Base64 encoding and decoding of data from Java. Encode and decode methods for Strings, byte arrays, and streams.

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English

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Base64 is needed in many places other than its original use as an encoding format for transferring attachments in email. It can be used anytime binary or arbitrary data needs to be represented in common printable characters. For example to connect to a web page that requires a username and password (basic authentication) you need to Base64 encode the username and password. (See the example)

Example

URL url = new URL("http://....");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setRequestProperty(
    "Authorization", 
    "Basic " + Base64.encode(
        username + ":" + password
    )
);      
InputStream in = connection.getInputStream();

Use base64 to add a basic authentication to an HTTP request.

Be aware that Base64 encoding in not encryption. Base64 scrambles the output and it may appear to be unreadable, but it is easily deciphered by anybody with a little experience or time. Base64 encoded strings will often end in one or two equal signs, and they will have only letters, numbers, pluses, and slashes. Once somebody figures out that it is in Base64, it is just a matter of running the decode method on it. Furthermore, real encryption algorithms will change the entire output if one bit in the input changes. If you change a letter in a your message and then re-encode it with Base64, only a few characters will change. Base64 is not a substitute for encryption. Base64 used this way is obfuscation, and rather poor obfuscation at that. It may be a disservice to your users to use Base64 as obfuscation because it gives them the impression that their data is encrypted when it really isn't.

Evaluation Histoire Cm1 Les Gaulois Et Les Romains Exclusive ((free)) [TOP]

Pour briller lors de cette évaluation, les élèves doivent savoir situer les événements sur une frise chronologique et ne pas confondre les peuples. Les Gaulois n'étaient pas des "barbares" sans culture, mais une société organisée qui a su intégrer le savoir-faire romain pour évoluer.

Document : Schéma d'une ville gallo-romaine (Théâtre, Forum, Thermes). À quoi servaient les thermes ?

Le conflit majeur oppose Jules César à Vercingétorix. C’est le basculement vers l’époque gallo-romaine. evaluation histoire cm1 les gaulois et les romains exclusive

Avant l'arrivée de Jules César, la Gaule n'est pas un pays unifié mais un territoire partagé par de nombreuses tribus (les Arvernes, les Éduens, etc.).

Après la conquête, les modes de vie se mélangent. C'est ce qu'on appelle la civilisation gallo-romaine. Pour briller lors de cette évaluation, les élèves

Quel bâtiment était le centre de la vie politique et commerciale ? Exercice 3 : Texte à trous (5 points)

Construction de théâtres, d'arènes, de thermes (bains publics) et d'aqueducs pour amener l'eau. À quoi servaient les thermes

La défaite finale des Gaulois. Vercingétorix se rend à César. La Gaule devient romaine. III. La Romanisation : Devenir Gallo-Romain

Un réseau de routes pavées pour faciliter le commerce et le déplacement des légions. Modèle d'Évaluation (Contrôle) Exercice 1 : Questions de cours (5 points)

"Après la défaite d’Alésia, la Gaule est divisée en provinces par les __________. Les Gaulois adoptent peu à peu la langue __________ et construisent des monuments comme les _________ pour les spectacles. On appelle cette nouvelle culture la civilisation ____________." Conseils pour réussir

Links

Author	License	Features
Stephen Ostermiller com.Ostermiller.util.Base64	Open source, GPL	Encodes and decodes strings, byte arrays, files, and streams from static methods.
Robert W. Harder Base64	Open source, public domain	Encodes and decodes strings, byte arrays, and objects from static methods. It will encode and decode streams if you instantiate a Base64.InputStream or a Base64.OutputStream.
Roedy Green Java Glossary com.mindprod.base64.base64	Open source, freeware (except military)	Encodes from byte arrays to strings, decodes from strings to byte arrays.
Tom Daley JavaWorld Tip	unknown	Annotated code and nifty graphic that shows how Base64 encoding works. Supports byte array to byte array operations.
Sinotar com.sinotar.algorithm.Base64	Open source, free only for personal use.	Encodes from byte arrays to strings, decodes from strings to byte arrays.

License

The OstermillerUtils library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.