This topic is about Java 8 – Base64.
With Java 8, Base64 has finally got its due. Java 8 now has inbuilt encoder and decoder for Base64 encoding. In Java 8, we can use three types of Base64 encoding.
- Simple − Output is mapped to a set of characters lying in A-Za-z0-9+/. The encoder does not add any line feed in output, and the decoder rejects any character other than A-Za-z0-9+/.
- URL − Output is mapped to set of characters lying in A-Za-z0-9+_. Output is URL and filename safe.
- MIME − Output is mapped to MIME friendly format. Output is represented in lines of no more than 76 characters each, and uses a carriage return ‘\r’ followed by a linefeed ‘\n’ as the line separator. No line separator is present to the end of the encoded output.
Nested Classes
| Sr.No. | Nested class & Description |
|---|---|
| 1 | static class Base64.DecoderThis class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045. |
| 2 | static class Base64.EncoderThis class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045. |
Methods
| Sr.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 decoding 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 with specified line length and line separators. |
| 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. |
Methods Inherited
This class inherits methods from the following class −
- java.lang.Object
Base64 Example
Create the following Java program using any editor of your choice in say C:/> JAVA.
Java8Tester.java
import java.util.Base64;
import java.util.UUID;
import java.io.UnsupportedEncodingException;
public class HelloWorld {
public static void main(String args[]) {
try {
// Encode using basic encoder
String base64encodedString = Base64.getEncoder().encodeToString(
"Adglob?java8".getBytes("utf-8"));
System.out.println("Base64 Encoded String (Basic) :" + base64encodedString);
// Decode
byte[] base64decodedBytes = Base64.getDecoder().decode(base64encodedString);
System.out.println("Original String: " + new String(base64decodedBytes, "utf-8"));
base64encodedString = Base64.getUrlEncoder().encodeToString(
"Adglob?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());
}
}
}
Verify the Result
Compile the class using javac compiler as follows −
C:\JAVA>javac Java8Tester.java
Now run the Java8Tester as follows −
C:\JAVA>java Java8Tester
It should produce the following output −
Base64 Encoded String (Basic) :VHV0b3JpYWxzUG9pbnQ/amF2YTg= Original String: Adglob?java8 Base64 Encoded String (URL) :VHV0b3JpYWxzUG9pbnQ_amF2YTg= Base64 Encoded String (MIME) :YmU3NWY2ODktNGM5YS00ODlmLWI2MTUtZTVkOTk2YzQ1Njk1Y2EwZTg2OTEtMmRiZC00YTQ1LWJl NTctMTI1MWUwMTk0ZWQyNDE0NDAwYjgtYTYxOS00NDY5LTllYTctNjc1YzE3YWJhZTk1MTQ2MDQz NDItOTAyOC00ZWI0LThlOTYtZWU5YzcwNWQyYzVhMTQxMWRjYTMtY2MwNi00MzU0LTg0MTgtNGQ1 MDkwYjdiMzg2ZTY0OWU5MmUtZmNkYS00YWEwLTg0MjQtYThiOTQxNDQ2YzhhNTVhYWExZjItNjU2 Mi00YmM4LTk2ZGYtMDE4YmY5ZDZhMjkwMzM3MWUzNDMtMmQ3MS00MDczLWI0Y2UtMTQxODE0MGU5 YjdmYTVlODUxYzItN2NmOS00N2UyLWIyODQtMThlMWVkYTY4M2Q1YjE3YTMyYmItZjllMS00MTFk LWJiM2UtM2JhYzUxYzI5OWI4
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