基于Java实现进制转换工具类的示例代码

/**

* 支持 import Java 标准库 (JDK 1.8)

*/

import java.util.*;

/**

* 六十二进制转换工具类

*/

public class Main {

   // 将字符集打乱就会带有一点加密效果

   private static final String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" ;

    private static final int scale = 62 ;

    public static void main(String []args) {

         Long source1 = 121231313213123L;

         String source2 = "IAvzjI19" ;

         System.out.println(source1 + " encode -> " + encode(source1, chars));

         System.out.println(source2 + " decode -> " + decode(source2, chars));

    }

    /**

      * 将数字转为62进制

      *

      * @param num Long 型数字

      * @return 62进制字符串

      */

     public static String encode( long num, String chars) {

         StringBuilder sb = new StringBuilder();

         int remainder;

         while (num > scale - 1 ) {

             remainder = Long.valueOf(num % scale).intValue();

             sb.append(chars.charAt(remainder));

             num = num / scale;

         }

         sb.append(chars.charAt(Long.valueOf(num).intValue()));

         return sb.reverse().toString();

     }

     /**

      * 62进制字符串转为数字

      *

      * @param str 编码后的62进制字符串

      * @return 解码后的 10 进制字符串

      */

     public static long decode(String str, String chars) {

         long num = 0 ;

         int index;

         for ( int i = 0 ; i < str.length(); i++) {

             index = chars.indexOf(str.charAt(i));

             num += ( long ) (index * (Math.pow(scale, str.length() - i - 1 )));

         }

         return num;

     }

}