Here's an example that shows how to read a file in java with the classes  BufferedInputStream and DataInputStream.

 
import java.io.BufferedInputStream; 
import java.io.DataInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 

public class BufferedInputStreamExample {

 public static void main(String[] args) {

 File file = new File("test.txt"); 
 FileInputStream fis = null; 
 BufferedInputStream bis = null; 
 DataInputStream dis = null; 

 try {
 fis = new FileInputStream(file); 
 bis = new BufferedInputStream(fis); 
 dis = new DataInputStream(bis); 

 while (dis.available() != 0) {
 System.out.println(dis.readLine()); 
 }

 } catch (IOException e) {
 e.printStackTrace(); 
 } finally {
 try {
 //close read streams
 fis.close(); 
 bis.close(); 
 dis.close(); 
 } catch (IOException ex) {
 ex.printStackTrace(); 
 }
 }
 }
}