package com.base;

public class ComFn {
	public static String bytesToHexString(byte[] src, int len){
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || len <= 0) {
            return null;
        }
        for (int i = 0; i < len; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v).toUpperCase();
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv + " ");
        }
        return stringBuilder.toString();
    }
	
	/**
     * 16½øÖÆ×Ö·û´® ת»»Îª¶ÔÓ¦µÄ byteÊý×é
     */
    public static byte[] hex2Bytes(String hex) {
        if (hex == null || hex.length() == 0) {
            return null;
        }

        char[] hexChars = hex.toCharArray();
        byte[] bytes = new byte[hexChars.length / 2];   // Èç¹û hex ÖеÄ×Ö·û²»ÊÇżÊý¸ö, ÔòºöÂÔ×îºóÒ»¸ö

        for (int i = 0; i < bytes.length; i++) {
            bytes[i] = (byte) Integer.parseInt("" + hexChars[i * 2] + hexChars[i * 2 + 1], 16);
        }

        return bytes;
    }
}