1。写死数据的蠢办法
/// 一个显示姓名，性别和出生年月的表格,点击表格某行的时候会有两种事件发生 ///
package com.yinbodotcc.JTable;
/*
A网友说： repain()调用Component类的update()方法清除Component背景中以前的绘图， 然后update()在调用paint()。一般不要重载repaint()，有必要的话重载update()。
B网友说： repaint() -> update() -> paint() update() 一般都是有需要才被调用的。 通常应该重载 update() 和 paint() 而不是 repaint()。
我说： 我就喜欢看大家说，然后记录下来，哈哈
*/// 这里需要学会JTable事件处理， 以及为了线程安全，需要从事件分派线程出发来显示界面
import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTable;import java.awt.Dimension;import java.awt.GridLayout;
import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;
import javax.swing.ListSelectionModel;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;
public class SimpleTableDemo extends JPanel { private boolean DEBUG = false; private boolean ALLOW_ROW_SELECTION = true; //个人感觉列可以选择，用处不是很大，掌握行可以选择，及单独的单元可以选中比较重要 private boolean ALLOW_COLUMN_SELECTION = false;
public SimpleTableDemo() { super(new GridLayout(1,0));
//表格中数据填充 String[] columnNames = {"姓名","性别","出生年月","婚否"}; Object[][] data = { {"杨安印", "男", new Integer(19880206), new Boolean(false)}, {"吴义田", "男", new Integer(19890206), new Boolean(true)} }; final JTable table = new JTable(data, columnNames); table.setPreferredScrollableViewportSize(new Dimension(500, 70));
/// /// //点击表格体的事件 if (DEBUG) { table.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { printDebugData(table); } }); } table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); //点击表格某行的事件 if(ALLOW_ROW_SELECTION){ ListSelectionModel lsm=table.getSelectionModel(); lsm.addListSelectionListener(new ListSelectionListener(){ public void valueChanged(ListSelectionEvent e) { //这一句若没有，则点击另外一行时候，将 "...被选中"打印两次 if (e.getValueIsAdjusting()) return;
ListSelectionModel ls=(ListSelectionModel)e.getSource(); if(ls.isSelectionEmpty()) { System.out.println("什么也没有选中"); } else { int index=ls.getMinSelectionIndex(); System.out.println("行: "+index+" 被选中"); } } });
} else table.setRowSelectionAllowed(false); //点击表格某列的事件 if(ALLOW_COLUMN_SELECTION) { if (ALLOW_ROW_SELECTION) { //可以选择单独的单元 table.setCellSelectionEnabled(true); } table.setColumnSelectionAllowed(true); ListSelectionModel colSM =table.getColumnModel().getSelectionModel(); colSM.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (e.getValueIsAdjusting()) return;
ListSelectionModel lsm = (ListSelectionModel)e.getSource(); if (lsm.isSelectionEmpty()) { System.out.println("没有列被选中"); } else { int selectedCol = lsm.getMinSelectionIndex(); System.out.println("列 " + selectedCol + " 被选中"); } } });
} JScrollPane scrollPane = new JScrollPane(table); add(scrollPane); }
private void printDebugData(JTable table) { int numRows = table.getRowCount(); int numCols = table.getColumnCount(); javax.swing.table.TableModel model = table.getModel();
System.out.println("Value of data: "); for (int i=0; i < numRows; i++) { System.out.print(" row " + i + ":"); for (int j=0; j < numCols; j++) { System.out.print(" " + model.getValueAt(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() { JFrame frame = new JFrame("没有用DataModel的JTable例子"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SimpleTableDemo newContentPane = new SimpleTableDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane);
//调整此窗口的大小，以适合其子组件的首选大小和布局 frame.pack(); frame.setVisible(true); }
public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }}
缺点评价：A。所有行都能编辑，不一定好。B。要求是数组数据，但是如果数据是从数据库中获取，则不方便。C。所有数据都被作为String类型，非常不方便。所以我们需要更大的方便，请望下面看，我们会有进步的
2。 让表格某一行不被选中(网友提供的做法)///
