Question

我想保存在表格中进行的更改，然后当我想加载它时，每次重新启动程序时都会发生错误。这是我到目前为止的代码（请注意，我已经找到了答案，但我不是最好的java）：

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将数据数组保存到二进制文件中，然后可以从那里读取它。为了节省您可以使用以下内容：

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

要阅读，您可以使用：

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

要获取更改的数据，请查看How to Retrieve JTable Data as an Array

如何在更改后保存JTable

1 个答案: