java - 如何将数据添加到在设计模式下创建的 JTable？

Question

我创建了一个初始 JFrame，其中包含一个包含三列的表，如下所示：

这个 JFrame 是在设计模式下创建的，所以现在在面板的构造函数中，我想加载一些数据，所以当用户选择打开这个 JFrame 时，数据就会被加载。

我的列数据类型是对象（通常“状态”用于表示共享状态的图像 - 活动或非活动），共享名称的字符串和连接到该共享的活动客户端数量的整数。

我的问题是，如何通过代码向 JTable 添加行？

Answer 1

以简化的方式（可以改进）：

class MyModel extends AbstractTableModel{

    private ArrayList<Register> list = new ArrayList<Register>();

    @Override
    public int getColumnCount() {
        return 3;
    }

    @Override
    public int getRowCount() {
        return list.size();
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Register r = list.get(rowIndex);
        switch (columnIndex) {
        case 0: return r.status; 
        case 1: return r.name;
        case 2: return r.clients; 
        }
            return null;
    }

    public void addRegister(String status, String name, String clients){
        list.add(new Register(status, name, clients));
        this.fireTableDataChanged();
    }

    class Register{
        String status;
        String name;
        String clients;

        public Register(String status, String name, String clients) {
            this.status = status;
            this.name = name;
            this.clients = clients;
        }
    }

}

然后，在面板的构造函数中：

MyTableModel mtm = new MyTableModel();
yourtable.setModel(mtm);

并添加一行：

mtm.addRegister("the status","the name","the client(s)");

编辑：

要更改列的标题名称：

TableColumn statusColumn = yourtable.getColumnModel().getColumn(0); 
statusColumn.setHeaderValue("Status");

Answer 2

• JTable有两个级别（如您发布的 printscreen）谈论视图，

• 有（隐藏的）XxxTableModel存储值，

• 在XxxTableModel你可以调用myTableModel#addRow

简单的例子

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

public class RemoveAddRows extends JFrame {

    private static final long serialVersionUID = 1L;
    private Object[] columnNames = {"Type", "Company", "Shares", "Price"};
    private Object[][] data = {
        {"Buy", "IBM", new Integer(1000), new Double(80.50)},
        {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)},
        {"Sell", "Apple", new Integer(3000), new Double(7.35)},
        {"Buy", "Nortel", new Integer(4000), new Double(20.00)}
    };
    private JTable table;
    private DefaultTableModel model;

    public RemoveAddRows() {

        model = new DefaultTableModel(data, columnNames) {

            private static final long serialVersionUID = 1L;

            @Override
            public Class getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        table = new JTable(model) {

            private static final long serialVersionUID = 1L;

            @Override
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Component c = super.prepareRenderer(renderer, row, column);
                int firstRow = 0;
                int lastRow = table.getRowCount() - 1;
                int width = 0;
                if (row == lastRow) {
                    ((JComponent) c).setBackground(Color.red);
                } else if (row == firstRow) {
                    ((JComponent) c).setBackground(Color.blue);
                } else {
                    ((JComponent) c).setBackground(table.getBackground());
                }
                /*if (!isRowSelected(row)) {
                String type = (String) getModel().getValueAt(row, 0);
                c.setBackground("Buy".equals(type) ? Color.GREEN : Color.YELLOW);
                }
                if (isRowSelected(row) && isColumnSelected(column)) {
                ((JComponent) c).setBorder(new LineBorder(Color.red));
                }*/
                return c;
            }
        };
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);
        JButton button1 = new JButton("Remove all rows");
        button1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                if (model.getRowCount() > 0) {
                    for (int i = model.getRowCount() - 1; i > -1; i--) {
                        model.removeRow(i);
                    }
                }
                System.out.println("model.getRowCount() --->" + model.getRowCount());
            }
        });
        JButton button2 = new JButton("Add new rows");
        button2.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                Object[] data0 = {"Buy", "IBM", new Integer(1000), new Double(80.50)};
                model.addRow(data0);
                Object[] data1 = {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)};
                model.addRow(data1);
                Object[] data2 = {"Sell", "Apple", new Integer(3000), new Double(7.35)};
                model.addRow(data2);
                Object[] data3 = {"Buy", "Nortel", new Integer(4000), new Double(20.00)};
                model.addRow(data3);
                System.out.println("model.getRowCount() --->" + model.getRowCount());
            }
        });
        JPanel southPanel = new JPanel();
        southPanel.add(button1);
        southPanel.add(button2);
        add(southPanel, BorderLayout.SOUTH);
    }

    public static void main(String[] args) {
        RemoveAddRows frame = new RemoveAddRows();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}