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org.apache.commons.codec.binary.BinaryCodec Example
What is org.apache.commons.codec.binary.BinaryCodec class? How to use org.apache.commons.codec.binary.BinaryCodec class?
✍: FYIcenter.com
org.apache.commons.codec.binary.BinaryCodec class is a Java class offered in commons-codec.jar that converts between byte arrays and strings of "0"s and "1"s.
Two commonly used instance methods in org.apache.commons.codec.binary.BinaryCodec class are:
1. The encoding method:
public byte[] encode(byte[] raw) Converts an array of raw binary data into an array of ASCII 0 and 1 characters. The last byte from the input is converted into 8 bytes first. Parameters: raw - the raw binary data to convert Returns: 0 and 1 ASCII character bytes, one for each bit of the argument.
2. The decoding method:
public byte[] decode(byte[] ascii) Decodes a byte array where each byte represents an ASCII '0' or '1'. The last 8 bytes from the input is converted into 1 byte first. Parameters: ascii - each byte represents an ASCII '0' or '1' Returns: the raw encoded binary where each bit corresponds to a byte in the byte array argument
Here is a simple example of org.apache.commons.codec.binary.Base64 class:
// Copyright (c) 2016 FYIcenter.com import org.apache.commons.codec.binary.BinaryCodec; // Example of using the BinaryCodec class public class BinaryCodecExample { public static void main(String[] args) throws Exception { BinaryCodec codec = new BinaryCodec(); System.out.println("BinaryCodec encode() Example:"); byte[] inputBytes = new byte[4]; inputBytes[0] = (byte) 0xff; inputBytes[1] = (byte) 0xf0; inputBytes[2] = (byte) 0x0f; inputBytes[3] = (byte) 0x00; byte[] outputBytes = codec.encode(inputBytes); String outputString = new String(outputBytes,"UTF8"); String expectedString = "00000000000011111111000011111111"; System.out.println(" Input bytes: "+(inputBytes[0]&0xff) +", "+(inputBytes[1]&0xff) +", "+(inputBytes[2]&0xff) +", "+(inputBytes[3]&0xff)); System.out.println(" Encoded string: "+outputString); System.out.println(" Expected string: "+expectedString); System.out.println("BinaryCodec decode() Example:"); String inputString = "00000000000011111111000011111111"; inputBytes = inputString.getBytes("UTF8"); outputBytes = codec.decode(inputBytes); System.out.println(" Input string: "+inputString); System.out.println(" Encoded bytes: "+(outputBytes[0]&0xff) +", "+(outputBytes[1]&0xff) +", "+(outputBytes[2]&0xff) +", "+(outputBytes[3]&0xff)); } }
You can compile and run the above example in a command window as shown below:
C:\fyicenter>\local\jdk-1.8.0\bin\javac -cp C:\local\commons-codec-1.10\commons-codec-1.10.jar BinaryCodecExample.java C:\fyicenter>\local\jdk-1.8.0\bin\java -cp .;C:\local\commons-codec-1.10\commons-codec-1.10.jar BinaryCodecExample BinaryCodec encode() Example: Input bytes: 255, 240, 15, 0 Encoded string: 00000000000011111111000011111111 Expected string: 00000000000011111111000011111111 BinaryCodec decode() Example: Input string: 00000000000011111111000011111111 Encoded bytes: 255, 240, 15, 0
⇒ org.apache.commons.codec.binary.Hex Example
⇐ org.apache.commons.codec.binary.Base64 Example
2017-04-08, 1856🔥, 0💬
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