Detailed explanation of the technical principles and applications of the Base64 framework in the Java class library

Base64 is a commonly used encoding method. It can convert binary data into text formats to facilitate data transmission and storage between different systems.The Base64 framework in the Java class library provides a complete set of codec tools, enabling developers to easily perform Base64 encoding operation. Technical principle: Base64 encodes 3 8 -bit bytes into 4 6 -bit bytes and maps them to 64 printed characters.The purpose of this is to convert binary data into text formats to facilitate transmission and storage.The process of base64 encoding is as follows: 1. Divide the binary data into one group by 3 bytes. 2. Smart 3 bytes of each group into 4 6 -bit bytes. 3. Find the base64 encoding table and convert 6 bytes into corresponding printed characters. 4. If the last group of bytes are less than 3 bytes, make up for 3 bytes, and add a special filling character "=". 5. Stimulate all coded characters together, that is, the results of Base64 encoding. The Base64 decoding is to restore the results of Base64 to the original binary data.The process of decoding is as follows: 1. Divide the base64 encoding result into one group by 4 characters. 2. Convert 4 characters in each group to the corresponding 6 -bit bytes. 3. Merge 4 6 -bit bytes into 3 8 -bit bytes and restore it into primitive binary data. application: Base64 coding has many scenarios in practical applications, such as: 1. Data transmission: In network transmission, because certain characters may be specially processed and are not suitable for direct transmission binary data.At this time, you can use Base64 to convert binary data to the text format for transmission, and the receiving end is then decoded and restored to the original data. 2. Image processing: Convert the picture to base64 encoding, which can easily embed the picture into the HTML file, thereby avoiding the loading and downloading of the picture file. 3. Password storage: Sampled sensitive information such as user passwords in the form of base64 encodes in the database, which can enhance the security of data. In Java, it is very simple to use Base64.The following is an example of Base64 tools using the Java library: import java.util.Base64; public class Base64Example { public static void main(String[] args) { String originalText = "Hello, World!"; // Code operation String encodedText = Base64.getEncoder().encodeToString(originalText.getBytes()); System.out.println ("Base64 encoding result:" + encodedtext); // Decoding operation byte[] decodedBytes = Base64.getDecoder().decode(encodedText); String decodedText = new String(decodedBytes); System.out.println ("Base64 decoding result:" + decodedtext); } } In the above example, the original text is first encoded by the original text and outputs the result.The encoding result is then decoded to the original text and outputs the decoding result. Summarize: The Base64 framework in the Java class library provides a simple and easy -to -use coding tool, enabling developers to easily perform the Base64 codec operation.Whether it is data transmission, picture processing or password storage, Base64 can provide convenient solutions.Through the Base64 codec, the conversion of binary data to text can be achieved, which facilitates the interaction and storage of data between different systems.