How to convert a bytearrayinputstream to byte in Java?

1 year ago
Emily Johnson
1 minute

In Java, you can utilize ByteArrayInputStream and ByteArrayOutputStream to convert byte arrays.

You can achieve this by following the steps below:

  1. Create a ByteArrayInputStream object and pass the byte array to be converted as a parameter to it.
  2. Create a byte array to store the data read from the ByteArrayInputStream.
  3. Use the read() method of ByteArrayOutputStream to read data from a ByteArrayInputStream and store it in a byte array.
  4. Close the ByteArrayInputStream.

The following is a sample code:

byte[] byteArray = {1, 2, 3, 4, 5};

ByteArrayInputStream inputStream = new ByteArrayInputStream(byteArray);

byte[] result = new byte[byteArray.length];

int bytesRead;
int offset = 0;

while ((bytesRead = inputStream.read(result, offset, result.length - offset)) != -1) {
    offset += bytesRead;
}

inputStream.close();

In the example above, the byte array byteArray is converted into a ByteArrayInputStream object. The data is then read from the ByteArrayInputStream using the read() method of ByteArrayOutputStream and stored in the result byte array.

Finally, close the ByteArrayInputStream object.

Note: In this example, it is assumed that the size of the byte array byteArray has already been determined. If unsure, you can use ByteArrayOutputStream to dynamically allocate the required space.

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