电话号码压缩方法

/**
 * 电话号码采用62进制压缩方法工具
 * @author XuGuo
 * @since 2013-3-9
 */
public class TelephoneCompressUtil {
	
	private static char[] bit62 = new char[]{'0','1','2','3','4','5','6','7','8','9',
			'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
			'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String telephoneNumberStr = "18957124766";
		long telephoneNumber = Long.parseLong(telephoneNumberStr);
		System.out.println(telephoneNumber);
		String abc = digit10to16(telephoneNumber);
		System.out.println("十进制数转换成六十二进制数结尾为："+abc);
		System.out.println("六十二进制数转换成十进制数结尾为："+digit16to10(abc));
	}
	
	/**
	 * 十进制数(18957124766)转换成六十二进制数(kGWa8S)
	 * 18957124766除以62等于305760076;  18957124766除以62取余54
	 * 305760076除以62等于4931614;  305760076除以62取余8
	 * 4931614除以62等于79542;  4931614除以62取余10
	 * 79542除以62等于1282;  79542除以62取余58
	 * 1282除以62等于20;  1282除以62取余42
	 * 20除以62等于0;  20除以62取余20
	 * @param source10digit
	 * @return
	 */
	public static String digit10to16(long source10digit){
		StringBuffer sb = new StringBuffer();
		long b = divisionBy62(source10digit);
		int a = modBy62(source10digit);
		long temp = 0;
		System.out.println(source10digit+"除以62等于"+b+";  "+source10digit+"除以62取余"+a);
		while(b>0){
			sb.append(bit62[a]);
			temp = b;
			a = modBy62(b);
			b = divisionBy62(b);
			System.out.println(temp+"除以62等于"+b+";  "+temp+"除以62取余"+a);
		}
		sb.append(bit62[a]);
		String abc = sb.reverse().toString();
		return abc;
	}
	
	/**
	 * 对十进制数除以62
	 * @param dividend
	 * @return
	 */
	private static long divisionBy62(long dividend){
		return dividend/62;
	}
	
	/**
	 * 对十进制数除以62取余
	 * @param dividend
	 * @return
	 */
	private static int modBy62(long dividend){
		return (int)(dividend%62);
	}
	
	/**
	 * 获取六十二进制数字符在该进制规范中的顺序编号
	 * @param a
	 * @return
	 */
	private static int digit16by10(char a){
		for(int i = 0;i<bit62.length;i++){
			if(a == bit62[i]){
				return i;
			}
		}
		return 0;
	}
	
	
	/**
	 * 六十二进制数(kGWa8S)转换成十进制数结(18957124766)
	 * 20(k)*62^5=18322656640
	 * 42(G)*62^4=620606112
	 * 58(W)*62^3=13823024
	 * 10(a)*62^2=38440
	 * 8(8)*62^1=496
	 * 54(S)*62^0=54
	 * @param str
	 * @return
	 */
	public static long digit16to10(String str){
		if(str==null||"".equals(str.trim())){
			return 0;
		}else{
			long a = 0;
			int strLen = str.length();
			for(int i=0;i<strLen;i++){
				//System.out.println(digit16by10((char)str.charAt(i))+"("+str.charAt(i)+")*"+"62^"+(strLen-i-1)+"="+(digit16by10((char)str.charAt(i))*(long)Math.pow(62,strLen-i-1)));
				a = a+digit16by10((char)str.charAt(i))*(long)Math.pow(62,strLen-i-1);
			}
			return a;
		}
	}
}