Jtable不刷新/更新数据

Question

我有JTable/ 的问题JScrollPane.我的数据表没有刷新/更新.我正在使用DefultTableModel并根据代码一切正常,我没有任何错误.此外,我有一个分页表,这就是为什么我使用动作监听器和按钮"prev"和"next".我从其他函数传递给在类中编码的函数 JTable.问题是我填充了包含表数据的数组,但表不会更新/刷新它.这是我的代码.谢谢你.

BIG EDIT旧代码已被删除.我添加了新的代码,可以帮助你们/女孩了解我的问题.希望这会有所帮助.问候.

这里首先是显示gui的类:

import javax.swing.*;
public class Glavni {
public static void main(String[] args)  {
    // TODO Auto-generated method stub
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
                gui Scanner = new gui();
                Scanner.setVisible(true);
        }
    });
}

}

第二个是将String传递给包含jtable的gui类的类

public class passDatatoTable {
public void passData(){
    String str1,str2,str3,str4;
    gui SendStringsToGUI = new gui();
    for (int i =0;i<=10;i++){
            str1="Column 1 of row: "+i;
            str2="Column 2 of row: "+i;
            str3="Column 3 of row: "+i;
            str4="Column 4 of row: "+i;
            SendStringsToGUI.WriteMonitorData(str1, str2, str3, str4);

    }
  }
}

接下来是gui(con​​tructor)的声明:

import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class gui extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
 String[][] data = new String[100][4];

 String[] columnNames = new String[]{
         "IP", "PC_NAME", "ttl", "db"
 };
 DefaultTableModel model = new DefaultTableModel(data,columnNames);


    JTable table =  new JTable(model);
    JScrollPane scrollPane = new JScrollPane(table);
    int i=0;
public void WriteMonitorData (String IP, String PC_NAME, String ttl, String gw)
{
    System.out.println(IP);//just for testing (check if data was passed)
    model.setValueAt(IP, i, 0);
    model.setValueAt(PC_NAME, i, 1);
    model.setValueAt(ttl, i, 2);
    model.setValueAt(gw, i, 3);

    i++;
    model.fireTableDataChanged();
    table.repaint();
    scrollPane.repaint();

}   
gui(){

JButton addData= new JButton("Add Data");
JButton next = new JButton("next");
JButton prev = new JButton("prev");
addData.addActionListener(this);
next.addActionListener(this);
prev.addActionListener(this);
JPanel panel = new JPanel(new BorderLayout());
JPanel buttonPanel = new JPanel();
buttonPanel.add(addData);
buttonPanel.add(prev);
buttonPanel.add(next);
panel.add(buttonPanel, BorderLayout.SOUTH);
panel.add(table.getTableHeader(), BorderLayout.PAGE_START);
panel.add(scrollPane, BorderLayout.CENTER);
getContentPane().add(panel);
}

这是actionListeners:

public void actionPerformed(ActionEvent e) {
if ("Add Data".equals(e.getActionCommand())){

        passDatatoTable passSomeData = new passDatatoTable();
        passSomeData.passData();
              }
 if ("next".equals(e.getActionCommand())) {
         Rectangle rect = scrollPane.getVisibleRect();
         JScrollBar  bar = scrollPane.getVerticalScrollBar();
         int blockIncr = scrollPane.getViewport().getViewRect().height;
             bar.setValue(bar.getValue() + blockIncr);
             scrollPane.scrollRectToVisible(rect);
     }
     if ("prev".equals(e.getActionCommand())) {
         Rectangle rect = scrollPane.getVisibleRect();
         JScrollBar  bar = scrollPane.getVerticalScrollBar();
         int blockIncr = scrollPane.getViewport().getViewRect().height;
             bar.setValue(bar.getValue() - blockIncr);
             scrollPane.scrollRectToVisible(rect);
     }

  }

Answer 1

你的第一个片段显示了这个:

JTable table = new JTable(model);

但是你的gui()构造函数显示:

JTable table = new JTable(data, columnNames);

你启动表两次.一旦使用了TableModel(JTable(TableModel tm)),下一个使用JTable(int rows,int cols)它并不好,JTable在构造函数中启动一次:

gui() {
DefaultTableModel model = new DefaultTableModel(data,columnNames);
JTable table =  new JTable(model);
JScrollPane scrollPane = new JScrollPane(table);

JButton next = new JButton("next");
JButton prev = new JButton("prev");
next.addActionListener(this);
prev.addActionListener(this);
JPanel panel = new JPanel(new BorderLayout());
JPanel buttonPanel = new JPanel();
buttonPanel.add(prev);
buttonPanel.add(next);
panel.add(buttonPanel, BorderLayout.SOUTH);
panel.add(table.getTableHeader(), BorderLayout.PAGE_START);
panel.add(scrollPane, BorderLayout.CENTER);
getContentPane().add(panel);
}

更新:

这是一个示例,它有一个线程,在UI可见后将启动2.5秒,并更改以下值JTable:

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class Test extends JFrame {

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new Test().createAndShowUI();
            }
        });

    }

    private void createAndShowUI() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        initComponents(frame);
        frame.pack();
        frame.setVisible(true);
        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    Thread.sleep(2500);
                } catch (InterruptedException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                } 
                SwingUtilities.invokeLater(new Runnable() {

                     @Override
                     public void run() {
                       model.setValueAt("hello", 0, 0);
                     }
                });
            }
        }).start();
    }
    static DefaultTableModel model;

    private void initComponents(JFrame frame) {

        String data[][] = {
            {"1", "2", "3"},
            {"4", "5", "6"},
            {"7", "8", "9"},
            {"10", "11", "12"}
        };

        String col[] = {"Col 1", "Col 2", "Col 3"};

        model = new DefaultTableModel(data, col);
        JTable table = new JTable(model);

        frame.getContentPane().add(new JScrollPane(table));
    }
}