数据显示解决办法

2012-01-22

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

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？

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