java - 如何在 JTable java 中搜索元素？

Question

我用java做了一个JTable。除了在我的表中搜索元素外，我可以做任何事情。我想使用一个输入对话框，所以这就是我现在所拥有的:

btnSearch = new JButton("Search");
    btnSearch.addActionListener(new ActionListener() 
    {
        public void actionPerformed(ActionEvent e) 
        {    
            String name = JOptionPane.showInputDialog("Wat wil je zoeken?");
        }
    });
    add(btnSearch);

我想用 for 循环来做。但我不知道怎么办。有人可以帮我吗？

Answer 1

您可能想使用 RowFilter 来过滤搜索结果。下面是一个使用 RowFilter 和 DocumentListener 的示例。当用户输入时，行被动态过滤。

参见 RowFilter API 和 DocumentListener接口(interface)。如果你不喜欢动态过滤，你可以坚持使用按钮，或者你可以添加一个 ActionListener 到 JTextField，所以当 Enter 被按下，过滤器将处理。您将放入监听器回调 (actionPerformed) 的代码将是

  String text = jtfFilter.getText();
  if (text.trim().length() == 0) {
     rowSorter.setRowFilter(null);
  } else {
     rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));
  }

import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.RowFilter;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

public class TestTableSortFilter extends JPanel {

    private String[] columnNames
            = {"Country", "Capital", "Population in Millions", "Democracy"};

    private Object[][] data = {
        {"USA", "Washington DC", 280, true},
        {"Canada", "Ottawa", 32, true},
        {"United Kingdom", "London", 60, true},
        {"Germany", "Berlin", 83, true},
        {"France", "Paris", 60, true},
        {"Norway", "Oslo", 4.5, true},
        {"India", "New Delhi", 1046, true}
    };

    private DefaultTableModel model = new DefaultTableModel(data, columnNames);
    private JTable jTable = new JTable(model);

    private TableRowSorter<TableModel> rowSorter
            = new TableRowSorter<>(jTable.getModel());

    private JTextField jtfFilter = new JTextField();
    private JButton jbtFilter = new JButton("Filter");

    public TestTableSortFilter() {
        jTable.setRowSorter(rowSorter);

        JPanel panel = new JPanel(new BorderLayout());
        panel.add(new JLabel("Specify a word to match:"),
                BorderLayout.WEST);
        panel.add(jtfFilter, BorderLayout.CENTER);

        setLayout(new BorderLayout());
        add(panel, BorderLayout.SOUTH);
        add(new JScrollPane(jTable), BorderLayout.CENTER);

        jtfFilter.getDocument().addDocumentListener(new DocumentListener(){

            @Override
            public void insertUpdate(DocumentEvent e) {
                String text = jtfFilter.getText();

                if (text.trim().length() == 0) {
                    rowSorter.setRowFilter(null);
                } else {
                    rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));
                }
            }

            @Override
            public void removeUpdate(DocumentEvent e) {
                String text = jtfFilter.getText();

                if (text.trim().length() == 0) {
                    rowSorter.setRowFilter(null);
                } else {
                    rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));
                }
            }

            @Override
            public void changedUpdate(DocumentEvent e) {
                throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
            }

        });
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
               JFrame frame = new JFrame("Row Filter");
               frame.add(new TestTableSortFilter());
               frame.pack();
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setLocationRelativeTo(null);
               frame.setVisible(true);
            }

        });
    }
}