Interpretation of the technical principle of Base64 framework in the Java class library

Base64 is one of the coding framework commonly used in the Java library. It can represent and transmit binary data in the form of readable ASCII characters.This article will interpret the technical principles of the Base64 framework and provide some Java code examples. 1. Base64 coding principle: Base64 encoding is an encoding method that converts binary data to ASCII characters.It encodes the binary data of every 3 bytes into 4 printed characters, that is, each character accounts for 6 ratio.If the number of data bytes to be encoded cannot be removed by 3, 1 or 2 additional characters will be filled at the end to ensure that the code length of the encoding is 4.Because the base64 encoding only uses printed characters, you can avoid garbled or special characters during the transmission process. 2. Base64 encoding table: The Base64 encoding table contains 64 characters, namely A-Z, A-Z, 0-9, and "+" and "/".The order order in the encoding table corresponds to its ASCII code. 3. Base64 encoding process: The process of base64 encoding can be divided into the following steps: -Primily divide the original data into a group of blocks every 3 bytes. -Slin each 3 byte block into 4 6 -bit Biggong blocks. -Mamon the corresponding characters in the Base64 encoding table. -If the number of primitive data bytes cannot be removed by 3, add appropriate amount of filling characters at the end of the coding data. 4. Base64 library in Java: Java provides Java.util.base64 libraries for Base64 encoding and decoding.This type of library provides a static method to perform the encoding and decoding operation of Base64, such as: import java.util.Base64; public class Base64Example { public static void main(String[] args) { // String to be coded String originalText = "Hello, World!"; // Perform the base64 encoding String encodedText = Base64.getEncoder().encodeToString(originalText.getBytes()); System.out.println(encodedText); // Perform the base64 decoding byte[] decodedBytes = Base64.getDecoder().decode(encodedText); String decodedText = new String(decodedBytes); System.out.println(decodedText); } } In the above code, we used the Base64 library to the strings "Hello, World!" "Base64 encoding, and restored it to the original string through decoding operation. In summary, Base64 is a encoding method for transforming binary data into printable characters.Java provides Base64 libraries, which can easily perform Base64 encoding and decoding operations.Using Base64 encoding can avoid the problem of garbled or special characters during the data transmission process, which is suitable for a variety of application scenarios.