First read excel as byte array, then convert this byte array to string, then convert this string to byte array again.
String fileLocation = "/tmp/a.xlsx";
byte[] bytes1 = Files.readAllBytes(Paths.get(fileLocation));
String str = new String(bytes1);
byte[] bytes2 = str.getBytes();
System.out.println(Arrays.equals(bytes1, bytes2)); // false
Why bytes1 is not equals to bytes2?
When you are converting from bytes to a String
String str = new String(bytes1);
you are potentially losing non-char bytes.
As per the javadocs
The behavior of this constructor when the given bytes are not valid in the default charset is unspecified.
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