字符串无法转换为 ArrayList<String>当获取为 request.getParameter(" ") [英] string cannot be converted to ArrayList<String> when getting as request.getParameter(" ")
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问题描述
从另一个jsp获取jsp中的List值作为request.getParameter("")
Getting List values in jsp as request.getParameter("") from another jsp
a.jsp
List<String> abc =
(ArrayList<String>)request.getAttribute("studentsrollno");// got
studentsrollno from servlet by request.setAttribute();
<form action="b.jsp" method="post">
<input type="hidden" name="rollno" value="<%=abc%>"/>
<input type="submit">
</form>
b.jsp
<%
List<String> a2 = (ArrayList<String>) request.getParameter("rollno");//
getting error string cannot be converted to ArrayList<String> // How can I
display data rollno here ?
// Iterator<String> itr = a2.iterator();
%>
非常感谢
推荐答案
您可以以数组的形式检索值:
You can retrieve the values as an array:
String[] vals = request.getParameterValues("rollno");
这些值应该作为单独的表单参数发出:
The values should be emitted as separate form parameters:
<c:foreach items="${abc}" var="item">
<input type="hidden" name="rollno" value="${fn:escapeXml(item)}" />
</c:foreach>
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