Base64 decode data: Difference between revisions
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=={{header|Java}}==
<p>
Java offers the <code>Base64</code> class, which includes both the <code>Encoder</code> and <code>Decoder</code> classes.<br />
The implementation supports RFC 4648 and RFC 2045.
</p>
<p>
Similar to the encoding process, the usage is very simple, supply a <code>byte</code> array, and it will return an encoded <code>byte</code> array.
</p>
<p>
The class uses a static construct, so instead of instantiation via a constructor, you use one of the <kbd>static</kbd> methods.<br />
In this case we'll use the <code>Base64.getDecoder</code> method to acquire our instance.
</p>
<syntaxhighlight lang="java">
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Base64;
</syntaxhighlight>
<syntaxhighlight lang="java">
void decodeToFile(String path, byte[] bytes) throws IOException {
try (FileOutputStream stream = new FileOutputStream(path)) {
byte[] decoded = Base64.getDecoder().decode(bytes);
stream.write(decoded, 0, decoded.length);
}
}
</syntaxhighlight>
The operation is successful, creating a 48 by 48-pixel, 32-bit color graphic, at 15,086 bytes.
<br /><br />
An alternate demonstration
{{trans|Kotlin}}
<syntaxhighlight lang="java">import java.nio.charset.StandardCharsets;
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