YouTipJava8 Base64
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In Java 8, Base64 encoding has become a standard part of the Java class library.
Java 8 includes built-in encoders and decoders for Base64.
The Base64 utility class provides a set of static methods to obtain the following three types of Base64 encoders/decoders:
* **Basic:** The output is mapped to a set of characters A-Za-z0-9+/. The encoding does not add any line breaks, and the output's decoding only supports A-Za-z0-9+/.
* **URL:** The output is mapped to a set of characters A-Za-z0-9+_. The output is suitable for URLs and filenames.
* **MIME:** The output is mapped to a MIME-friendly format. The output does not exceed 76 characters per line, and uses 'r' followed by 'n' as line separators. The encoded output has no line separators at the end.
### Inner Classes
| No. | Inner Class & Description |
| --- | --- |
| 1 | **static class Base64.Decoder** This class implements a decoder for decoding byte data using the Base64 encoding scheme. |
| 2 | **static class Base64.Encoder** This class implements an encoder for encoding byte data using the Base64 encoding scheme. |
### Methods
| No. | Method Name & Description |
| --- | --- |
| 1 | **static Base64.Decoder getDecoder()** Returns a Base64.Decoder that decodes using the Basic type base64 encoding scheme. |
| 2 | **static Base64.Encoder getEncoder()** Returns a Base64.Encoder that encodes using the Basic type base64 encoding scheme. |
| 3 | **static Base64.Decoder getMimeDecoder()** Returns a Base64.Decoder that decodes using the MIME type base64 encoding scheme. |
| 4 | **static Base64.Encoder getMimeEncoder()** Returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme. |
| 5 | **static Base64.Encoder getMimeEncoder(int lineLength, byte[] lineSeparator)** Returns a Base64.Encoder that encodes using the MIME type base64 encoding scheme, allowing specification of the line length and line separator via parameters. |
| 6 | **static Base64.Decoder getUrlDecoder()** Returns a Base64.Decoder that decodes using the URL and Filename safe type base64 encoding scheme. |
| 7 | **static Base64.Encoder getUrlEncoder()** Returns a Base64.Encoder that encodes using the URL and Filename safe type base64 encoding scheme. |
**Note:** Many methods of the Base64 class are inherited from the **java.lang.Object** class.
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## Base64 Example
The following example demonstrates the use of Base64:
## Java8Tester.java File
import java.util.Base64; import java.util.UUID; import java.io.UnsupportedEncodingException; public class Java8Tester{public static void main(String args[]){try{String base64encodedString = Base64.getEncoder().encodeToString("tutorial?java8".getBytes("utf-8")); System.out.println("Base64 Encoded String (Basic) :" + base64encodedString); byte[]base64decodedBytes = Base64.getDecoder().decode(base64encodedString); System.out.println("Original String: " + new String(base64decodedBytes, "utf-8")); base64encodedString = Base64.getUrlEncoder().encodeToString("tutorial?java8".getBytes("utf-8")); System.out.println("Base64 Encoded String (URL) :" + base64encodedString); StringBuilder stringBuilder = new StringBuilder(); for(int i = 0; i<10; ++i){stringBuilder.append(UUID.randomUUID().toString()); }byte[]mimeBytes = stringBuilder.toString().getBytes("utf-8"); String mimeEncodedString = Base64.getMimeEncoder().encodeToString(mimeBytes); System.out.println("Base64 Encoded String (MIME) :" + mimeEncodedString); }catch(UnsupportedEncodingException e){System.out.println("Error :" + e.getMessage()); }}}
Executing the above script, the output is:
$ javac Java8Tester.java $ java Java8TesterOriginal String: tutorial?java8 Base64 Encoded String (URL) :VHV0b3JpYWxzUG9pbnQ_amF2YTg=Base64 Encoded String (MIME) :M2Q4YmUxMTEtYWRkZi00NzBlLTgyZDgtN2MwNjgzOGY2NGFlOTQ3NDYyMWEtZDM4ZS00YWVhLTkz OTYtY2ZjMzZiMzFhNmZmOGJmOGI2OTYtMzkxZi00OTJiLWEyMTQtMjgwN2RjOGI0MTBmZWUwMGNkNTktY2ZiZS00MTMxLTgzODctNDRjMjFkYmZmNGM4Njg1NDc3OGItNzNlMC00ZWM4LTgxNzAtNjY3NTgyMGY3YzVhZWQyMmNiZGItOTIwZi00NGUzLTlkMjAtOTkzZTI1MjUwMDU5ZjdkYjg2M2UtZTJm YS00Y2Y2LWIwNDYtNWQ2MGRiOWQyZjFiMzJhMzYxOWQtNDE0ZS00MmRiLTk3NDgtNmM4NTczYjMx ZDIzNGRhOWU4NDAtNTBiMi00ZmE2LWE0M2ItZjU3MWFiNTI2NmQ2NTlmMTFmZjctYjg1NC00NmE1LWEzMWItYjk3MmEwZTYyNTdk
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