Java Buffered Stream
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  1. #1
    Member
    Join Date
    Sep 2007
    Posts
    51

    Lightbulb Java Buffered Stream

    Hi Guys,

    i have written the following piece of code. and although it compiles and does not throw an exception, when executed. it creates the file for the buffered output stream, but when i open the output file it is empty and no data has been written to it.

    Code:
    import java.io.*;
    
    public class FileReader{
    	public static void main(String[] args) throws Exception{
    		String strFrmFile=args[0];
    		String strToFile="/Users/me/Desktop/FileReader/"+args[1];
    
    		byte bytBuf[]=new byte[1024];
    		int intOfst=0;
    		int intBytRd=0;
    
    		BufferedInputStream bis=new BufferedInputStream(new FileInputStream(strFrmFile));
    		BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(strToFile));
    
    		intBytRd=bis.read(bytBuf,0,1024);
    
    		while(!(intBytRd<0)){
    			bos.write(bytBuf,0,intBytRd);
    			intOfst+=intBytRd;
    
    			intBytRd=bis.read(bytBuf,0,1024);
    		}
    
    		System.out.println("FileReader: "+strFrmFile+" copied to "+strToFile);
    	}
    }
    admittedly, i thought that i understood what the second argument of the read() and write() methods (i.e. the offset parameters) were for, but now I am not so sure, so i might not be using them correctly. i would be very greatful for any help.


    thanks in advance,

    - user0182

  2. #2
    Custom User
    Join Date
    Oct 2001
    Posts
    503
    I would imagine that you are calling read() and write() correctly (although I've not bothered checking). What you appear to be missing is a call to close(). If you don't close the file, it won't actually write anything to it (I think).

    I'm sure that one caught me a few times when I first did file writing.

    Cheers,
    ac

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