Java JTable-仅显示与字符串匹配的行 [英] Java JTable - show rows only which matches the string

问题描述

我有一个JTable，其中填充了数据库中的数据.我添加了一个搜索功能，当在JTextField中键入数据时，如果单词与某些行匹配，则显示行.但是在您键入与任何行数据都不匹配的字符串或单词的那一刻，我要做的是隐藏所有行，而JTable仅显示列名.就像匹配IT时一样，仅显示那些具有用户键入的字符串并隐藏其他字符的行.

I have a JTable populated with data from a database. I have added a search function that display the rows, if word matched to some rows when the data is typed into a JTextField. But at the minute as you type a string or word that do not matches any of the rows data, what I want to do is to hide all the rows, and the JTable will show just the column names. Just like when something matches IT, shows those rows only which has the string that user typed and hide others.

这是我正在使用的代码:

Here is my code that I am using:

               if (text.length() == 0) {
                 sorter.setRowFilter(null);
               } else {
                 try {
                   sorter.setRowFilter(
                       RowFilter.regexFilter(text));
                 } catch (PatternSyntaxException pse) {
                   System.err.println("Bad regex pattern");
                 }
               }
             }

推荐答案

您要使用DocumentListener以及行过滤器.您可以看到如何编写DocumentListener .

You want to use a DocumentListener, along with the row filter. You can see how to Write a DocumentListener.

基本上，侦听器侦听文本字段的基础文档中的更改.从您在DocumentListener中覆盖的方法中，您可以像当前一样获取文本，并像当前一样设置regex ex过滤器

Basically the listener listens for changes in the underlying document of the text field. From the methods you override in the DocumentListener, you can get the text, like you're currently doing, and set the regex ex filter like you're currently doing

这是一个简单的示例(忽略小程序.我只是从

Here's simple example (disregard the applet. I just got the boilerplate code from this post and added the document listener). Note: that same post has an answer provided that will allow you to filter in a case-insensitive way, if you're looking for that functionality

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.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

public class TestTableSorterFilter 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 TestTableSorterFilter() {
        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.getDocument().addDocumentListener(new DocumentListener(){

            @Override
            public void changedUpdate(DocumentEvent arg0) {}

            @Override
            public void insertUpdate(DocumentEvent arg0) {
                String text = jtfFilter.getText();

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

            @Override
            public void removeUpdate(DocumentEvent arg0) {
                String text = jtfFilter.getText();
                if (text.trim().length() == 0) {
                    rowSorter.setRowFilter(null);
                } else {
                    rowSorter.setRowFilter(RowFilter.regexFilter(text));
                }   
            }
        });
    }
}

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