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All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation. No line separator is added to the end of the encoded output. The encoded output must be represented in lines of no more than 76 characters each and uses a carriage return '\r' followed immediately by a linefeed '\n' as the line separator. It uses the Base64 alphabet as specified in RFC 2045 for encoding and decoding operations. The decoder rejects data that contains characters outside the base64 alphabet. The encoder does not add any line separator character. It uses the Base64 alphabet specified by Java in RFC 4648 for encoding and decoding operations. It uses the Base64 alphabet specified by Java in RFC 4648 and RFC 2045 for encoding and decoding operations. You can use these methods at the following levels. This class provides three different encoders and decoders to encrypt information at each level. You need to import 64 in your source file to use its methods. You can encrypt and decrypt your data by using provided methods. Java provides a class Base64 to deal with encryption. String mimeEncodedStr = Base64.getMimeEncoder().encodeToString(bytes) We can use the getMimeEncoder() and the encodeToString() methods for the encoding. Note that no line separator is present at the end of the encoded string. In the encoded output, each line contains a maximum of 76 characters.Įach line ends with a carriage return( \r) followed by a linefeed( \n) as the line separator. MIME stands for Multipurpose Internet Mail Extension, and the Base64 class uses the Base64 Alphabet for its encoding and decoding operations. ("Decoded URL: " + decodedUrl) Įncoded URL: aHR0cHM6Ly9nby5qYXZhLz9pbnRjbXA9Z29qYXZhLWJhbm5lci1qYXZhLWNvbQ=ĭecoded URL: Base64 MIME Encoding and Decoding
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String decodedUrl = new String(decodedUrlBytes) ("Encoded URL: " + encodedUrl) īyte decodedUrlBytes = Base64.getUrlDecoder().decode(encodedUrl) String encodedUrl = Base64.getUrlEncoder().encodeToString(urlToEncode.getBytes()) Again, we can use the decode() method with this decoder. Similarly, we have a getUrlDecoder() method that returns a URL decoder. Then, we can use the encodeToString() method as we did in the previous section. We can use the getUrlEncoder() method to obtain a Base64 URL encoder. String encodedStr = Base64.getEncoder().withoutPadding().encodeToString(bytesToEncode) //encoding without paddingīase64 class handles URL encoding and decoding by using the URL and Filename safe Base64 Alphabet. If we don't want this padding, we can use the withoutPadding() method on the encoder. String encodedStr = Base64.getEncoder().encodeToString(bytesToEncode) //Encoding with padding We can see the two equals sign(=) at the end of the encoded string. The encoding performed in the previous section adds additional padding character( =) if the encoded string's length is not a multiple of three. ("Decoded String: " + decodedStr) ĭecoded String: Hello World Base64 Encoding Without Padding String decodedStr = new String(decodedByteArr) ("Encoded String: " + encodedStr) īyte decodedByteArr = Base64.getDecoder().decode(encodedStr) It will take an encoded string as input and returns the decoded string. Then, we will use the decode() method of the decoder. To decode an encoded string, we will use Base64.Decoder returned by the getDecoder() method. String encodedStr = Base64.getEncoder().encodeToString(bytesToEncode)
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It takes a byte array as input and returns an encoded string.īyte bytesToEncode = strToEncode.getBytes() Next, we will use the encodeToString() method. We will use the getEncoder() method that returns a simple Base64.Encoder.Īs discussed, this encoder uses the Basic type base64 encoding scheme. It will not add any line separators to the encoded string. The Basic encoder uses the Base64 Alphabet for encoding and decoding. In this tutorial, we will learn Base64 encoding and decoding using the 64 class and the Apache Commons library. This class supports three types of Base64 encoding - Basic, URL, and Filename Safe, and MIME. The Base64 class is part of java.util class and provides static methods for Base64 encoding and decoding scheme.