Reading from a data input stream - Java File Path IO

Java examples for File Path IO:File Stream

  1. HOME
  2. Java
  3. File Path IO
  4. File Stream

Description

Reading from a data input stream

Demo Code

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.NumberFormat;

public class ReadBinaryFile {
  public static void main(String[] args) {
    NumberFormat cf = NumberFormat.getCurrencyInstance();

    DataInputStream in = getStream("movies.dat");

    boolean eof = false;
    while (!eof) {
      Movie movie = readMovie(in);// ww  w  . j a  va2  s.c o m
      if (movie == null)
        eof = true;
      else {
        String msg = Integer.toString(movie.year);
        msg += ": " + movie.title;
        msg += " (" + cf.format(movie.price) + ")";
        System.out.println(msg);
      }
    }
    closeFile(in);
  }

  private static DataInputStream getStream(String name) {
    DataInputStream in = null;
    try {
      File file = new File(name);
      in = new DataInputStream(new BufferedInputStream(new FileInputStream(file)));
    } catch (FileNotFoundException e) {
      System.out.println("The file doesn't exist.");
      System.exit(0);
    } catch (IOException e) {
      System.out.println("I/O Error creating file.");
      System.exit(0);
    }
    return in;
  }

  private static Movie readMovie(DataInputStream in) {
    String title = "";
    int year = 0;
    ;
    double price = 0.0;
    ;

    try {
      title = in.readUTF();
      year = in.readInt();
      price = in.readDouble();
    } catch (EOFException e) {
      return null;
    } catch (IOException e) {
      System.out.println("I/O Error reading file.");
      System.exit(0);
    }
    return new Movie(title, year, price);

  }

  private static void closeFile(DataInputStream in) {
    try {
      in.close();
    } catch (IOException e) {
      System.out.println("I/O Error closing file.");
      System.out.println();
    }
  }

}

class Movie {
  public String title;
  public int year;
  public double price;

  public Movie(String title, int year, double price) {
    this.title = title;
    this.year = year;
    this.price = price;
  }
}

Related Tutorials