BASE64 encoding and decoding, BASE64 encoding and decoding

BASE64 encoding and decoding, BASE64 encoding and decoding

Dependent jar: import org. apache. commons. codec. binary. Base64;

BASE64 and other similar Encoding algorithms are usually used to convert binary data into text data to simplify storage or transmission. More specifically, the BASE64 algorithm is mainly used to convert binary data to the ASCII string format. The Java language provides a very good implementation of the BASE64 algorithm, namely the Apache Commons Codec toolkit. This article briefly describes how to use BASE64 and how it works.

The following code uses BASE64 to encode the string:

 

import java.io.UnsupportedEncodingException; import org.apache.commons.codec.binary.Base64;    public class Base64Test {     public static void main(String[] args){         String str = "Hello World";         try{             System.out.println("RESULT: " + encodeStr(str));         } catch(UnsupportedEncodingException e){             e.printStackTrace();         }     } }

 

/*** Decrypt ** @ param pwd * @ return * @ see [Class, Class # method, class # member] */public static String decodeStr (String pwd) {Base64 base64 = new Base64 (); byte [] debytes = base64.decodeBase64 (new String (pwd ). getBytes (); return new String (debytes );} /*** encrypt ** @ param pwd * @ return * @ see [Class, Class # method, class # member] */public static String encodeStr (String pwd) {Base64 base64 = new Base64 (); byte [] enbytes = base64.encodeBase64Chunked (pwd. getBytes (); return new String (enbytes );

 

Output result:

1. RESULT: SGVsbG8gV29ybGQ =

The output string is the 8-bit binary value of the "Hello world" string, which is connected together and grouped by 6 digits. Then, each group is converted into a separate number and mapped to the Base64 index.

binary  dec Base64 010010  18  S 000110  6   G 010101  21  V 101100  44  s 011011  27  b 000110  6   G 111100  60  8 100000  32  g 010101  29  d 110110  54  2 111101  61  9 110010  50  y 011011  27  b 000110  6   G 010000  16  Q

Note: "=" is added at the end of the string, which indicates the end of the string encoding.