16进制 ，Color，Colour转换

 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);
     }
     //
 }