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) {
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
}
setHorizontalAlignment(JLabel.CENTER);
this.setText((value == null) ? "" : value.toString());
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
};
} else {
this.renderer = renderer;
}
this.text = text;
v = new Vector();
}
/**
* @param obj
* TableColumn or ColumnGroup
*/
public void add(Object obj) {
if (obj == null) {
return;
}
v.addElement(obj);
}
/**
* @param c
* TableColumn
* @param v
* ColumnGroups
*/
public Vector getColumnGroups(TableColumn c, Vector g) {
g.addElement(this);
if (v.contains(c))
return g;
Enumeration enumeration = v.elements();
while (enumeration.hasMoreElements()) {
Object obj = enumeration.nextElement();
if (obj instanceof ColumnGroup) {
Vector groups = (Vector) ((ColumnGroup) obj).getColumnGroups(c,
(Vector) g.clone());
if (groups != null)
return groups;
}
}
return null;
}
public TableCellRenderer getHeaderRenderer() {
return renderer;
}
public Object getHeaderValue() {
return text;
}
public int getSize() {
return v == null ? 0 : v.size();
}
public Dimension getSize(JTable table) {
Component comp = renderer.getTableCellRendererComponent(table,
getHeaderValue(), false, false, -1, -1);
int height = comp.getPreferredSize().height;
int width = 0;
Enumeration enumeration = v.elements();
while (enumeration.hasMoreElements()) {
Object obj = enumeration.nextElement();
if (obj instanceof TableColumn) {
TableColumn aColumn = (TableColumn) obj;
width += aColumn.getWidth();
width += margin;
} else {
width += ((ColumnGroup) obj).getSize(table).width;
}
}
return new Dimension(width, height);
}
/**
*
* 创建日期:(2003-7-14 10:53:26)
*
* @return java.lang.String
*/
public java.lang.String getText() {
return text;
}
/**
* 列表头中删除Column 创建日期:(2002-9-25 15:49:00)
*/
public boolean removeColumn(ColumnGroup ptg, TableColumn tc) {
boolean retFlag = false;
if (tc != null) {
for (int i = 0; i < ptg.v.size(); i++) {
Object tmpObj = ptg.v.get(i);
if (tmpObj instanceof ColumnGroup) {
retFlag = removeColumn((ColumnGroup) tmpObj, tc);
// 如果找到返回
if (retFlag)
break;
} else if (tmpObj instanceof TableColumn) {
// 判断是否查找的对象
if (tmpObj == tc) {
ptg.v.remove(i);
retFlag = true;
break;
}
}
}
}
return retFlag;
}
/**
* 列表头中删除ColumnGrp 删除返回true,否则返回false; 创建日期:(2002-9-25 15:49:00)
*/
public boolean removeColumnGrp(ColumnGroup ptg, ColumnGroup tg) {
boolean retFlag = false;
if (tg != null) {
for (int i = 0; i < ptg.v.size(); i++) {
Object tmpObj = ptg.v.get(i);
if (tmpObj instanceof ColumnGroup) {
// 判断是否查找的对象
if (tmpObj == tg) {
ptg.v.remove(i);
retFlag = true;
break;
} else {
retFlag = removeColumnGrp((ColumnGroup) tmpObj, tg);
// 如果找到返回
if (retFlag)
break;
}
} else if (tmpObj instanceof TableColumn) {
break;
}
}
}
return retFlag;
}
public void setColumnMargin(int margin) {
this.margin = margin;
Enumeration enumeration = v.elements();
while (enumeration.hasMoreElements()) {
Object obj = enumeration.nextElement();
if (obj instanceof ColumnGroup) {
((ColumnGroup) obj).setColumnMargin(margin);
}
}
}
public void setHeaderRenderer(TableCellRenderer renderer) {
if (renderer != null) {
this.renderer = renderer;
}
}
/**
*
* 创建日期:(2003-7-14 10:53:26)
*
* @param newText
* java.lang.String
*/
public void setText(java.lang.String newText) {
text = newText;
}
}
2、GroupableHeader继承自JTableHeader，为多表头结构的管理者 import java.util.Enumeration;
import java.util.Vector;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
/**
* GroupableTableHeader
* @author flyx
*/
public class GroupableTableHeader extends JTableHeader {
private static final String uiClassID = "GroupableTableHeaderUI";
protected Vector columnGroups = null;
public GroupableTableHeader(TableColumnModel model) {
super(model);
setUI(new GroupableTableHeaderUI());
setReorderingAllowed(false);
setRequestFocusEnabled(false);
}
public void addColumnGroup(ColumnGroup g) {
if (columnGroups == null) {
columnGroups = new Vector();
}
columnGroups.addElement(g);
}
/**
*
* 创建日期:(2001-8-31 15:54:29)
*/
public void clearColumnGroups() {
columnGroups = null;
}
public ColumnGroup[] getColumnGroups() {
ColumnGroup[] retg=null;
if (columnGroups.size()>0) {
retg=new ColumnGroup[columnGroups.size()];
columnGroups.copyInto(retg);
}
return retg;
}
public Enumeration getColumnGroups(TableColumn col) {
if (columnGroups == null)
return null;
Enumeration enum = columnGroups.elements();
while (enum.hasMoreElements()) {
ColumnGroup cGroup = (ColumnGroup) enum.nextElement();
Vector v_ret = (Vector) cGroup.getColumnGroups(col, new Vector());
if (v_ret != null) {
return v_ret.elements();
}
}
return null;
}
/**
* Identifies whether or not this component can receive the focus.
* A disabled button, for example, would return false.
