hex字符串、byte[]數組互相轉換

 1     //byte[]轉hex字符串
 2     public static String bytes2HexString(byte[] array) {
 3         StringBuilder builder = new StringBuilder();
 4 
 5         for (byte b : array) {
 6             String hex = Integer.toHexString(b & 0xFF);
 7             if (hex.length() == 1) {
 8                 hex = '0' + hex;
 9             }
10             builder.append(hex);
11         }
12 
13         return builder.toString().toUpperCase();
14     }
15 
16     //hex字符串轉byte[]數組
17     public static byte[] hexToByteArray(byte mode, String hex)
18     {
19         hex = hex.replaceAll("\\s*", ""); //去除空格等字符
20         int len = hex.length(); //字符串長度
21         hex = len % 2 == 0 ? hex : hex + "N"; //保持長度為偶數//或減一位
22         //重新計算長度
23         len = hex.length();
24         int bts_len = (len / 2 + 3); //總字節數，增加3字節
25         byte[] data = new byte[bts_len];
26         data[0] = DATA_FLAG;
27         data[1] = mode; //模式標志
28         for (int i = 0; i < len; i += 2)
29         {
30             data[i / 2 + 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4)
31                     + Character.digit(hex.charAt(i + 1), 16));
32         }
33         data[bts_len - 1] = DATA_FLAG;
34 
35         //輸出查看
36         Log.d(TAG, bytes2HexString(data));
37 
38         return data;
39     }