10进制和62进制相互转换

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private static char[] charSet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();                  /**       * 将10进制转化为62进制        * @param number        * @param length 转化成的62进制长度，不足length长度的话高位补0，否则不改变什么       * @return       */        public static String _10_to_62(long number, int length){             Long rest=number;             Stack<Character> stack=new Stack<Character>();             StringBuilder result=new StringBuilder(0);             while(rest!=0){                 stack.add(charSet[new Long((rest-(rest/62)*62)).intValue()]);                 rest=rest/62;             }             for(;!stack.isEmpty();){                 result.append(stack.pop());             }             int result_length = result.length();             StringBuilder temp0 = new StringBuilder();             for(int i = 0; i < length - result_length; i++){                 temp0.append('0');             }                          return temp0.toString() + result.toString();            }                        /**       * 将62进制转换成10进制数       *        * @param ident62       * @return       */        private static String convertBase62ToDecimal( String ident62 ) {            int decimal = 0;            int base = 62;            int keisu = 0;            int cnt = 0;                byte ident[] = ident62.getBytes();            for ( int i = ident.length - 1; i >= 0; i-- ) {                int num = 0;                if ( ident[i] > 48 && ident[i] <= 57 ) {                    num = ident[i] - 48;                }                else if ( ident[i] >= 65 && ident[i] <= 90 ) {                    num = ident[i] - 65 + 10;                }                else if ( ident[i] >= 97 && ident[i] <= 122 ) {                    num = ident[i] - 97 + 10 + 26;                }                keisu = (int) java.lang.Math.pow( (double) base, (double) cnt );                decimal += num * keisu;                cnt++;            }            return String.format( "%08d", decimal );        }                /**       * @param args       */        public static void main(String[] args) {            // TODO Auto-generated method stub            System.out.println("62System=" +_10_to_62(Integer.parseInt("35174605"), 5));            System.out.println("10System=" +convertBase62ToDecimal("2NaWL"));        }                }
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