Encoding as Base64 in Java

Question

I need to encode some data in the Base64 encoding in Java. How do I do that? What is the name of the class that provides a Base64 encoder?

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Answer 1

If you are using Spring Framework at least version 4.1, you can use the org.springframework.util.Base64Utils class:

byte[] raw = { 1, 2, 3 };
String encoded = Base64Utils.encodeToString(raw);
byte[] decoded = Base64Utils.decodeFromString(encoded);

It will delegate to Java 8's Base64, Apache Commons Codec, or JAXB DatatypeConverter, depending on what is available.

Answer 2

On Android, use the static methods of the android.util.Base64 utility class. The referenced documentation says that the Base64 class was added in API level 8 (Android 2.2 (Froyo)).

import android.util.Base64;

byte[] encodedBytes = Base64.encode("Test".getBytes());
Log.d("tag", "encodedBytes " + new String(encodedBytes));

byte[] decodedBytes = Base64.decode(encodedBytes);
Log.d("tag", "decodedBytes " + new String(decodedBytes));

Answer 3

Use Java 8's never-too-late-to-join-in-the-fun class: java.util.Base64

new String(Base64.getEncoder().encode(bytes));

Answer 4

For Java 6-7, the best option is to borrow code from the Android repository. It has no dependencies.

https://github.com/android/platform_frameworks_base/blob/master/core/java/android/util/Base64.java

Answer 5

Simple example with Java 8:

import java.util.Base64;

String str = "your string";
String encodedStr = Base64.getEncoder().encodeToString(str.getBytes("utf-8"));

Answer 6

Apache Commons has a nice implementation of Base64. You can do this as simply as:

// Encrypt data on your side using BASE64
byte[] bytesEncoded = Base64.encodeBase64(str .getBytes());
System.out.println("ecncoded value is " + new String(bytesEncoded));

// Decrypt data on other side, by processing encoded data
byte[] valueDecoded= Base64.decodeBase64(bytesEncoded );
System.out.println("Decoded value is " + new String(valueDecoded));

You can find more details about base64 encoding at Base64 encoding using Java and JavaScript.