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Jimmy
Writing to and reading from a binary file in java.
0 Answer(s)      6 months and 25 days ago
Posted in : Java Beginners


I have written the following code to convert an ASCII text file to a binary file:

public static void main(String args[]){
 DataOutputStream dos = null; Scanner input = null;          
try{
         dos = new DataOutputStream(new FileOutputStream("zipbinary.txt"));
         input = new Scanner(new BufferedReader(new FileReader("zipcode.txt")));
     int zip = 0; double lat = 0; double longt = 0;
    while (input.hasNext()){                     
                      zip = input.nextInt(); 
                  lat = input.nextDouble();
                  longt = input.nextDouble();
                  dos.writeChar(zip);
              dos.writeChar('\t');
              dos.writeDouble(lat);
              dos.writeChar('\t');
              dos.writeDouble(longt);
              dos.writeChar('\n');
     }

I read the binary file from another program as follows:

m_dis = new DataInputStream(new BufferedInputStream(new FileInputStream(m_ZipPath)));
       while (m_dis.available() != 0){
             zipcode = m_dis.readChar();
             String zip = String.valueOf(zipcode);
             m_dis.readChar(); // throws out the tab
             m_dblLat2 = m_dis.readDouble();
             m_dis.readChar(); // throws out the tab
             m_dblLong2 = m_dis.readDouble();
            }
             m_dis.close();

There are 85,000 records in the text file all having the format: 00501 40.815400 -73.045600. The entries I get in the binary file are as follows:

o @Dh -o"F ARBeC Y J3/4j3{ @22^e (system gibberish).

It does work, but the records obtained after reading the binary file are much less than those in the text file. And I get an EOFException at code: mdblLat2 = mdis.readDouble();

I do not know what I am doing wrong. Any help appreciated.


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