Java uses Apache Commons Codec to implement Hex encoding/decoding to convert binary data into hexadecimal format
Apache Commons Codec is a Java library that provides a series of encoding and decoding implementations, including Hex encoding and decoding. It is part of the Apache Commons project and can be used to manage dependencies through Apache Maven.
1. Maven coordinates:
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.15</version>
</dependency>
2. Brief introduction:
Apache Commons Codec provides a variety of encoding and decoding implementations, including hex encoding and decoding (Hex), Base64 encoding and decoding, URL encoding and decoding, HTML encoding and decoding, and so on. Hex encoding is used to convert binary data into strings in hexadecimal format, which is one of the common data conversion methods.
3. Complete sample code:
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;
public class HexExample {
public static void main(String[] args) {
byte[] binaryData = {0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x2C, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64}; // Hello, World
//Encoding: converting binary data to hexadecimal strings
String hexString = Hex.encodeHexString(binaryData);
System. out. println ("Hex encoding string:"+hexString);
//Decoding: converting hexadecimal strings to binary data
try {
byte[] decodedData = Hex.decodeHex(hexString);
String decodedString = new String(decodedData);
System. out. println ("Decoded string:"+decodedString);
} catch (DecoderException e) {
System. out. println ("Decoding failed:"+e.getMessage ());
}
}
}
4. Summary:
This article introduces how to use the Hex class of Apache Commons Codec for Hex encoding and decoding. Firstly, the dependency of Apache Commons Codec was added through Maven; Then, binary data can be encoded into hexadecimal strings through the 'encodeHexString' method of the Hex class; Finally, the hex string can be decoded into binary data through the 'decodeHex' method of the Hex class. Using Apache Commons Codec makes it easy to perform various encoding and decoding operations, which is very practical.
