如何在JTable上执行不区分大小写的过滤器？

I am making a table with a text field below it where you can type in a word to filter the table. It works, but what I want to do is be able to filter it with the word typed in, but ignoring the case of the word. Is there a way to accomplish this without creating a custom RowFilter?

我正在制作一个带有文本字段的表格，您可以在其中输入单词来过滤表格。它有效，但我想要做的是能够用输入的单词过滤它，但忽略单词的情况。有没有办法在不创建自定义RowFilter的情况下完成此操作？

You can run this SCCEE to see what I'm talking about. I want to be able to type in usa and it'll filter USA.

您可以运行此SCCEE以查看我正在谈论的内容。我想能够输入美国，它将过滤美国。

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
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.table.TableModel;
import javax.swing.table.TableRowSorter;

public class TestTableSortFilter extends JApplet {

    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 JTable jTable = new JTable(data, columnNames);

    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);

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


        jtfFilter.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e) {
                String text = jtfFilter.getText();

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

Is there maybe something I can pass to the regexFilter(text), that will give me the desired result?

有没有什么我可以传递给regexFilter（文本），这会给我想要的结果？

rowSorter.setRowFilter(RowFilter.regexFilter(text));

2 个解决方案

#1

Add the standard regex case-insensitivity flag:

添加标准的正则表达式不区分大小写标志：

rowSorter.setRowFilter(RowFilter.regexFilter("(?i)" + text));

I've tested this with your SSCCE (thanks for providing that) and it works.

我用你的SSCCE测试了这个（感谢你提供的）并且它有效。

#2

rowSorter.setStringConverter(new TableStringConverter() {
        @Override
        public String toString(TableModel model, int row, int column) {
            return model.getValueAt(row, column).toString().toLowerCase();
        }
    });
rowSorter.setRowFilter(RowFilter.regexFilter(jtfFilter.getText().toLowerCase()));

#1