创建头像下拉列表

HashMap<String,ImageIcon>  getIcons()
{
//返回一个Map, key是文件的路径

File folder = new File("images/heads");
File[] files = folder.listFiles();
HashMap<String, ImageIcon> heads = new HashMap<String, ImageIcon>();
for (int i = 0; i < files.length; i++) {
File file = files[i];
heads.put(file.getPath(), new ImageIcon(file.getAbsolutePath()));
}
return heads;
}

this.headSelect = new JComboBox(this.heads.keySet().toArray());
this.headSelect.setMaximumRowCount(5);
this.headSelect.setRenderer(new HeadComboBoxRenderer(this.heads));

HeadComboBoxRenderer类

import java.awt.Component;
import java.util.HashMap;
import java.util.Map;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;

public class HeadComboBoxRenderer extends JLabel implements ListCellRenderer {

private Map<String, ImageIcon> heads;

public HeadComboBoxRenderer(HashMap<String, ImageIcon> heads)
{
this.heads=heads;
setOpaque(true);
setHorizontalAlignment(CENTER);
setVerticalAlignment(CENTER);
}

public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
String selectValue = (String)value;
//设置背景颜色
if (isSelected) {
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
} else {
setBackground(list.getBackground());
setForeground(list.getForeground());
}
//从头像的Map中得到当前选择的头像图片
Icon icon = this.heads.get(selectValue);
setIcon(icon);
if (icon != null) setFont(list.getFont());
return this;
}

}