string  str = "EF256345";  （16进制数据）怎么转换成byte[] = {(byte)0xef,0x25,0x63,0x45};

1. String s = "EF256345";
   
2. byte[] bytes = new byte[s.length() / 2];
   
3. for (int i = 0; i <= s.length() - 2; i+=2)
   
4.     bytes[i / 2] = (byte)Integer.parseInt(s.substring(i, i+2), 16);
   
5. System.out.println(Arrays.toString(bytes));

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