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字节数组 与 十六进制间的转换

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package com.test;
import java.util.Arrays;
public class Bytes {
	private final static byte[] hex = "0123456789ABCDEF".getBytes();
	private static int parse(char c) {
		if (c >= 'a')
			return (c - 'a' + 10) & 0x0f;
		if (c >= 'A')
			return (c - 'A' + 10) & 0x0f;
		return (c - '0') & 0x0f;
	}
	// 从字节数组到十六进制字符串转换
	public static String Bytes2HexString(byte[] b) {
		byte[] buff = new byte[2 * b.length];
		for (int i = 0; i < b.length; i++) {
			buff[2 * i] = hex[(b[i] >> 4) & 0x0f];
			buff[2 * i + 1] = hex[b[i] & 0x0f];
		}
		return new String(buff);
	}
	// 从十六进制字符串到字节数组转换
	public static byte[] HexString2Bytes(String hexstr) {
		byte[] b = new byte[hexstr.length() / 2];
		int j = 0;
		for (int i = 0; i < b.length; i++) {
			char c0 = hexstr.charAt(j++);
			char c1 = hexstr.charAt(j++);
			b[i] = (byte) ((parse(c0) << 4) | parse(c1));
		}
		return b;
	}
	public static void main(String[] args) {
		byte[] bt = new byte[]{10, 2, 12, 14, 1, 0, 0, 1, 0, 31, 45, 1, 8, 0, 1, 0, -96, -45, 10, 3};
		System.out.println(Bytes2HexString(bt));
		System.out.println(Arrays.toString(HexString2Bytes("0A020C0E01000001001F2D0108000100A0D30A03")));
	}
}

 

打印结果:

0A020C0E01000001001F2D0108000100A0D30A03
[10, 2, 12, 14, 1, 0, 0, 1, 0, 31, 45, 1, 8, 0, 1, 0, -96, -45, 10, 3]

 

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