我编写了一个连接多个数据库的应用程序(查看link)。我分别有几个包含带有INPUT文本字段的查询面板的选项卡。现在我想到达所选标签中的特定文本字段以查询相关数据库...现在请告诉我如何才能找到它?
我应该提一下,我已经为JPanel创建了一个类,应该将其添加到jTabbedPane中,如下所示:
package testGUI_V2;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.SwingConstants;
import javax.swing.border.BevelBorder;
import static testGUI_V2.DialogBoxTest.service;
public class TabbedPane {
private String state;
private JLabel jLabel3;
private JTextField jTextField2;
private JTextPane jTextPane1;
private JButton jButton4;
private static int item = 0;
private int tabIndex;
public JPanel CreatePanel(){
state = service.toUpperCase();
tabIndex = item;
JPanel inst1 = new JPanel();
String tabTitle =String.format("Query Panel %d",item+1);
inst1.setSize(302, 138);
inst1.setLayout(null);
inst1.setBorder(BorderFactory
.createTitledBorder(BorderFactory
.createEtchedBorder(BevelBorder.LOWERED), tabTitle));
inst1.setPreferredSize(new java.awt.Dimension(321, 108));
jLabel3 = new JLabel("Employee ID", SwingConstants.LEFT);
inst1.add(jLabel3);
jLabel3.setBounds(12, 15, 103, 26);
jLabel3.setVisible(true);
jTextField2 = new JTextField();
inst1.add(jTextField2);
jTextField2.setVisible(true);
jTextField2.setBounds(109, 15, 93, 30);
jTextPane1 = new JTextPane();
inst1.add(jTextPane1);
jTextPane1.setBounds(6, 50, 307, 50);
jButton4 = new JButton("Search");
inst1.add(jButton4);
jButton4.setVisible(true);
jButton4.setBounds(231, 15, 82, 29);
//jButton4.addActionListener(search);
item++;
return inst1;
}
public JTextField getQueryJTextField(){
return jTextField2;
}
public String getPanelState(){
return state;
}
public int getTabIndex(){
return tabIndex;
}
}
此外,以下代码与调用TabbedPane类的createPanel()方法的“Connect”按钮有关:
{
jButton2 = new JButton();
getContentPane().add(jButton2);
jButton2.setText("Connect");
jButton2.setBounds(229, 50, 90, 29);
jButton2.setVisible(false);
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
LinkedFrame inst2 = new LinkedFrame(inst, true);
inst2.setLocationRelativeTo(rootPane);
inst2.setVisible(true);
if (Connector.getProcessStatue()) {
TabbedPane inst= new TabbedPane();
jPanel3.setVisible(true);
tabbedPane1.addTab(connectionItem,null ,info.get(inst.getTabIndex()));
info.add(inst.CreatePanel());
System.out.println(inst.getPanelState());
jButton2.setVisible(false);
jButton3.setVisible(true);
setSize(342, 265);
}
}
});
}
如果我的策略是真的,请告诉我吗?
答案 0 :(得分:1)
我几乎总是为我的GUI编程创建JPanel的子类。当我需要访问组件供以后使用时,我还要确保在我的JPanel类中保留对这些组件的引用,并为我想要检索的数据提供访问器方法:
public class MyPanel extends JPanel {
private JTextField myTextField = new JTextField();
String getText() {
return myTextField.getText();
}
}
我还创建了JFrame的子类来保存我的自定义面板。和JPanel子类一样,我将保留对自定义面板实例的私有引用:
public class MyFrame extends JFrame {
private MyPanel myPanel = new MyPanel();
public MyFrame() {
this.add(myPanel);
JButton someButton = new JButton("Do It!");
someButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
String text = MyFrame.this.myPanel.getText();
// Do something with the text
}
});
}
}
包含MyPanel实例的类可以是任何东西,而不仅仅是JFrame。但是,基本思想适用:子类Swing组件并保留创建后需要访问的组件的引用。