Jappletフォームデータベースから値を取得する

Question

私はJAppletで非常に新しく、これを今やったことがあります。

package myform; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.Statement; 
import javax.swing.JComboBox; 

public class Form extends javax.swing.JApplet { 

    /** Initializes the applet Form */ 
    public void init() { 
     try { 
      java.awt.EventQueue.invokeAndWait(new Runnable() { 
       public void run() { 
        initComponents(); 
       } 
      }); 
     } catch (Exception ex) { 
      ex.printStackTrace(); 
     } 
     JComboBox list = new JComboBox(); 
     try 
     { 
String connstr="jdbc:oracle:thin:@localhost:1521/XE"; 
String uname="epolicia"; 
String pass="admin"; 
Class.forName("oracle.jdbc.OracleDriver").newInstance(); 
Connection connect =DriverManager.getConnection(connstr,uname,pass); 
System.out.println("Oracle driver is loaded"); 
Statement state=connect.createStatement(); 
ResultSet rs = state.executeQuery("SELECT * FROM ZONE"); 

while (rs.next()) { 
    list.addItem(rs.getString(1)); 
    //System.out.println(rs.getString(1)); 
} 

     } 
     catch(Exception ex) 
     { 
list.addItem(ex); 
     } 
    } 

    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code"> 
    private void initComponents() { 

     jTextField1 = new javax.swing.JTextField(); 
     jLabel1 = new javax.swing.JLabel(); 
     jLabel2 = new javax.swing.JLabel(); 
     jTextField2 = new javax.swing.JTextField(); 
     jLabel3 = new javax.swing.JLabel(); 
     zoneList = new javax.swing.JComboBox(); 
     addDistrict = new javax.swing.JButton(); 
     cancelDistrict = new javax.swing.JButton(); 
     jLabel4 = new javax.swing.JLabel(); 

     jLabel1.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N 
     jLabel1.setText("District ID :"); 

     jLabel2.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N 
     jLabel2.setText("District Name :"); 

     jLabel3.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N 
     jLabel3.setText("Zone :"); 

     addDistrict.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N 
     addDistrict.setText("Add"); 
     addDistrict.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       addDistrictActionPerformed(evt); 
      } 
     }); 

     cancelDistrict.setFont(new java.awt.Font("Times New Roman", 1, 12)); // NOI18N 
     cancelDistrict.setText("Cancel"); 
     cancelDistrict.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       cancelDistrictActionPerformed(evt); 
      } 
     }); 

     jLabel4.setFont(new java.awt.Font("Times New Roman", 1, 24)); // NOI18N 
     jLabel4.setText("Add New District"); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(101, 101, 101) 
         .addComponent(addDistrict) 
         .addGap(28, 28, 28) 
         .addComponent(cancelDistrict)) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(47, 47, 47) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
          .addComponent(jLabel1) 
          .addComponent(jLabel2) 
          .addComponent(jLabel3)) 
         .addGap(28, 28, 28) 
         .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
          .addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 157, Short.MAX_VALUE) 
          .addComponent(jTextField2) 
          .addComponent(zoneList, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE))) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(101, 101, 101) 
         .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 190, javax.swing.GroupLayout.PREFERRED_SIZE))) 
       .addContainerGap(87, Short.MAX_VALUE)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addGap(19, 19, 19) 
       .addComponent(jLabel4) 
       .addGap(36, 36, 36) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(jLabel1)) 
       .addGap(18, 18, 18) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(jLabel2)) 
       .addGap(18, 18, 18) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(zoneList, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addComponent(jLabel3)) 
       .addGap(36, 36, 36) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(addDistrict) 
        .addComponent(cancelDistrict)) 
       .addContainerGap(112, Short.MAX_VALUE)) 
     ); 
    }// </editor-fold> 

    private void addDistrictActionPerformed(java.awt.event.ActionEvent evt) { 
     // TODO add your handling code here: 
    } 

    private void cancelDistrictActionPerformed(java.awt.event.ActionEvent evt) { 
     // TODO add your handling code here: 
     System.exit(0); 

} 


    // Variables declaration - do not modify 
    private javax.swing.JButton addDistrict; 
    private javax.swing.JButton cancelDistrict; 
    private javax.swing.JLabel jLabel1; 
    private javax.swing.JLabel jLabel2; 
    private javax.swing.JLabel jLabel3; 
    private javax.swing.JLabel jLabel4; 
    private javax.swing.JTextField jTextField1; 
    private javax.swing.JTextField jTextField2; 
    private javax.swing.JComboBox zoneList; 
    // End of variables declaration 

} 

そして、私はこの出力に

を取得しています。しかし、値がコンボボックスに表示されていません。値段が必要です<option value='<%=rs.getString(1)%>'><%=rs.getString(2)%></option>

私を助けてください！事前に感謝

Answer 1

2コンボボックス：listとzoneListを作成しました。 DBからlistを入力し、UIにzoneListを表示しています。このため、zoneListは空です。