如何使用正则表达式验证JTable的第一列？

Question

我正在制作一个程序,我必须验证第一列是否是IP地址.

到目前为止,我只想出了如何过滤行的方法.但是在将数据写入文件之前必须检查该列.

有人能帮助我吗？

Answer 1

您可以使用an InputVerifier来验证表格单元格的输入.这样,您不必在所有输入都进入后验证所有内容,如果有许多不正确的输入,这可能会很麻烦.随着InputVerifier您将获得每个单元格输入的验证.

这是一个例子.我不知道,如果正则表达式是IP地址是正确的,但我有一个最后的静态字段,您可以更改为正则表达式是没有,如果这一个不工作.

有了这个特殊情况InputVerifier,如果字段匹配正则表达式,如果字段为空,它将允许焦点更改,否则您将获得错误对话框.

text.matches(IP_REGEX) || text.isEmpty();

import javax.swing.DefaultCellEditor;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellEditor;

public class TableVerifyInput {

    private static final String IP_REGEX = "^(?:[0-9]{1,3}\\.){3}[0-9]{1,3}$";

    public TableVerifyInput() {
        final InputVerifier verifier = getInputVerifier();
        final DefaultCellEditor editor = getTableCellEditor(verifier);

        String[] cols = {"IP address", "Column 2"};
        Object[][] data = {{null, null}, {null, null}};
        DefaultTableModel model = new DefaultTableModel(data, cols);

        JTable table = new JTable(model) {
            public TableCellEditor getCellEditor(int row, int column) {
                int modelColumn = convertColumnIndexToModel(column);

                if (modelColumn == 0) {
                    return editor;
                } else {
                    return super.getCellEditor(row, column);
                }
            }
        };

        JFrame frame = new JFrame("Table Cell Verify");
        frame.add(new JScrollPane(table));
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private InputVerifier getInputVerifier() {
        InputVerifier verifier = new InputVerifier() {

            @Override
            public boolean verify(JComponent input) {
                JTextField field = (JTextField) input;
                String text = field.getText();
                return text.matches(IP_REGEX) || text.isEmpty();
            }

            @Override
            public boolean shouldYieldFocus(JComponent input) {
                boolean valid = verify(input);
                if (!valid) {
                    JOptionPane.showMessageDialog(null, "Invalid IP address");
                }
                return valid;
            }

        };
        return verifier;
    }

    private DefaultCellEditor getTableCellEditor(final InputVerifier verifier) {
        DefaultCellEditor editor = new DefaultCellEditor(new JTextField()) {
            {
                getComponent().setInputVerifier(verifier);
            }

            @Override
            public boolean stopCellEditing() {
                if (!verifier.shouldYieldFocus(getComponent())) {
                    return false;
                }
                return super.stopCellEditing();
            }

            @Override
            public JTextField getComponent() {
                return (JTextField) super.getComponent();
            }

        };
        return editor;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TableVerifyInput();
            }
        });
    }
}