关于DefaultTableModel的用法

本文详细介绍如何在Java Swing中使用JTable组件显示数据。通过创建DefaultTableModel实例,设置列名,添加数据行,并将模型应用到JTable,最终实现在Swing应用程序中展示表格数据。同时,文章提供了完整的代码示例。

要显示JTable组件(需要用到)TableModel接口(需要下面这个类才能实现)DefaultTableModel类

所以思路应该是: 1,先定义一个DefaultTableModel类的对象mm   DefaultTableModel mm = new DefaultTableModel();
2,替换该对象的列  mm.setColumnIdentifiers(columnNames);
3,把该对象mm加入到table里  JTable table = new JTable(mm);

(建议使用这种方法,这种方法可以添加一些控制Jtable行列和单元格的一些属性,详见上条博文)


//或者可以用这句实现table的显示  ((DefaultTableModel)table.getModel()).setColumnIdentifiers(columnNames);
public class JTableTest1 extends JFrame{

 //private Table_Model model = null;
 private JTable table;

 public JTableTest1() {
  //列名,用数组存储
  String[] columnNames = {"列名1","列名2","列名3"};
  //定义一个Vector数组(Vector各个元素由Vector组成,即数组的“二维存储”)
  Vector v = new Vector(3);
  v.add(0,"周杰伦");
  v.add(1,"蔡依林");
  v.add(2,"费玉清");
  //定义一个DefaultTableModel类,来实现TableModel接口
  DefaultTableModel newtablemodel = new DefaultTableModel();
  //用setColumnIdentifiers替换列(或者说设置列名)
  newtablemodel.setColumnIdentifiers(columnNames);
  //将vector添加到DefaultTableModel中,用addRow()方法,这是添加行数据到表格中的方法
  mm.addRow(v);

  
  JTable table = new JTable(newtablemodel);
  //table的getModel()方法返回实现这个table的TableModel类
  //需要把table加入到滑动按钮中才能显示
 
  
  JScrollPane sc = new JScrollPane(table);
  add(new JLabel("                            JTableTest1"),BorderLayout.NORTH);
  add(sc,BorderLayout.CENTER);
     setVisible(true);
     setBounds(100,100,400,300);
 }


 public static void main(String[] args) {
  JTableTest1 jtt=new JTableTest1();

 }

}
 

使用 AbstractTableModel 构建Table 在表格中添加JButton按钮,之前在网上找了2天没有找到好用的程序,最终终于找到一个好用的例子。 不要使,我退你们分。。 sing the Swing JTable class can quickly become a sticky business when you want to customize it to your specific needs. First you must become familiar with how the JTable class is organized. Individual cells are rendered by TableCellRenderer implementations. The table contents are represented by an implementation of the TableModel interface. By default, JTable uses DefaultTableCellRenderer to draw its cells. DefaultTableCellRenderer recognizes a few primitive types, rendering them as strings, and can even display Boolean types as checkboxes. But it defaults to displaying the value returned by toString() for types it does not specifically handle. You have to provide your own TableCellRenderer implementation if you want to display buttons in a JTable. The TableCellRenderer interface contains only one method, getTableCellRendererComponent(...), which returns a java.awt.Component that knows how to draw the contents of a specific cell. Usually, getTableCellRendererComponent() will return the same component for every cell of a column, to avoid the unnecessary use of extra memory. But when the contents of a cell is itself a component, it is all right to return that component as the renderer. Therefore, the first step towards having JButtons display correctly in a JTable is to create a TableCellRenderer implementation that returns the JButton contained in the cell being rendered. In the accompanying code listing, JTableButtonRenderer demonstrates how to do this. Even after creating a custom TableCellRenderer, you're still not done. The TableModel associated with a given JTable does not only keep track of the contents of each cell, but it also keeps track of the class of data stored in each column. DefaultTableModel is designed to work with DefaultTableCellRenderer and will return java.lang.String.class for columns containing data types that it does not specifically handle. The exact method that does this is getColumnClass(int column). Your second step is to create a TableModel implementation that returns JButton.class for cells that contain JButtons. JTableButtonModel shows one way to do this. It just returns the result of getClass() for each piece of cell data. At this point, you're almost done, but not quite. What's the use of putting a JButton in a JTable if you can't press the darn thing? By default, JTable will not forward mouse events to components contained in its cells. If you want to be able to press the buttons you add to JTable, you have to create your own MouseListener that forwards events to the JButton cells. JTableButtonMouseListener demonstrates how you could do this.
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