byte转hex，hex转byte

 1 /**
 2      * byte数组转hex
 3      * @param bytes
 4      * @return
 5      */
 6     public static String byteToHex(byte[] bytes){
 7         String strHex = "";
 8         StringBuilder sb = new StringBuilder("");
 9         for (int n = 0; n < bytes.length; n++) {
10             strHex = Integer.toHexString(bytes[n] & 0xFF);
11             sb.append((strHex.length() == 1) ? "0" + strHex : strHex); // 每个字节由两个字符表示，位数不够，高位补0
12         }
13         return sb.toString().trim();
14     }
15 
16 
17     /**
18      * hex转byte数组
19      * @param hex
20      * @return
21      */
22     public static byte[] hexToByte(String hex){
23         int m = 0, n = 0;
24         int byteLen = hex.length() / 2; // 每两个字符描述一个字节
25         byte[] ret = new byte[byteLen];
26         for (int i = 0; i < byteLen; i++) {
27             m = i * 2 + 1;
28             n = m + 1;
29             int intVal = Integer.decode("0x" + hex.substring(i * 2, m) + hex.substring(m, n));
30             ret[i] = Byte.valueOf((byte)intVal);
31         }
32         return ret;
33     }