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DHtmlx Grid Export to Excel servlet jar. Need download "Adobe Acrobat Reader DC Font Pack (Continuous)" file FontPack1500720033_XtdAlf_Lang_DC.msi from http://www.adobe.com/support/downloads/detail.jsp?ftpID=5877 or http://download.csdn.net/download/jiaoxiaogu/9539196 and install it.

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package com.dhtmlx.xml2pdf;
import java.util.Hashtable;
import java.util.regex.*;



public class RGBColor {
	static Hashtable parsedColors = new Hashtable();

	public static double[] getRGBColor(String color) {
		if (parsedColors.containsKey(color))
			return (double[]) parsedColors.get(color);
		String original = color;
		color = RGBColor.processColorForm(color);
		double[] result = new double[3];
		String r = color.substring(0, 2);
		String g = color.substring(2, 4);
		String b = color.substring(4, 6);
		result[0] = Integer.parseInt(r, 16)/255.0;
		result[1] = Integer.parseInt(g, 16)/255.0;
		result[2] = Integer.parseInt(b, 16)/255.0;
		parsedColors.put(original, result);
		return result;
	}

    public static int getColor(String color)
    {
        return Integer.parseInt(color, 16);
    }

	public static String processColorForm(String color) {
		if (color.equals("transparent")) {
			return "";
		}

		Pattern p1 = Pattern.compile("#[0-9A-Fa-f]{6}");
		Matcher m1 = p1.matcher(color);
		if (m1.matches()) {
			return color.substring(1);
		}

		Pattern p2 = Pattern.compile("[0-9A-Fa-f]{6}");
		Matcher m2 = p2.matcher(color);
		if (m2.matches()) {
			return color;
		}

		Pattern p3 = Pattern.compile("rgb\\s?\\(\\s?(\\d{1,3})\\s?,\\s?(\\d{1,3})\\s?,\\s?(\\d{1,3})\\s?\\)");
		Matcher m3 = p3.matcher(color);

		if (m3.matches()) {
			color = "";
			String r = m3.group(1);
			String g = m3.group(2);
			String b = m3.group(3);
			r = Integer.toHexString(Integer.parseInt(r));
			r = (r.length() == 1) ? "0" + r : r;
			g = Integer.toHexString(Integer.parseInt(g));
			g = (g.length() == 1) ? "0" + g : g;
			b = Integer.toHexString(Integer.parseInt(b));
			b = (b.length() == 1) ? "0" + b : b;
			color = r + g + b;
			return color;
		}
		return "";
	}
}