java随机产生网页颜色

int randomNumber(){   
return (int)Math.floor(Math.random()*256);   
}
String decToHex(int dec)   
{   
String hexStr = "0123456789ABCDEF";   
int low = Math.abs(dec % 16);   
int high = Math.abs((dec - low)/16);   
String hex = "" + (hexStr.length()>high?hexStr.charAt(high):hexStr.charAt(0)) + (hexStr.length()>low?hexStr.charAt(low):hexStr.charAt(10));   
return hex;   
}
String randomBgColor()   
{   
String r,g,b;   
r = decToHex(randomNumber()-1);   
g = decToHex(randomNumber()-1);   
b = decToHex(randomNumber()-1);   
return "#" + r + g + b;   
}