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) {
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);

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