简单实现JTable增删改-继承自JFrame，实现了ActionListener 接口
本public类继承自JFrame，实现了ActionListener 接口。
简单实现JTable的增删改：
1 import javax.swing.*; 2 import javax.swing.event.TableModelEvent; 3 import javax.swing.event.TableModelListener; 4 import javax.swing.table.DefaultTableCellRenderer; 5 import javax.swing.table.DefaultTableColumnModel; 6 import javax.swing.table.DefaultTableModel; 7 import java.awt.*; 8 import java.awt.event.ActionEvent; 9 import java.awt.event.ActionListener; 10 import java.awt.event.MouseAdapter; 11 import java.awt.event.MouseEvent; 12 13 public class TableDemo extends JFrame implements ActionListener { 14 //操作面板，存放增删改按钮 15 private JPanel controlPanel; 16 //定义表格的数据模型 17 private DefaultTableModel model; 18 //定义一个表格 19 private JTable table; 20 //定义一个滚动面板，用来放置表格 21 private JScrollPane scrollPane; 22 //增删改按钮 23 private JButton addBtn, deleteBtn, updateBtn; 24 25 public TableDemo() throws HeadlessException { 26 //表头 27 String[] head={"学号","姓名","成绩"}; 28 //初始化数据 29 Object[][] datas = new String[][] { 30 {"101","Jason","617"}, 31 {"102","Nick","609"}, 32 {"103","William","599"}, 33 {"104","Charles","588"} }; 34 //初始化表格数据模型 35 model = new DefaultTableModel(datas, head); 36 //用表格模型初始化表格 37 table = new JTable(model); 38 //初始化滚动面板 39 scrollPane = new JScrollPane(table); 40 //初始化按钮 41 addBtn = new JButton("增加"); 42 deleteBtn = new JButton("删除"); 43 updateBtn = new JButton("修改"); 44 //给按钮添加监听事件 45 addBtn.addActionListener(this); 46 deleteBtn.addActionListener(this); 47 updateBtn.addActionListener(this); 48 //初始化控制面板，添加相关按钮 49 controlPanel = new JPanel(); 50 controlPanel.add(addBtn); 51 controlPanel.add(deleteBtn); 52 controlPanel.add(updateBtn); 53 //设置面板布局，上面控制按钮，中间放表格列表 54 add(controlPanel, BorderLayout.NORTH); 55 add(scrollPane, BorderLayout.CENTER); 56 //设置表格中的对齐方式 57 DefaultTableCellRenderer renderer = new DefaultTableCellRenderer(); 58 renderer.setHorizontalAlignment(SwingConstants.CENTER); 59 //通过列名获取表格的列对象，并将上面设好对齐方式应用到指定列上 60 table.getColumn("学号").setCellRenderer(renderer); 61 table.getColumn("姓名").setCellRenderer(renderer); 62 63 //设置表格宽度，以及拖动的最大和最小宽度 64 DefaultTableColumnModel dcm = (DefaultTableColumnModel)table.getColumnModel(); 65 dcm.getColumn(0).setPreferredWidth(60); 66 dcm.getColumn(0).setMinWidth(45); 67 dcm.getColumn(0).setMaxWidth(75); 68 //设置行高 69 //table.setRowHeight(25); 70 71 //加上鼠标监听事件 72 table.addMouseListener(new MouseAdapter() { 73 @Override 74 public void mouseClicked(MouseEvent e) { 75 int row = table.getSelectedRow(); 76 int col = table.getSelectedColumn(); 77 System.out.println("选中的=>" + table.getValueAt(row, col)); 78 } 79 }); 80 //加上表格数据模型监听事件 81 table.getModel().addTableModelListener(new TableModelListener() { 82 @Override 83 public void tableChanged(TableModelEvent e) { 84 System.out.println("表格模型事件e=>" + e); 85 if (e.getType() == TableModelEvent.UPDATE){ 86 int row = table.getSelectedRow(); 87 int col = table.getSelectedColumn(); 88 System.out.println("修改后=>" + table.getValueAt(row, col)); 89 } 90 } 91 }); 92 //允许点击JTable的表头进行升降排序 93 table.setAutoCreateRowSorter(true); 94 95 //setBounds(100,100,600,400); 96 setSize(600,400); 97 //居中显示窗口 98 setLocationRelativeTo(null); 99 setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 100 //设为可见，后面弹出对话框窗口时，可能需要放到别的函数里 101 setVisible(true); 102 } 103 104 @Override 105 public void actionPerformed(ActionEvent e) { 106 if (e.getSource() == addBtn){ 107 model.addRow(new Object[]{"105","Martin","603"}); 108 } 109 else if(e.getSource() == deleteBtn){ 110 int i = table.getSelectedRow(); 111 if (i == -1) { 112 JOptionPane.showMessageDialog(this, "请选中一条记录"); 113 return; 114 } 115 model.removeRow(i); 116 } 117 else if (e.getSource() == updateBtn){ 118 int row = table.getSelectedRow(); 119 if (row == -1){ 120 JOptionPane.showMessageDialog(this,"请选中一条记录"); 121 return; 122 } 123 //自己闹着玩的，给表格中的第3列分数自动修改加1 124 int newValue = Integer.parseInt( model.getValueAt(row, 2).toString() ) + 1; 125 model.setValueAt(Integer.toString(newValue) , row, 2); 126 } 127 } 128 129 public static void main(String[] args) { 130 new TableDemo(); 131 } 132 }
结束。
