 | Session 10 |  |
Stream buffering
Reading and writing the data is a relatively slow process. Sometimes it is not efficient to read data in small portions. Java has some more classes for reading/writing the data in large portions - BufferedInputStream and BufferedOutputStream:
InputStream sisse = new BufferedInputStream(new FileInputStream("myPicture.jpg"));
OutputStream välja = new BufferedOutputStream(new FileOutputStream("mySecondPicture.jpg"));
The buffer of BufferedInputStream has a 8KiB-byte array by default, which holds the data from the stream. This helps increase the speed of reading/writing and data processing.
Apart from the buffered byte input stream, Java has a class for reading characters using a buffer - BufferedReader. This class also looks for the lines in the buffered text:
InputStream myBytes = new FileInputStream("myInput.txt");
InputStreamReader myText = new InputStreamReader(myBytes, "UTF-8");
BufferedReader myBuffer = new BufferedReader(myText);
String myLine = myBuffer.readLine();
while (myLine != null) {
System.out.println("Line: " + myLine);
myLine = myBuffer.readLine(); // reads the next line; if there is no line, null is returned
}
myBuffer.close();
The first three lines can be shorted as follows:
BufferedReader myBufferbr = new BufferedReader(new InputStreamReader(new FileInputStream("myInput.txt"), "UTF-8"));
| Session 10 | |