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分享java怎样在表格中添加按钮？？
我想在表格中的每一行的最后一列都添加按钮，在点击某一行的按钮后删除那一行的信息（我的数据来自于数据库，用了TableModel表模型)求源代码加注释，谢谢！！！
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Daniel Mao 2013-08-25
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代码2中的第124行的DEBUG在哪里，if(DEBUG){}又是什么意思？
evangelionxb 2013-08-19
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public class MyButtonRender implements TableCellRenderer
{
private JPanel panel;
private JButton button;
public MyButtonRender()
{
this.initButton();
this.initPanel();
// 添加按钮。
this.panel.add(this.button);
}
private void initButton()
{
this.button = new JButton("编辑");
// 设置按钮的大小及位置。
this.button.setBounds(0, 0, 50, 15);
// 在渲染器里边添加按钮的事件是不会触发的
// this.button.addActionListener(new ActionListener()
// {
//
// public void actionPerformed(ActionEvent e)
// {
// // TODO Auto-generated method stub
// }
// });
}
private void initPanel()
{
this.panel = new JPanel();
// panel使用绝对定位，这样button就不会充满整个单元格。
this.panel.setLayout(null);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
int column)
{
// 只为按钮赋值即可。也可以作其它操作，如绘背景等。
this.button.setText(value == null ? "" : String.valueOf(value));
return this.panel;
}
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
public final Object[] longValues = {"Jane", "Kathy",
"None of the above",
new Integer(20), Boolean.TRUE};
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col == 10) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
}
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
}
}
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
}
System.out.println();
}
System.out.println("--------------------------");
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("TableRenderDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
TableRenderDemo newContentPane = new TableRenderDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
evangelionxb 2013-08-19
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public class TableRenderDemo extends JPanel {
private boolean DEBUG = false;
public TableRenderDemo() {
super(new GridLayout(1,0));
JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Set up column sizes.
initColumnSizes(table);
//Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table, table.getColumnModel().getColumn(2));
//Add the scroll pane to this panel.
add(scrollPane);
}
/*
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidthToFit().
*/
private void initColumnSizes(JTable table) {
MyTableModel model = (MyTableModel)table.getModel();
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValues;
TableCellRenderer headerRenderer =
table.getTableHeader().getDefaultRenderer();
for (int i = 0; i < 5; i++) {
column = table.getColumnModel().getColumn(i);
comp = headerRenderer.getTableCellRendererComponent(
null, column.getHeaderValue(),
false, false, 0, 0);
headerWidth = comp.getPreferredSize().width;
comp = table.getDefaultRenderer(model.getColumnClass(i)).
getTableCellRendererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferredSize().width;
if (DEBUG) {
System.out.println("Initializing width of column "
+ i + ". "
+ "headerWidth = " + headerWidth
+ "; cellWidth = " + cellWidth);
}
column.setPreferredWidth(Math.max(headerWidth, cellWidth));
}
}
public void setUpSportColumn(JTable table,
TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");
// sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
// DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
// renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(new MyButtonRender());
sportColumn.setCellEditor(new MyButtonEditor());
}
/**
* 自定义一个往列里边添加按钮的单元格编辑器。最好继承DefaultCellEditor，不然要实现的方法就太多了。
*
*/
public class MyButtonEditor extends DefaultCellEditor
{
/**
* serialVersionUID
*/
private static final long serialVersionUID = -6546334664166791132L;
private JPanel panel;
private JButton button;
public MyButtonEditor()
{
// DefautlCellEditor有此构造器，需要传入一个，但这个不会使用到，直接new一个即可。
super(new JTextField());
// 设置点击几次激活编辑。
this.setClickCountToStart(1);
this.initButton();
this.initPanel();
// 添加按钮。
this.panel.add(this.button);
}
private void initButton()
{
this.button = new JButton("编辑");
// 设置按钮的大小及位置。
this.button.setBounds(0, 0, 50, 15);
// 为按钮添加事件。这里只能添加ActionListner事件，Mouse事件无效。
this.button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
// 触发取消编辑的事件，不会调用tableModel的setValue方法。
MyButtonEditor.this.fireEditingCanceled();
JOptionPane.showMessageDialog(null,"Eggs are not supposed to be green.");
// 这里可以做其它操作。
// 可以将table传入，通过getSelectedRow,getSelectColumn方法获取到当前选择的行和列及其它操作等。
}
});
}
private void initPanel()
{
this.panel = new JPanel();
// panel使用绝对定位，这样button就不会充满整个单元格。
this.panel.setLayout(null);
}
/**
* 这里重写父类的编辑方法，返回一个JPanel对象即可（也可以直接返回一个Button对象，但是那样会填充满整个单元格）
*/
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)
{
// 只为按钮赋值即可。也可以作其它操作。
this.button.setText(value == null ? "" : String.valueOf(value));
return this.panel;
}
/**
* 重写编辑单元格时获取的值。如果不重写，这里可能会为按钮设置错误的值。
*/
@Override
public Object getCellEditorValue()
{
return this.button.getText();
}
}
