程序包 net.qimooc.commons.utils

类 Base62

  • public class Base62
extends java.lang.Object
    Base62 numbers/strings encoding/decoding utility methods.

    Only positive numbers are supported. All methods in this class with throw an IllegalArgumentException if a negative number is given. If you want to use negative numbers you'll have to handle prepending - to the Base62 string, that becomes a sort of Base62+1 string.

    Here is sample code to handle negative numbers prepending - to them: 

     long number = -1234567890;
 String enc = ( Math.abs( number ) != number ? "-" : "" ) + Base62.encode( Math.abs( number ) );
 long dec = enc.startsWith( "-" ) ? -Base62.decodeLong( enc.substring( 1 ) ) : Base62.decodeLong( enc );
    Note that this isn't true Base62 anymore.

    • 方法概要

      所有方法 静态方法 具体方法 
      修饰符和类型 方法 说明
      static java.math.BigInteger decode​(java.lang.String base62String)  
      static java.math.BigInteger decode​(java.lang.String base62String, java.nio.charset.Charset charset)  
      static byte[] decodeBytes​(java.lang.String base62String)  
      static byte[] decodeBytes​(java.lang.String base62String, java.nio.charset.Charset charset)  
      static int decodeInt​(java.lang.String base62String)  
      static int decodeInt​(java.lang.String base62String, java.nio.charset.Charset charset)  
      static long decodeLong​(java.lang.String base62String)  
      static long decodeLong​(java.lang.String base62String, java.nio.charset.Charset charset)  
      static java.lang.String encode​(byte[] bytes)  
      static java.lang.String encode​(java.lang.Integer number)  
      static java.lang.String encode​(java.lang.Long number)  
      static java.lang.String encode​(java.math.BigInteger number)  

      • 从类继承的方法 java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • 方法详细资料

      • decode

        public static java.math.BigInteger decode​(java.lang.String base62String)

      • decode

        public static java.math.BigInteger decode​(java.lang.String base62String,
                                          java.nio.charset.Charset charset)

      • decodeInt

        public static int decodeInt​(java.lang.String base62String)
                     throws java.lang.ArithmeticException
        抛出:
        java.lang.ArithmeticException

      • decodeInt

        public static int decodeInt​(java.lang.String base62String,
                            java.nio.charset.Charset charset)
                     throws java.lang.ArithmeticException
        抛出:
        java.lang.ArithmeticException

      • decodeLong

        public static long decodeLong​(java.lang.String base62String)
                       throws java.lang.ArithmeticException
        抛出:
        java.lang.ArithmeticException

      • decodeLong

        public static long decodeLong​(java.lang.String base62String,
                              java.nio.charset.Charset charset)
                       throws java.lang.ArithmeticException
        抛出:
        java.lang.ArithmeticException

      • decodeBytes

        public static byte[] decodeBytes​(java.lang.String base62String)
                          throws java.lang.ArithmeticException
        抛出:
        java.lang.ArithmeticException

      • decodeBytes

        public static byte[] decodeBytes​(java.lang.String base62String,
                                 java.nio.charset.Charset charset)
                          throws java.lang.ArithmeticException
        抛出:
        java.lang.ArithmeticException

      • encode

        public static java.lang.String encode​(java.lang.Integer number)

      • encode

        public static java.lang.String encode​(java.lang.Long number)

      • encode

        public static java.lang.String encode​(byte[] bytes)

      • encode

        public static java.lang.String encode​(java.math.BigInteger number)