(Java) EOFException when reading from a Text File

Question

I am reading two strings and a double from a text file, but keep throwing an EOFException. This is my code:

public static Book readBook(String pathname) throws IOException, FileNotFoundException{
      DataInputStream dis = new DataInputStream(
                                new BufferedInputStream(
                                    new FileInputStream(fn)));
      String theTitle = dis.readUTF();
      String theAuthor = dis.readUTF();
      double thePrice = dis.readInt();
      dis.close();
      return new Book(theTitle, theAuthor, thePrice);
   }

Im really quite new to IO and have no idea on how to solve this exception, and throwing EOFExecption doesn't seem to work. Any help would be greatly appreciated, Cheers

EDIT: Stack Trace + File Contents

Exception in thread "main" java.io.EOFException
    at java.io.DataInputStream.readFully(Unknown Source)
    at java.io.DataInputStream.readUTF(Unknown Source)
    at java.io.DataInputStream.readUTF(Unknown Source)
    at Model.readBook(Model.java:48)
    at Model.runApp(Model.java:17)
    at Main.main(Main.java:8)

File Contents

name author 10.00 name2 author2 12.00

(In file they are all on seperate lines)

Which line is throwing the exception? What is the message? Are any of your variables being filled in properly? — unholysampler, Feb 20 '13 at 18:04
ahh ok the text file is pre-written with what you see above. the writing portion is in another class and surprisingly works fine — Kamon241, Feb 20 '13 at 18:39
Either this is not a text file or you are using the wrong API. A text file does not contain the output of `readInt(), readUTF()`, etc. — user207421, Apr 05 '17 at 09:52

score 1 · Accepted Answer · answered Feb 20 '13 at 18:10

1

If this is text file, then you probably need to use Scanner:

Scanner scanner = new Scanner (new FileInputStream (fn));
String theTitle = scanner.nextLine ();
String theAuthor = scanner.nextLine ();
double thePrice = scanner.nextDouble ();
return new Book(theTitle, theAuthor, thePrice);

The code above expects title, author and price to be on separate lines.

answered Feb 20 '13 at 18:10

Mikhail Vladimirov

13,572
1
38
40

This is definitely the simplier way to accomplish reading a plain text file. I'd also suggest to @Kamon241 to put each book entry on a new line. – aglassman Feb 20 '13 at 18:12
Cheers guys, testing it now – Kamon241 Feb 20 '13 at 18:14

score 0 · Answer 2 · answered Feb 20 '13 at 18:04

How is your text input formatted? Are you specifying the length of the strings to read in the input? My thinking is that you did not, or specified the length wrong, and are hitting the end of the file before on one of the subsequent reads.

First, two bytes are read and used to construct an unsigned 16-bit integer in exactly the manner of the readUnsignedShort method . This integer value is called the UTF length and specifies the number of additional bytes to be read.

http://docs.oracle.com/javase/6/docs/api/java/io/DataInput.html#readUTF()

score 0 · Answer 3 · answered Feb 21 '13 at 00:20

I am reading two strings and a double from a text file

No you aren't. You are reading two writeUTF() results and an integer from a binary file. If it isn't a binary file, you are using the wrong code. You need to read the file line by line, split each line probably on the spaces, and parse the double using Double.parseDouble(). Or, use java.util.Scanner to make the whole thing easier.

(Java) EOFException when reading from a Text File

3 Answers3