Which Java library provides base64 encoding/decoding? [duplicate]

Question

I am wondering which library to use for base64 encoding/decoding? I need this functionality be stable enough for production use.

Answer 1

Java 9

Use the Java 8 solution. Note DatatypeConverter can still be used, but it is now within the java.xml.bind module which will need to be included.

module org.example.foo {     requires java.xml.bind; } 

Java 8

Java 8 now provides java.util.Base64 for encoding and decoding base64.

Encoding

byte[] message = "hello world".getBytes(StandardCharsets.UTF_8); String encoded = Base64.getEncoder().encodeToString(message); System.out.println(encoded); // => aGVsbG8gd29ybGQ= 

Decoding

byte[] decoded = Base64.getDecoder().decode("aGVsbG8gd29ybGQ="); System.out.println(new String(decoded, StandardCharsets.UTF_8)); // => hello world 

Java 6 and 7

Since Java 6 the lesser known class javax.xml.bind.DatatypeConverter can be used. This is part of the JRE, no extra libraries required.

Encoding

byte[] message = "hello world".getBytes("UTF-8"); String encoded = DatatypeConverter.printBase64Binary(message); System.out.println(encoded); // => aGVsbG8gd29ybGQ=   

Decoding

byte[] decoded = DatatypeConverter.parseBase64Binary("aGVsbG8gd29ybGQ="); System.out.println(new String(decoded, "UTF-8")); // => hello world 

Answer 2

Within Apache Commons, commons-codec-1.7.jar contains a Base64 class which can be used to encode.

Via Maven:

<dependency>     <groupId>commons-codec</groupId>     <artifactId>commons-codec</artifactId>     <version>20041127.091804</version> </dependency> 

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