在运行时从创建的JTextfield获取值

Question

I've made an application that will get the column name of the database and create a jlabel and jtextfield at runtime based on the column names of the db.

Here's the code snippet: Im using Netbeans here...

 public void getColumn(){
        String sql = "SELECT * from user";
        jPanel.setLayout(new GridLayout(0,2));

        try {
            pst = conn.prepareStatement(sql);
            rs = pst.executeQuery();
            ResultSetMetaData rsmd = rs.getMetaData();
            int columnCount = rsmd.getColumnCount();

            ArrayList<String> columns= new ArrayList<String>();
            for(int i = 1; i<= columnCount; i++){
                columns.add(rsmd.getColumnName(i));
                System.out.println(String.valueOf(columns));
            }
            ArrayList<JTextField> fields = new ArrayList<JTextField>();
        for(int i = 0; i <columns.size();i++){
                JLabel jl = new JLabel(String.valueOf(columns.get(i)));
            jPanel.add(jl);
            JTextField f = new JTextField(50);
            fields.add(f);
            jPanel.add(f);
                        this.revalidate();
                        this.repaint();
               }

        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, e.getMessage());
        }
    }

This will be the sample output.

id | ______________
fName | _____________
mName | _______________
lName | ________________

lines referring to JTextFields..

However, I can't get the values entered in the jtextfields. I've tried using the code below. But no luck. Any help appreciated.

for(JTextField field : fields){
                JOptionPane.showMessageDialog(null, field.getText());
        }

Answer 1

May be you can try this:

Component children[] = jp.getComponents();
for(Component child : children) {
  if(child instanceof JTextField) [
     JOptionPane.showMessageDialog(null, ((JTextField)child).getText());
  }
}

Answer 2

A better solution would be to use a JTable. Read the section from the Swing tutorial on How to Use Tables for more information.

You can also check out Table From Database for some simple code to get you started. See the 'TableFromDatabaseExample' code for the easiest solution.