我创建了一个包含 JTable 的简单 GUI。该表可以通过适当的对象流保存和加载。
此时，Save 函数按预期工作，在查看保存目录时，我可以看到表对象存储在文件中。
但是，当我尝试从文件加载表时，GUI 永远不会显示加载的表。调用 actionlistener 函数，因为我有一个 system.out “数据加载”，但表从不显示更新的数据。
我曾尝试调用 repaint()，但无济于事。对于任何能够阐明我可能做错了什么的人，我将不胜感激。
看一些代码
import javax.swing.*;
import java.awt.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.imageio.*;
import java.io.*;
import java.awt.image.BufferedImage;
import java.util.*;
import javax.swing.table.*;
import java.awt.event.*;
public class Save3 extends JFrame implements ActionListener{
public int PADDING = 10;
public JMenuItem menuNew;
public JMenuItem menuOpen;
public JMenuItem menuSave;
public JMenuItem menuExit;
public JPanel container;
public DefaultTableModel model;
public JScrollPane scrollPane;
public JTable table;
public FileInputStream fis;
public ObjectInputStream in;
public FileOutputStream fos;
public ObjectOutputStream out;
public String filename;
public Save3(){
fis = null;
in = null;
fos = null;
out = null;
filename = "test.ref";
initGUI();
}
public void initGUI(){
setTitle("WIM Reference Data Comparison Tool");
setSize(500, 400);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
// Menu Bar and Menu Items setup
JMenuBar menuBar;
JMenu menu;
JMenuItem menuItem;
menuBar = new JMenuBar();
menu = new JMenu("Menu");
menuBar.add(menu);
menuNew = new JMenuItem("New");
menuOpen = new JMenuItem("Open");
menuSave = new JMenuItem("Save");
menuExit = new JMenuItem("Exit");
menuNew.addActionListener(this);
menuOpen.addActionListener(this);
menuSave.addActionListener(this);
menuExit.addActionListener(this);
menu.add(menuNew);
menu.add(menuOpen);
menu.add(menuSave);
menu.add(menuExit);
setJMenuBar(menuBar);
container = new JPanel(new BorderLayout());
String[] columnNames = {"", "MotorBike", " Car"};
Object[][] data = { {"Vehicle Summary", new Integer(100), new Integer(200)}, // Header 1: Green
{"Axle Numbers", new Integer(100), new Integer(200)},
{"Axle Code", new Integer(100), new Integer(200)},
{"Axle Distances (cm)", new Integer(100), new Integer(200)},
{"Vehicle Speed (km/h)", new Integer(100), new Integer(200)},
{"Gross Weight", new Integer(100), new Integer(200)},
{"Axle Weight 1", new Integer(100), new Integer(200)},
{"Axle Weight 2", new Integer(100), new Integer(200)},
};
model = new DefaultTableModel(data, columnNames);
table = new JTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
scrollPane = new JScrollPane(table);
container.add(scrollPane, BorderLayout.CENTER);
add(container);
}
public void setPanel(JTable table){
scrollPane.remove(table);
container.remove(scrollPane);
scrollPane = new JScrollPane(table);
container.add(scrollPane, BorderLayout.CENTER);
repaint();
}
public void actionPerformed(ActionEvent e){
System.out.println("Clicked item!");
// NEW
if(e.getSource() == menuNew){
System.out.println("New File");
}
// SAVE
if(e.getSource() == menuSave){
System.out.println("Save!");
try{
model.fireTableDataChanged();
table = new JTable(model);
fos = new FileOutputStream(filename);
out = new ObjectOutputStream(fos);
out.writeObject(table);
}catch(IOException e3){
e3.printStackTrace();
}
}
if(e.getSource() == menuOpen){
System.out.println("Open!");
JTable table = new JTable();
try{
fis = new FileInputStream(filename);
in = new ObjectInputStream(fis);
table = new JTable();
table = (JTable) in.readObject();
in.close();
setPanel(table);
System.out.println("data loaded");
}catch(IOException e1){
e1.printStackTrace();
}catch(ClassNotFoundException e2){
e2.printStackTrace();
}
}
if(e.getSource() == menuExit){
System.out.println("Exit!");
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (Exception e) {
e.printStackTrace();
}
Save3 ex = new Save3();
ex.setVisible(true);
}
});
}
}