I’m trying to learn Servlets/JSP. When I tried the following code I dont get any output. Can someone please help me? When I run the code I get only the header and I dont see the values showing up in the dropdown.
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class VacationTrackerDAO {
public static List<VactionTrackerBean> list() throws SQLException{
List<VactionTrackerBean> appr= new ArrayList<VactionTrackerBean>();
try{
DBConnection conObj=new DBConnection();
Connection dbCon= conObj.getCon();
Statement stmt=conObj.getStmt();
String queryCPList="select * from Capacity_Plan";
String queryApprList="Select First_Last_Name from Vacation_Approvers";
PreparedStatement preStmtCPList=dbCon.prepareStatement(queryCPList);//get metadat
PreparedStatement preStmtApprList=dbCon.prepareStatement(queryApprList);//get names
//ResultSet rsCPList=preStmtCPList.executeQuery();
ResultSet rsApprList=preStmtCPList.executeQuery();
//ResultSetMetaData metaCPList=rsCPList.getMetaData();
VactionTrackerBean vtBean=new VactionTrackerBean();
while(rsApprList.next()){
vtBean.setApprover((rsApprList.getString("First_Last_Name")));
appr.add(vtBean);
}
}catch(Exception e){
System.out.println("In the Vacation TrackerDAO.java class:"+e);
}
return appr;
}
}
Bean:
public class VactionTrackerBean {
private String dates;
private String approver;
public String getDate() {
return dates;
}
public void setDate(String dates) {
this.dates = dates;
}
public String getApprover() {
return approver;
}
public void setApprover(String approver) {
this.approver = approver;
}
}
Servlet:
public class VacationTracker extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try{
List<VactionTrackerBean> vacTracker=VacationTrackerDAO.list();
request.setAttribute("vacTracker", vacTracker);
request.getRequestDispatcher("WEB-INF/VacationTracker.jsp").forward(request,response);
}catch (SQLException e){
System.out.println("Error in VacationTracker.java due to VactionTrackerDA.java:"+e);
request.getRequestDispatcher("WEB-INF/Error.jsp").forward(request,response);
}
}
}
JSP Page:
<%@ 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" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Vacation Tracker</title>
</head>
<body>
<h1> Vacation Tracker </h1>
<div id="main">
<c:forEach items="${vacTracker}" var="vacTracker">
<select id="myselect" name="mydata" size="10">
<option value="${vacTracker.approver}">${vacTracker.approver}</option>
</select>
</c:forEach>
</div>
</body>
</html>
Check you are getting values in list.Put some S.O.P after while loop in DAO class.
Also,There is a mistake in code. It should be
Otherwise, It will create new select for each item.