java读取文件前五行并保存

    public static void readFileTop5LineAndSave(String filePath ) {
        try {
            // 读取文件
            BufferedReader reader = new BufferedReader(new FileReader(filePath));

            // 前五行文本
            String text = "";
            for (int i = 0; i < 5; i++) {
                String line = reader.readLine();
                if (line != null) {
                    text += line + "\n";
                }
            }

            // 将文本复制到剪切板
            StringSelection selection = new StringSelection(text);
            Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
            clipboard.setContents(selection, null);

            // 保存文件
            BufferedWriter writer = new BufferedWriter(new FileWriter(filePath));
            String line;
            while ((line = reader.readLine()) != null) {
                writer.write(line);
                writer.newLine();
            }
            writer.close();
            reader.close();

//            JOptionPane.showMessageDialog(null, "前五行已剪切到剪贴板，并保存文件。");
        } catch (IOException ex) {
            JOptionPane.showMessageDialog(null, "文件读取或保存时出错");
        }
    }