Dea*_*Iss 3 java jsp servlets jstl resultset
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>
结果集中肯定有数据,就好像我在while循环中的system.out.println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<forEach>中提供的"items"
当您<c:forEach items>没有引用可以迭代的Object时会发生此异常.的对象应或者是Iterable,一个Map,或一个阵列.
很明显,您的列表属性是指不属于上述任何类别的类型.虽然这种类型实际上是一种List,但不是java.util.List.
检查您的import语句:
import java.awt.List; // Here is the fault
它应该是:
import java.util.List;
此外,您应该使用泛型类型List而不是原始类型.更改:
List list = new List();
至:
List<String> list = new List<String>();
此外,您似乎正在进行方法中的预处理任务doPost().别.doPost()用于后处理请求.您应该使用doget()方法进行预处理.
将所有代码doPost()移到doGet()方法中.
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