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我有一個jsp頁面，其中有員工鏈接列表。當用戶點擊一個鏈接時，關聯的emp_id將被觸發到數據庫，並且emps細節將顯示在最終的查看頁面。使用EL迭代存儲在數組中的複選框值
SO 3 M試圖這樣做雖然顯示使用EL和麪臨的問題，EMP細節..
這是我最後的視圖頁面代碼。
viewEmp.jsp
<%@page import="com.connection.util.*"%>
<%@page import="com.fulcrum.model.*"%>
<%@page import="java.sql.*"%>
<%@page import="com.fulcrum.service.FinalEmpRecords"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@page import="java.util.ArrayList"%>
<%@page isELIgnored="false" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<body>
<p style = "font-size: medium; color: green">
<%
if (request.getAttribute("success") != null) {
%>
<%=request.getAttribute("success")%>
<%
}
%></p>
<h3>Employee Details</h3>
<%!
Statement statement;
ResultSet resultEmpHobbies;
%>
<%
String id = request.getParameter("empcode");
Connection connect = ConnectionHandler.getConnection();
statement = connect.createStatement();
try{
FinalEmpRecords viewEmp = new FinalEmpRecords();
Employee emp=viewEmp.viewRecord(id);
System.out.println ("empppppppp"+emp);
request.setAttribute ("empobj", emp);
Employee emphobbies=(Employee)request.getAttribute("empobj");
String hobbies[]=emphobbies.getHobbies();
request.setAttribute("hobbies", hobbies);
%>
ID : ${empobj.empcode}
<br>
<br>
Name : ${empobj.fname} ${empobj.lname}
<br>
<br>
age: ${empobj.age}
<br>
<br>
email address : ${empobj.email}
<br>
<br>
password : ${empobj.pwd}
<br>
<br>
date of birth : ${empobj.date} ${empobj.month} ${empobj.year}
<br>
<br>
Gender : ${empobj.gender}
<br>
<br>
About Me : ${empobj.aboutMe}
<br>
<br>
Hobbies
<c:forEach items="hobbies" var="hobb">
${hobb.hobbies}
</c:forEach>
<%
} catch (Exception e) {
System.out.println ("error");
System.out.println (e.toString()+"<br>");
e.printStackTrace();
}
%>
<br>
<br>
<%
if(request.getParameter("page") != null) {
%>
<a href = 'welcomeEmp.jsp'> GO back Welcome page </a>
<%
} else {
%>
<a href = 'welcomeEmp.jsp'> GO back Welcome page </a>
<%
}
%>
</body>
</html>
我的java類
FinalEmpRecords.java
package com.fulcrum.service;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import com.connection.util.ConnectionHandler;
import com.fulcrum.model.Employee;
public class FinalEmpRecords {
private Statement statement;
private Statement statement1;
private ResultSet result;
private ResultSet resultEmpHobbiesResult;
String[] hobbies = new String[10];
int counter = 0;
public Employee viewRecord(String id) throws SQLException {
// ConnectionHandler handler = new ConnectionHandler();
ArrayList<String> listhobbies = new ArrayList<String>();
Employee emp = new Employee();;
System.out.println("id final view=" + id);
try {
Connection connect = ConnectionHandler.getConnection(); //handler.makeconnection();
statement = connect.createStatement();
statement1 = connect.createStatement();
System.out.println("connection established");
result = statement
.executeQuery("select emp_id,f_name,l_name,age,email_id,pwd,date,month,year,gender,aboutme from employee_validation.ev_employee where emp_id='"
+ id + "'");
while(result.next()) {
System.out.println("in final while");
emp.setEmpcode(result.getString(1));
emp.setFname(result.getString(2));
emp.setLname(result.getString(3));
emp.setAge(result.getString(4));
emp.setEmail(result.getString(5));
emp.setPwd(result.getString(6));
emp.setDate(result.getInt(7));
emp.setMonth(result.getString(8));
emp.setYear(result.getInt(9));
emp.setGender(result.getString(10));
emp.setAboutMe(result.getString(11));
System.out.println("after final while");
}
resultEmpHobbiesResult = statement.executeQuery("SELECT hobbies.hobby_name FROM employee_validation.employee_hobbies,employee_validation.hobbies WHERE employee_hobbies.hobby_id=hobbies.hobby_id AND employee_hobbies.emp_id='"+id+"'");
while (resultEmpHobbiesResult.next()) {
hobbies[counter] = resultEmpHobbiesResult.getString(1);
//listhobbies.add(e)
System.out.println("hobbiessssss"+hobbies[counter]);
counter++;
}
emp.setHobbies(hobbies);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println ("final emppp"+emp);
return emp;
}
}
當我嘗試打印這樣的細節，則數組值出現blank..and拋出此異常：
error
javax.el.PropertyNotFoundException: Property 'hobbies' not found on type java.lang.String<br>
javax.el.PropertyNotFoundException: Property 'hobbies' not found on type java.lang.String
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:237)
at javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:214)
at javax.el.BeanELResolver.property(BeanELResolver.java:325)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:85)
at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
at org.apache.el.parser.AstValue.getValue(AstValue.java:183)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:1026)
at org.apache.jsp.viewEmp_jsp._jspx_meth_c_005fforEach_005f0(viewEmp_jsp.java:238)
at org.apache.jsp.viewEmp_jsp._jspService(viewEmp_jsp.java:172)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
我錯過了..給予好評從我身邊 –