数据显示解决办法

数据显示
用struts2 为什么从数据库中读取的数据在页面中无法显示
从数据库中读取问题信息的代码如下：
package teachinves.db;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import teachinves.bean.question;
import teachinves.bean.teacher;

import DBConn.Odb;

public class lessonDAO {
Odb odb=new Odb();

public List<question> allquestion(){
List<question> list=new ArrayList<question>();
String sql="select * from QUESTION_LIST";
try{
PreparedStatement ps=odb.getConnection().prepareStatement(sql);
ResultSet rs=ps.executeQuery(sql);
while(rs.next()){
question que=new question();
que.setVquestionid(rs.getString("vquestionid"));
que.setVquestiontitle(rs.getString("vquestiontitle"));
que.setVquestioncontent(rs.getString("vquestioncontent"));
que.setDquestiontime(rs.getDate("dquestiontime"));
que.setVlessonid(rs.getString("vlessonid"));
que.setVteacherid(rs.getString("vteacherid"));
que.setVquizstudentid(rs.getString("vquizstudentid"));
que.setVlabelid(rs.getString("vlabelid"));
que.setIstateid(rs.getInt("istateid"));
que.setVquestionstatid(rs.getString("vquestionstatid"));
que.setVmerat(rs.getInt("vmerat"));
que.setVdescription(rs.getString("vdescription"));
que.setVevaluate(rs.getString("vevaluate"));
que.setVsuggestion(rs.getString("vsuggestion"));
list.add(que);

}
}catch (Exception e){
e.printStackTrace();
}finally{
odb.close();
}
return list;

}
}

其中的action代码如下：
package teacher.action;

import java.util.ArrayList;
import java.util.List;

import javax.management.Query;

import DBConn.test;

import com.bean.statistic;
import com.opensymphony.xwork2.ActionSupport;

import teachinves.bean.question;
import teachinves.bean.teacher;
import teachinves.db.lessonDAO;
import teachinves.db.statisticDao;

public class QuestionAction extends ActionSupport {
private static final String SUCCESS = null;
private List<question> allquestion;

public List<question> getAllquestion() {
return allquestion;
}

public void setAllquestion(List<question> allquestion) {
this.allquestion = allquestion;
}
public String excute(){
lessonDAO ld=new lessonDAO();

ld.allquestion();

return SUCCESS;
}

}

struts.xml文件配置：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<include file="struts-default.xml"></include>
<package name="struts2" extends="struts-default" >
<action name="allquestion" class="teacher.action.QuestionAction" method="getAllquestion">
<result name="success">/index.jsp</result>
</action>
</package>
</struts>

最后jsp页面：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%@ taglib uri="/struts-tags" prefix="s" %>
<%@ page import="DBConn.Odb" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<s:iterator value="allquestion" status="st">
<ul class="allul">
<li class="allli"><s:property value="vquestionid"/></li>
<li class="allli"><s:property value="vquestiontitle"/></li>
</ul>
</s:iterator>

</body>
</html>

数据可以读出来，但不知道为什么不能在页面中显示

[解决办法]
你的allquestion 里面有值吗？

数据显示解决办法

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