How to use FileInputStream in Java?

1 year ago
Sophia Anderson
2 minutes

In Java, you can use the FileInputStream class to read the contents of a file. The general steps for using FileInputStream are as follows:

  1. Instantiate a FileInputStream object by passing the file path to be read as a parameter. For example:
  2. Create a FileInputStream to read from the file path.
  3. Create a byte array to store the data read from a file. For example:
  4. Create an array called buffer with a length of 1024 bytes.
  5. Reading file content using the read method of FileInputStream and storing the read data in a byte array. The read method returns the number of bytes read, and if it returns -1, it indicates that the end of the file has been reached. For example:
  6. The variable “bytesRead” stores the value returned by the method “fis.read(buffer)”.
  7. Utilize a while loop to continuously read the file content until reaching the end of the file. For example:
  8. Continue reading the next part of data until no more bytes are read.
  9. Handle the read data within the loop. For example, you can convert the read data to a string and print it out.
  10. Create a new string by converting the data read from the buffer, and then print it.
  11. After reading the contents of the file, it is necessary to close the FileInputStream to release resources. For example:
  12. Close the file input stream.

Note: When using FileInputStream to read a file, it is necessary to handle IOException.

bannerAds