Colour对象与16进制RGB颜色代码转换

[java]代码库

import java.awt.Color;

import jxl.format.Colour;

public class ColorUtil {

	
	public static Colour getNearestColour(Color awtColor) {
		  Colour color = null;

		  Colour[] colors = Colour.getAllColours();
		  if ((colors != null) && (colors.length > 0)) {
		   Colour crtColor = null;
		   int[] rgb = null;
		   int diff = 0;
		   int minDiff = 999;

		   for (int i = 0; i < colors.length; i++) {
		    crtColor = colors[i];
		    rgb = new int[3];
		    rgb[0] = crtColor.getDefaultRGB().getRed();
		    rgb[1] = crtColor.getDefaultRGB().getGreen();
		    rgb[2] = crtColor.getDefaultRGB().getBlue();

		    diff = Math.abs(rgb[0] - awtColor.getRed())
		      + Math.abs(rgb[1] - awtColor.getGreen())
		      + Math.abs(rgb[2] - awtColor.getBlue());

		    if (diff < minDiff) {
		     minDiff = diff;
		     color = crtColor;
		    }
		   }
		  }
		  if (color == null)
		   color = Colour.BLACK;
		  return color;
		 }
	//Color转换为16进制显示
    public static String toHexEncoding(Color color) {
        String R, G, B;
        StringBuffer sb = new StringBuffer();

        R = Integer.toHexString(color.getRed());
        G = Integer.toHexString(color.getGreen());
        B = Integer.toHexString(color.getBlue());

        R = R.length() == 1 ? "0" + R : R;
        G = G.length() == 1 ? "0" + G : G;
        B = B.length() == 1 ? "0" + B : B;

        sb.append("0x");
        sb.append(R);
        sb.append(G);
        sb.append(B);

        return sb.toString();
    }
    
    //把字符串表达的颜色值转换成java.awt.Color
    public static Color parseToColor(final String c) {
        Color convertedColor = Color.ORANGE;
        try {
            convertedColor = new Color(Integer.parseInt(c, 16));
        } catch(NumberFormatException e) {
            // codes to deal with this exception
        }
        return convertedColor;
    }
    public static Colour  getColour(final String c) {   	
    	Color  cl=parseToColor(c);   	
    	return  getNearestColour(cl);
    }
    //
}