经过一个小时的扎实研究,我仍然无法做到这一点。
这是我的 Servlet 代码:
package com.fdm.ProjectWeb.RedirectServlets;
import java.awt.List;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.naming.spi.DirStateFactory.Result;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.jstl.sql.ResultSupport;
import com.fdm.ProjectWeb.Controller.ValidateRegisterInputController;
import com.fdm.ProjectWeb.Model.OraclePullListOfUsers;
import com.fdm.ProjectWeb.Model.OracleUserManagement;
public class VerifyRedirect extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
OraclePullListOfUsers pull = new OraclePullListOfUsers();
ResultSet rs = pull.unverifiedUsers();
List list = new List();
try {
while (rs.next()){
list.add(rs.getString(1));
}
} catch (SQLException e) {
e.printStackTrace();
}
req.setAttribute("list", list);
RequestDispatcher rd = req.getRequestDispatcher("./WEB-INF/VerifyUser.jsp");
rd.forward(req, resp);
}
}
这是我的 .JSP 代码:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>Verify Users</title>
</head>
<body>
<table>
<c:forEach items="${list}" var="item">
<tr>
<td><c:out value="${item}" /></td>
</tr>
</c:forEach>
</table>
<h2>Please enter the Username of the user you want to verify</h2>
<form action="loginform" method="POST">
<label>User To Verify: <input type="text" name="userToVerify" id="userToVerify" /></label><br />
<input type="submit" value="Submit" name="submit" />
</form>
</body>
结果集肯定有数据,就像我在 while 循环中的 system.out.println 一样,它显示了所有正确的值。
我收到此错误消息:
javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in <forEach>
任何帮助,将不胜感激!
javax.servlet.jsp.JspTagException:不知道如何迭代 中提供的“items”
当您的<c:forEach items>
不指的是Object,可以迭代。这Object应该是Iterable
, a Map
, or an array.
很明显,你的list属性指的是不属于上述任何类别的类型。虽然该类型实际上是一个List
, 但不是java.util.List
.
检查您的进口声明:
import java.awt.List; // Here is the fault
它应该是:
import java.util.List;
另外,您应该使用泛型类型List
而不是原始类型。改变:
List list = new List();
to:
List<String> list = new List<String>();
另外,看起来你正在做预处理任务在doPost()
方法。不。doPost()是用来后期处理一个要求 https://stackoverflow.com/tags/servlets/info。你应该使用doget()
方法用于预处理.
将所有代码移入doPost()
to doGet()
method.
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