仅在JTable（Java）的第一列中显示导入的数据

Question

我试图制作一个简单的GUI，可以在其中添加一个人的名字/姓氏及其出生日期。将数据添加到JTable之后，我可以将其保存在TxT文件中，然后再次将其加载回JTable中。

保存数据的部分：

private void saveListener(){
    jb1.addActionListener(e -> {
        JFileChooser fileChooser = new JFileChooser();
        int returnVal = fileChooser.showSaveDialog(PeopleGUI.this);
        if (returnVal == JFileChooser.APPROVE_OPTION) {     // Datei Explorer
            try {
                File file = fileChooser.getSelectedFile();
                PrintWriter o = new PrintWriter(file); // o steht für Output

                for (int col = 0; col < peopleModel.getColumnCount(); col++) {
                    o.print(peopleModel.getColumnName(col) + ";");
                }

                o.println("");

                for (int row = 0; row < peopleModel.getRowCount(); row++) {
                    for (int col = 0; col < peopleModel.getColumnCount(); col++) {
                        o.println(peopleModel.getValueAt(row, col));
                    }
                }

                o.close();
                // Output in der Konsole
                System.out.println("Success!");
            } catch (IOException c) {
                c.printStackTrace();
            }
        }
    });
}

加载数据的部分：

public void loadListener() {
    jb2.addActionListener(e -> {
    final JFileChooser fileChooser = new JFileChooser();
    int response = fileChooser.showOpenDialog(PeopleGUI.this);
    if (response == JFileChooser.APPROVE_OPTION) {
        try {
            BufferedReader br = new BufferedReader(new FileReader("jlist.txt"));

            // Erste Linie sind Kolonnen Beschriftungen
            String firstLine = br.readLine().trim();
            String[] columnsName = firstLine.split(";");
            DefaultTableModel model = (DefaultTableModel) peopleList.getModel();
            model.setColumnIdentifiers(columnsName);

            // Daten vom TxT holen
            Object[] tableLines = br.lines().toArray();

            // Reihen mit Daten
            for (int i = 0; i < tableLines.length; i++) {
                String line = tableLines[i].toString().trim();
                String[] dataRow = line.split("/");
                model.addRow(dataRow);
                }
            }
            catch (IOException b) {
                b.printStackTrace();
            }
        }
    });
}

问题是，导入的数据仅显示在第一行：

This is how it looks right now

现在有人可以解决此问题吗？

提前感谢！

Answer 1

问题是如何将数据保存到文件中

for (int row = 0; row < peopleModel.getRowCount(); row++) {
    for (int col = 0; col < peopleModel.getColumnCount(); col++) {
        o.println(peopleModel.getValueAt(row, col));
    }
}

这里您将JTable的每个单元格保存在新行中。您想将每行保存为用/

分隔的新行

for (int row = 0; row < peopleModel.getRowCount(); row++) {
    String r = "";
    for (int col = 0; col < peopleModel.getColumnCount(); col++) {
        r += peopleModel.getValueAt(row, col);
        if (col < peopleModel.getColumnCount() - 1) {
            r += "/";
        }
    }
    o.println(r);
}

编辑：如@camickr所述，使用StringJoiner更好

for (int row = 0; row < peopleModel.getRowCount(); row++) {
    StringJoiner stringJoiner = new StringJoiner("/");
    for (int col = 0; col < peopleModel.getColumnCount(); col++) {
        stringJoiner.add(peopleModel.getValueAt(row, col).toString());
    }
    o.println(stringJoiner.toString());
}

Answer 2

.txt文件的内容看起来如何，可以提供屏幕截图吗？您正在“分割”第一行，请尝试以下操作：

try {
        BufferedReader br = new BufferedReader(new FileReader("jlist.txt"));
        DefaultTableModel model = (DefaultTableModel) peopleList.getModel();           
        Object[] tableLines = br.lines().toArray();

        for (int i = 0; i < tableLines.length; i++) {
            String line = tableLines[i].toString().trim();
            String[] dataRow = line.split("/");
            model.addRow(dataRow);
            }
        }
        catch (IOException b) {
            b.printStackTrace();
        }
    }