/*
Read file using FileInputStream
This example shows how to read a file using Java FileInputStream class.
FileInputStream is used to read binary content of the file and
return bytes of data.
*/
import java.io.*;
public class ReadStringFromFile {
public static void main(String[] args) {
//create file object
File file = new File("C://FileIO//ReadString.txt");
int ch;
StringBuffer strContent = new StringBuffer("");
FileInputStream fin = null;
try
{
/*
* Create new FileInputStream object. Constructor of FileInputStream throws
* FileNotFoundException if the agrument File does not exist.
*/
fin = new FileInputStream(file);
/*
* To read bytes from stream use,
* int read() method of FileInputStream class.
*
* This method reads a byte from stream. This method returns next byte of data
* from file or -1 if the end of the file is reached.
*
* Read method throws IOException in case of any IO errors.
*/
while( (ch = fin.read()) != -1)
strContent.append((char)ch);
/*
* To close the FileInputStream, use
* void close() method of FileInputStream class.
*
* close method also throws IOException.
*/
fin.close();
}
catch(FileNotFoundException e)
{
System.out.println("File " + file.getAbsolutePath() +
" could not be found on filesystem");
}
catch(IOException ioe)
{
System.out.println("Exception while reading the file" + ioe);
}
System.out.println("File contents :");
System.out.println(strContent);
/*
* Please note that, FileInputStream SHOULD NOT BE USED to read
* character data file.
* It is meant for reading binary data such as an image file.
*
* To read character data, FileReader should be used.
*/
}
}
/*
Output would be
File contents :
This file is a demonstration of how to read a file using Java FileInputStream.
*/
