java 实现在文本域读取信息并据此在文件中遍历查询，同时显示在jtable表格中，若未查询到则弹出查询失败对话框代码实现

以下是一个简单的 Java 代码示例，实现了在文本域中读取信息并在文件中遍历查询，如果查询成功则将结果显示在 JTable 表格中，否则弹出查询失败对话框：

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;
import javax.swing.table.DefaultTableModel;

public class FileSearchDemo {

    private JFrame frame;
    private JTextArea textArea;
    private JTable table;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    FileSearchDemo window = new FileSearchDemo();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public FileSearchDemo() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.getContentPane().add(panel, BorderLayout.NORTH);

        JLabel lblNewLabel = new JLabel("Enter keyword:");
        panel.add(lblNewLabel);

        textArea = new JTextArea();
        panel.add(textArea);

        JButton btnNewButton = new JButton("Search");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                search();
            }
        });
        panel.add(btnNewButton);

        JScrollPane scrollPane = new JScrollPane();
        frame.getContentPane().add(scrollPane, BorderLayout.CENTER);

        table = new JTable();
        table.setModel(new DefaultTableModel(
            new Object[][] {},
            new String[] {"File", "Line", "Text"}
        ));
        scrollPane.setViewportView(table);
    }

    private void search() {
        String keyword = textArea.getText();
        List<String[]> results = new ArrayList<String[]>();
        try {
            BufferedReader reader = new BufferedReader(new FileReader("data.txt"));
            String line;
            int lineNumber = 0;
            while ((line = reader.readLine()) != null) {
                lineNumber++;
                if (line.contains(keyword)) {
                    String[] result = new String[3];
                    result[0] = "data.txt";
                    result[1] = Integer.toString(lineNumber);
                    result[2] = line;
                    results.add(result);
                }
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (results.size() == 0) {
            JOptionPane.showMessageDialog(frame, "No results found.");
        } else {
            DefaultTableModel model = (DefaultTableModel) table.getModel();
            model.setRowCount(0);
            for (String[] result : results) {
                model.addRow(result);
            }
        }
    }

}

这个示例程序包括一个窗口，其中包含一个文本域、一个搜索按钮和一个 JTable 表格。当用户在文本域中输入关键字并点击搜索按钮时，程序会在文件 "data.txt" 中查找包含该关键字的行，并将结果显示在表格中。如果未找到任何结果，则会弹出查询失败对话框。