class MyLSL implements ListSelectionListener { private final int notSelectableRow; public MyLSL( int notSelectableRow ) { this.notSelectableRow = notSelectableRow; } public void valueChanged( ListSelectionEvent e ) { if ( ! e.getValueIsAdjusting( ) && t.isRowSelected( notSelectableRow ) ) t.removeRowSelectionInterval( notSelectableRow, notSelectableRow ); } } 然后就可以： t.getSelectionModel( ).addListSelectionListener( new MyLSL( 1 ) ); 这里t是一个
3./// 自己定义数据模型，然后传给视图import javax.swing.JFrame;import javax.swing.table.AbstractTableModel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTable;import java.awt.Dimension;import java.awt.GridLayout;
import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;
import javax.swing.ListSelectionModel;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;看模型类：class MyTableModel extends AbstractTableModel{ //表格中数据填充 String[] columnNames = {"姓名","性别","出生年月","婚否"}; Object[][] data = { {"杨安印", "男", new Integer(19880206), new Boolean(false)}, {"吴义田", "男", new Integer(19890206), new Boolean(true)} }; public int getRowCount() { return data.length; } public int getColumnCount() { return columnNames.length; } public Object getValueAt(int row, int column) { return data[row][column]; } public Class<?> getColumnClass(int columnIndex) { return getValueAt(0, columnIndex).getClass(); } public String getColumnName(int column) { return columnNames[column]; } public void setValueAt(Object value, int row, int col) {//其实这个就包含了一定得事件处理性质 if (SimpleTableDemo.DEBUG) { System.out.println("设置第 " + row + "行,第" + col + "列得值为 " + value + " 它得类是 " + value.getClass()); }
data[row][col] = value; fireTableCellUpdated(row, col);//还需要更新
if (SimpleTableDemo.DEBUG) { System.out.println("新得数据是:"); printDebugData(); } } public boolean isCellEditable(int rowIndex,int columnIndex) { if(columnIndex<1) return false; else return true; } 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("--------------------------"); }}视图类：public class SimpleTableDemo extends JPanel { public static final boolean DEBUG = true; private boolean ALLOW_ROW_SELECTION = true; public SimpleTableDemo() { super(new GridLayout(1,0)); MyTableModel m=new MyTableModel(); final JTable table = new JTable(m); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); /// //点击表格体的事件 if (DEBUG) { table.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { printDebugData(table); } }); } table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); //点击表格某行的事件 if(ALLOW_ROW_SELECTION){ ListSelectionModel lsm=table.getSelectionModel(); lsm.addListSelectionListener(new ListSelectionListener(){ public void valueChanged(ListSelectionEvent e) { //这一句若没有，则点击另外一行时候，将 "...被选中"打印两次 if (e.getValueIsAdjusting()) return;
ListSelectionModel ls=(ListSelectionModel)e.getSource(); if(ls.isSelectionEmpty()) { System.out.println("什么也没有选中"); } else { int index=ls.getMinSelectionIndex(); System.out.println("行: "+index+" 被选中"); } } });
} else table.setRowSelectionAllowed(false); JScrollPane scrollPane = new JScrollPane(table); add(scrollPane); }
private void printDebugData(JTable table) { int numRows = table.getRowCount(); int numCols = table.getColumnCount(); javax.swing.table.TableModel model = table.getModel();
System.out.println("Value of data: "); for (int i=0; i < numRows; i++) { System.out.print(" row " + i + ":"); for (int j=0; j < numCols; j++) { System.out.print(" " + model.getValueAt(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() { JFrame frame = new JFrame("没有用DataModel的JTable例子"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SimpleTableDemo newContentPane = new SimpleTableDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane);
//调整此窗口的大小，以适合其子组件的首选大小和布局 frame.pack(); frame.setVisible(true); }
public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }}
