進行更改后如何保存JTable

Question

我想保存表中所做的更改，然后在我要加載它時，每次重新啟動該程序時都可以。 到目前為止，這是我的代碼（請注意，我一直在尋找答案，但我並不是Java的佼佼者）：

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;


public class Table2 extends JFrame implements ActionListener{


//String[] colomn = {"Name","Age","Gender"};
Object[][] data = {{"John","20","Male"}};
JTable table = new JTable(new DefaultTableModel(data, new Object[]{"Name", "Age","Gender"})){

    public Component prepareRenderer(TableCellRenderer r, int data, int col){ //gives a pattern to the table cells.
        Component c = super.prepareRenderer(r, data, col);

        if(data % 2 == 0){
            c.setBackground(Color.PINK);
        }
        else{
            c.setBackground(Color.LIGHT_GRAY);
        }
        return c;
    }

};


//JTable table = new JTable(data,colomn);

public Table2(){

    table.setPreferredScrollableViewportSize(new Dimension(300,200));
    table.setFillsViewportHeight(true);

    JScrollPane scrollpane = new JScrollPane(table);
    add(scrollpane);
}

public static void main(String[] args) {

    Table2 table = new Table2();
    table.setLayout(new FlowLayout());
    table.setVisible(true);
    table.setSize(400,300);
    table.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    table.setResizable(false);
    table.setTitle("Table Prictice on JFrame");
    //table.pack();

    JButton button = new JButton("Add");
    table.add(button);
    button.addActionListener(table);
}

public void actionPerformed(ActionEvent e) {

    DefaultTableModel model = (DefaultTableModel) table.getModel();
    model.addRow(new Object[]{"", "", ""});
    System.out.println("Action Performed!");
}

}

Answer 1

您可以使用ObjectOutputStream將數據數組保存到二進制文件中，然后從那里讀取它。 要保存，您可以使用以下方法：

ObjectOutputStream outstream = new ObjectOutputStream(new FileOutputStream("filename"));
        outstream.writeObject(data);
        outstream.close();

要閱讀，您可以使用：

ObjectInputStream instream = new ObjectInputStream(newFileInputStream("filename"));
        Object[][] data = (Object[][]) instream.readObject();
        instream.close();

要獲取更改的數據，請查看如何將JTable數據作為數組檢索