Application of encryption and solid algorithms provided by Base64 framework in the Java class library

Base64 is an algorithm for coding when transmitting or storage data.It converts binary data into a form of text for transmission and processing.In the Java library, the Base64 framework provides algorithms for encryption and decryption data.This article will introduce the basic principles of Base64, and provide some examples of encryption and decryption in Java using the Base64 framework in Java. 1. Basic principles of Base64 The Base64 algorithm encodes any binary data in accordance with certain rules to generate a text form that contains only printed characters.The coding rule is to use 3 bytes (3 × 8 = 24 bits) as a group, and then convert these 3 bytes into 4 base64 characters.If the data is less than 3 bytes, the algorithm will be filled.Therefore, the data length of the base64 is always 4/3 times the length of the original data (if the number of bytes is not a multiples of 3, it will be filled). The base64 encoding table consists of 64 characters, including 26 capital letters, 26 lowercase letters, 10 numbers and 2 special characters "+" and "/".The encoding process is to split each byte into 6 bits and map it to the corresponding base64 character.The decoding is to restore the Base64 character into binary data. In the Java class library, the Base64 framework provides the class and methods of implementing this algorithm, making the encryption and decryption operations easy to use. 2. The application of Base64 in Java In the Java class library, the Java.util.Base64 category provides support for the Base64 algorithm.It contains a series of static methods that can be used to encode and decoding data.Here are some commonly used methods: 1. Code method -ENCODETISTRING (byte [] SRC): Code the given byte array and return a string. -Geturlencoder (): Returns a Base64 encoder for URL security. -GetmimeEncoder (): Returns a MIME (Multipurpose Internet Mail Extensions) Base64 encoder for transmitting binary data in the mail. 2. Decoding method -Code (String SRC): Decoding the given Base64 encoding string into the original byte array. -GetuRLDECODER (): Returns a Base64 decoder for URL security. -GetmimeDeCod (): Return a MIME (Multipurpose Internet Mail Extensions) Base64 decoder. Here are some application examples of Base64 in Java: // base64 encoding example import java.util.Base64; // Code string String originalString = "Hello World!"; String encodedString = Base64.getEncoder().encodeToString(originalString.getBytes()); System.out.println ("Base64 encoded string:" + EncodedString); // Decoding strings String decodedString = new String(Base64.getDecoder().decode(encodedString)); System.out.println ("decoded string:" + decodedstring); In this code, the string "Hello World!" First encoded the Base64 and print the coding results.Then, the coded string is decoded and the decoding results are printed.Run the code, the output result is as follows: Base64 encoded string: SGVSBG8GV29ybgqh Decoding string: Hello World! Summarize The Base64 framework provides a convenient way to encrypt and decrypt data in Java.Through the base64 encoding, binary data can be converted into printed string forms for easy transmission and processing.In the Java class library, the Base64 algorithm is supported by the Java.util.base64, which contains various methods for coding and decoding.Use the Base64 framework to easily implement data encryption and decryption operations.