Java字节数组转换成十六进制字符串

Java中可以使用以下代码将字节数组转换成十六进制字符串：

public static String bytesToHex(byte[] bytes) {
    char[] hexArray = "0123456789ABCDEF".toCharArray();
    char[] hexChars = new char[bytes.length * 2];
    for (int i = 0; i < bytes.length; i++) {
        int v = bytes[i] & 0xFF;
        hexChars[i * 2] = hexArray[v >>> 4];
        hexChars[i * 2 + 1] = hexArray[v & 0x0F];
    }
    return new String(hexChars);
}

使用方法如下：

byte[] bytes = {0x12, 0x34, (byte) 0xAB, (byte) 0xCD};
String hexString = bytesToHex(bytes);
System.out.println(hexString); // output: "1234ABCDEF"