JSP在bean中找不到属性 [英] JSP not finding property in bean
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问题描述
我的JSP给出一个错误，表明它无法在DTO中找到属性，但是在DTO中该属性确实存在.错误如下:
My JSP gives an error showing that it is not able to find a property in a DTO and yet in the DTO the property is really there. Below is the error:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /addPos.jsp at line 101
98:
99: --%>
100:
101: ${dt.date}
102:
103:
104:
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
root cause
javax.el.PropertyNotFoundException: Property 'date' not found on type p1.dateDto
javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:193)
javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:170)
javax.el.BeanELResolver.property(BeanELResolver.java:279)
javax.el.BeanELResolver.getValue(BeanELResolver.java:60)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
org.apache.el.parser.AstValue.getValue(AstValue.java:118)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:935)
org.apache.jsp.addPos_jsp._jspx_meth_c_005fforEach_005f0(addPos_jsp.java:227)
org.apache.jsp.addPos_jsp._jspService(addPos_jsp.java:168)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
这是dateDto类:
Here is the dateDto class:
package p1;
import java.sql.Date;
/**
*
* @author kk
*/
public class dateDto
{
private Date date;
public dateDto()
{
}
public dateDto(Date date)
{
this.date =date;
}
public Date getDateDto()
{
return this.date ;
}
}
以下是dateDao:
Below is the dateDao:
package p1;
/**
*
* @author kk
*/
import java.sql.*;
import java.util.*;
public class dateDao {
private List<dateDto> dateList;
private String dbUrl = "jdbc:mysql://localhost/mvs_db";
private String dbDriver = "com.mysql.jdbc.Driver";
private String dbUser = "root";
private String dbPwd = "";
public dateDao() {
}
public List<dateDto> getDateList() {
dateList = new ArrayList<dateDto>();
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
try {//trying to load the database driver and establish a connection to the database
Class.forName(dbDriver);//loading the database driver
con = DriverManager.getConnection(dbUrl, dbUser, dbPwd);//establishing a connection to the database
//pw.println("connection established");//output if connection is established
} catch (Exception e) {
e.printStackTrace();//printing the exception error trace
}
try {
stmt = con.createStatement();
rs = stmt.executeQuery("Select vote_date from voting_date");
while (rs.next()) {
java.sql.Date date = rs.getDate("vote_date");
dateDto s = new dateDto(date);
dateList.add(s);
}
} catch (Exception e) {
System.out.println(e);
} finally {
try {
if (con != null) {
con.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return dateList;
}
}
我实际上是从mysql数据库中检索Date类型的值，并显示在下拉列表中.
I'm actually retrieving Date type values from a mysql database and displying in a dropdown list.
JSP代码如下:
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<jsp:useBean id="dtb" scope="session" class="p1.dateDao"/>
<%--
Document : addCamp
Created on : May 20, 2011, 11:28:31 AM
Author : ken
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style type="text/css">
body {
background-color:#AFC7C7;
padding: 0;
margin: 0;
}
div.wrapper {
margin-left: 10%;
margin-right: 10%;
background-color:#6D7B8D;
height: 607px;
padding-top:0px;
border: thin solid #000000;
}
div#image{
padding-top:1%;
padding-bottom:1%;
}
div#adminlogin{
width:35%;
height:40%;
background-color:#AFC7C7;
border-width:thin;
border-style:solid;
border-color:#000000;
margin: 0 auto;
text-align:left;
overflow: hidden;
padding: 5px;
}
hr {
height:1px;
color:#000000;
background-color:#000000;
width:99%;
margin-left: 0 ;
margin-right: auto ;
border-style:solid;
}
.inputtext {
width: 200px;
height: 30px;
Font-Family:Arial;
Font-Size:18px
}
</style>
<script language="javascript" type="text/javascript">
function clearText(field){
if (field.defaultValue == field.value) field.value = '';
else if (field.value == '') field.value = field.defaultValue;
}
</script>
</head>
<body>
<div class="wrapper">
<div id="image">
<p>
<img src="${pageContext.request.contextPath}/images/logo.gif"
alt="banner"
width=100%
height="100"
/></p>
</div><!--end of image div-->
<div id=adminlogin >
<p style="text-align:center">Adding Voting Position</p>
<hr/>
<form method=POST id="pos" action="${pageContext.request.contextPath}/getPos">
<p/>
<%--The textfield for hostel name--%>
<label>Position<input type="text" id="pos" name="position" value="" class="inputtext"
onFocus="clearText(this)" onBlur="clearText(this)"/></label><br/>
<br/>
<label>Voting Date <select name="dates" size="1" id="pos" class="inputtext"
onFocus="clearText(this)" onBlur="clearText(this)">
<c:forEach items="${dtb.dateList}" var="dt">
<%--<option value="1"><c:out value="${cam.campnm}"/></option>--%>
<option>${dt.date}</option>
</c:forEach>
</select></label>
<br/>
<br/>
<input type="submit" value="Add" style="font-size:14pt; margin-left: 158px; height: 30px;"/>
</form>
<p STYLE="color : #E41B17;">${message}</p>
<c:remove var="message" scope="session" />
</div><%--end of admin login div--%>
<p style="text-align: center"><a href=adminHome.jsp>Home</a> <a href=index.jsp>Logout</a></p>
</div>
</body>
</html>
可能是什么问题?
推荐答案
您错过了dateDto
制作
public class dateDto
{
private Date date;
public dateDto()
{
}
public dateDto(Date date)
{
this.date =date;
}
public Date getDate()
{
return this.date ;
}
public Date setDate(Date d)
{
this.date = d;
}
}
这篇关于JSP在bean中找不到属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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