Java Fundamentals Hardening IO Stream Note 21:fileinputstream reading data

1. Operation steps for byte input stream:

(1) Create a byte input stream object

(2) Call the Read () method and display the data to the console

(3) Close the object resource of the byte input stream

2. FileInputStream Construction:

FileInputStream(File file) Constructs a new FileInputStream based on file .

FileInputStream(FileDescriptor fd) Constructs a new on the FileInputStream FileDescriptor fd .

FileInputStream(String fileName) Constructs a new on the FileInputStream file named fileName .

3. code example:

1  PackageCom.himi.fileinputstream;2 3 ImportJava.io.FileInputStream;4 Importjava.io.IOException;5 6 /*7 * How to read data:8 * int Read (): read one byte at a time9 * int read (byte[] b): One reads a byte arrayTen  */ One  Public classFileinputstreamdemo { A  -      Public Static voidMain (string[] args)throwsIOException { -         //FileInputStream (String name) the         //Create a byte input stream object -FileInputStream FIS =NewFileInputStream ("Fis.txt"); -          -          +         //call the Read () method to read the data and display the data in the console -         intby = 0; +          while(by = Fis.read ())! =-1) { ASystem.out.print ((Char) by); at         } -         //Freeing Resources - fis.close (); -  -     } -  in}

The results are as follows:

Java Fundamentals Hardening IO Stream Note 21:fileinputstream reading data