java中如何实现表格的多表头显示

首先声明，这些内容都是借鉴来的，稍微改动了一下。
主要就是三个应用类ColumnGroup， GroupableTableHeader，GroupableTableHeaderU
和一个示例类GroupableHeaderExample
1、ColumnGroup类主要负责多表头的构建
import java.awt.Component;
import java.awt.Dimension;
import java.util.Enumeration;
import java.util.Vector;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
public class ColumnGroup {
    protected TableCellRenderer renderer;
    protected Vector v;
    protected String text;
    protected int margin = 0;
    public ColumnGroup(String text) {
        this(null, text);
    }
    public ColumnGroup(TableCellRenderer renderer, String text) {
        if (renderer == null) {
            this.renderer = new DefaultTableCellRenderer() {
                public Component getTableCellRendererComponent(JTable table,
                        Object value, boolean isSelected, boolean hasFocus,
                        int row, int column) {
                    JTableHeader header = table.getTableHeader();
                    if (header != null) {

补充：Jsp教程,Java技巧及代码