java swing Jtable 合并单元格

在Java Swing中，可以使用JTable实现表格的展示和操作。JTable提供了一些方法可以用来合并单元格。 下面是一个简单的示例代码，演示如何使用JTable合并单元格： ```java import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ListSelectionModel; import javax.swing.UIManager; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; import javax.swing.table.JTableHeader; public class JTableMergeCellDemo extends JFrame { private static final long serialVersionUID = 1L; private JPanel contentPane; private JTable table; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { JTableMergeCellDemo frame = new JTableMergeCellDemo(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public JTableMergeCellDemo() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(UIManager.getBorder("ScrollPane.border")); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); JScrollPane scrollPane = new JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); String[] columnNames = {"姓名", "性别", "年龄", "爱好", "备注"}; Object[][] rowData = {{"张三", "男", 18, "篮球", "小张"}, {"李四", "女", 20, "足球", "小李"}, {"王五", "男", 22, "乒乓球", "小王"}, {"赵六", "女", 24, "羽毛球", "小赵"}, {"钱七", "男", 26, "游泳", "小钱"}, {"孙八", "女", 28, "跑步", "小孙"}, {"周九", "男", 30, "健身", "小周"}, {"吴十", "女", 32, "瑜伽", "小吴"}}; DefaultTableModel model = new DefaultTableModel(rowData, columnNames); table = new JTable(model); table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); table.setRowHeight(30); table.setPreferredScrollableViewportSize(new Dimension(400, 180)); table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); JTableHeader header = table.getTableHeader(); header.setPreferredSize(new Dimension(header.getWidth(), 30)); header.setDefaultRenderer(new MergeHeaderCellRenderer()); // 合并单元格 MergeCellUtil.mergeCells(table, new int[]{0, 1}, new int[]{2, 3, 4}); scrollPane.setViewportView(table); JPanel panel = new JPanel(); contentPane.add(panel, BorderLayout.SOUTH); JButton btnNewButton = new JButton("获取选中行"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); if (row != -1) { String name = (String) table.getValueAt(row, 0); JOptionPane.showMessageDialog(null, "选中的行为：" + name); } } }); panel.add(btnNewButton); } /** * 表头合并单元格的渲染器 */ private class MergeHeaderCellRenderer extends DefaultTableCellRenderer { private static final long serialVersionUID = 1L; @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); setHorizontalAlignment(CENTER); setBackground(Color.LIGHT_GRAY); return this; } } } ``` 在这个示例中，我们使用了一个名为MergeCellUtil的工具类，其中包含了一个mergeCells方法，可以用来合并单元格。这个方法的实现如下： ```java public class MergeCellUtil { /** * 合并单元格 * * @param table JTable对象 * @param rows 要合并的行数组 * @param cols 要合并的列数组 */ public static void mergeCells(JTable table, int[] rows, int[] cols) { DefaultTableModel model = (DefaultTableModel) table.getModel(); for (int i = 0; i < rows.length; i++) { int row = rows[i]; for (int j = 1; j < cols.length; j++) { int col = cols[j]; model.setValueAt("", row, col); table.getCellRenderer(row, col); } int width = 0; for (int j = 0; j < cols.length; j++) { int col = cols[j]; TableColumn column = table.getColumnModel().getColumn(col); width += column.getPreferredWidth(); } TableColumn column = table.getColumnModel().getColumn(cols[0]); column.setPreferredWidth(width); } } } ``` 通过这个工具类，我们可以传入要合并的行和列的数组，然后在表格中实现单元格的合并。 需要注意的是，表格中的单元格合并只是外观上的合并，并不会改变单元格的数据。如果需要获取合并后的单元格数据，需要自行编写相关的代码来实现。