Question

我正在尝试使用简单查询填充下拉列表。我尝试在控制台上打印查询输出，它工作正常，但它似乎没有填充下拉列表。

这是我的java文件

    package testpkg;
    import java.sql.DriverManager;
    import java.sql.Connection;
    import java.sql.SQLException;
    import java.sql.*;


public class Facility
{
    public Statement st; 
    public void get_connection()
     {
         try
         {
             Class.forName("oracle.driver.OracleDriver");
         }
         catch(ClassNotFoundException e)
         {
            System.out.println("Oracle JDBC driver missing. Connection to Database failed!!");
            e.printStackTrace();
            return;
         }
         System.out.println("Oracle JDBC Driver Registered");
         Connection con = null;

         try
         {
             con = DriverManager.getConnection("jdbc:oracle:thin:@10.201.301.111:1521:PIC1","ID","PASS");
         }
         catch(SQLException e)
         {
             System.out.println("Connection Failed!! Check console for error code!!");
             e.printStackTrace();
             return;
         }
         if(con !=null)
         {
             System.out.println("Database Connection Successful!");
         }
         try
         {
             con.close();
         }
         catch(Exception e){}
     }   
}

这是另一个java类

package testpkg;

import java.sql.*;

public class state extends Facility
{
    public ResultSet getStates()
    {   
        ResultSet rs = null;
        try
        {
            get_connection();
            rs= st.executeQuery("select org.org_name from organization org");

        }
        catch (Exception e){}
        return (rs);
    }
}

这是JSP代码

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<%@page import = "java.io.PrintWriter" %>
<%@page import="java.sql.*"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.SQLException"%>
<%@page import="testpkg.state"%>

<%
try
{
    state s = new state();          //initializing the state.java class
    ResultSet rs= s.getStates();    //calling the method getStates from state.java
    String data;%>

    <select id="combos" name="org">

    <%while(rs.next())
    {
        data = rs.getString("ORG_NAME");%>
        <option value= "<%=data %>"> <%=data%> </option>            
    <%}%>
    </select>
<%}
catch(Exception e){}%>

JSP下拉菜单没有填充

0 个答案: