java JTable设置多行表头

import javax.swing.*;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.JTableHeader;
import java.awt.*;/************************************************************
 * 
 *  * @author 邓洪书
 *  */
public class StoreTable extends JTable {
public StoreTable() { 
super(0, 13);  
this.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
this.getTableHeader().setUI(new UI()); 
} 
// 表头绘制器*********************************************************************
private class UI extends BasicTableHeaderUI { 
private JTableHeader header; 
public void paint(Graphics g, JComponent c) {
header = (JTableHeader) c;  
getTableHeader().setPreferredSize(new Dimension(StoreTable.this.getWidth(), 45));// 设置表头大小。横坐标必须足够大，  
//否则会出现绘制不完全以及闪烁现象    
//分类  
JLabel label=getLabel("分类"); 
rendererPane.paintComponent(g, label, header, 0, 0, getWidth(0), 45, true);  
//到货日期  
label=getLabel("到货日期");  
rendererPane.paintComponent(g, label, header, getX(1), 0, getWidth(1), 45, true);  
//送货日期   label=getLabel("送货日期"); 
rendererPane.paintComponent(g, label, header, getX(2), 0, getWidth(2), 45, true); 
//收款代理   label=getLabel("收款代理");  
rendererPane.paintComponent(g, label, header, getX(3), 0, getWidth(3), 45, true); 
//客户**************************************************************************  
label=getLabel("客户"); 
rendererPane.paintComponent(g, label, header, getX(4), 0, getWidth(4)+getWidth(5), 30, true); 
label=getLabel("上游"); 
rendererPane.paintComponent(g, label, header, getX(4), 30, getWidth(4), 15, true); 
label=getLabel("下游");  
rendererPane.paintComponent(g, label, header, getX(5), 30, getWidth(5), 15, true); 
//报关单号**********************************************************************  
label=getLabel("报关单号"); 
rendererPane.paintComponent(g, label, header, getX(6), 0, getX(10)-getX(6), 15, true);  
label=getLabel("上游"); 
rendererPane.paintComponent(g, label, header, getX(6), 15, getWidth(6)+getWidth(7), 15, true);
label=getLabel("下游"); 
rendererPane.paintComponent(g, label, header, getX(8), 15, getWidth(8)+getWidth(9), 15, true);
label=getLabel("进口"); 
rendererPane.paintComponent(g, label, header, getX(6), 30, getWidth(6), 15, true);  
label=getLabel("出口"); 
rendererPane.paintComponent(g, label, header, getX(7), 30, getWidth(7), 15, true);  
label=getLabel("进口"); 
rendererPane.paintComponent(g, label, header, getX(8), 30, getWidth(8), 15, true); 
label=getLabel("出口"); 
rendererPane.paintComponent(g, label, header, getX(9), 30, getWidth(9), 15, true); 
//业务员  
label=getLabel("业务员"); 
rendererPane.paintComponent(g, label, header, getX(10), 0, getWidth(10), 45, true); 
//操作员
label=getLabel("操作员"); 
rendererPane.paintComponent(g, label, header, getX(11), 0, getWidth(11), 45, true); 
//审核人   label=getLabel("审核人"); 
rendererPane.paintComponent(g, label, header, getX(12), 0, getWidth(12), 45, true); 
}  
// 得到指定列的起始坐标 
private int getX(int column)
{    int x=0;  
for(int i=0;i x+=header.getColumnModel().getColumn(i).getWidth();  
return x;  
}  
//得到指定列的宽度
private int getWidth(int column)
{   
return header.getColumnModel().getColumn(column).getWidth(); 
}  
//得到具有指定文本的标签 
private JLabel getLabel(String text)
{   JLabel label = new JLabel(text, JLabel.CENTER); 
    label.setFont(new Font("Dialog",   Font.PLAIN,   12));
label.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return label; 
}
}
public static void main(String[] args)
{  
JFrame frame=new JFrame(); 
frame.setSize(800,300);  frame.setDefaultCloseOperation(3);
frame.getContentPane().add(new JScrollPane(new StoreTable())); 
     frame.setVisible(true);
     }
}