    <th>签到时间</th>
  </tr>
<c:forEach item="${list}" var="list">
<tr>
                <td>
            ${list.bh}
        </td>
        <td>
            ${list.name}
        </td>
        <td>
            ${list.mc}
        </td>
                <td>
            ${list.time}
        </td>
</tr>
</c:forEach>

</table>

Answer 2

foreach
去里面的值：比如 员工编号：$｛list.id｝

Answer 3

              HttpSession s = request.getSession();
                s.setAttribute("urlCode", urlCode);
                s.setAttribute("order_price", order_price);
                s.setAttribute("out_trade_no", out_trade_no);
                request.getRequestDispatcher("./PCWeiXin.jsp").forward(request, response);//往页面传值


                                <%
                  String URL = (String) request.getSession().getAttribute("urlCode");
                      String order_price =(String)request.getSession().getAttribute("order_price");
                      //String out_trade_no = (String) request.getSession().getAttribute("out_trade_no");
                     String out_trade_no="2019050412491900001";
                         System.out.print(URL+"aa");接收传过来的值

%>
style="display:none;" />
吧变量放在input里，跟你的table一样

Answer 4

<table border="1">
  <tr>
    <th>员工编号</th>
    <th>员工姓名</th>
    <th>部门名称</th>
    <th>签到时间</th>
  </tr>
<c:forEach items="${list}" var="dataList">
    <tr>
        <td>
            ${dataList.code}
        </td>
        <td>
            ${dataList.name}
        </td>
        <td>
            ${dataList.***}
        </td>
        ...
    </tr>
</c:forEach>

</table>

Answer 5

https://blog.csdn.net/lurao/article/details/51335414