write to a file

[Jay Brass]

Hey there,
If I use this:

DataInputStream din = new DataInputStream(System.in);
din.readChar();

how do I put the readChar bit into a file and save it for a rainy day? Or can I? I don't have a gui interface so I can't use getText() I just want what the user types in up until the user presses enter.
Thx in advance
J

[Anonymous]

If you want to capture an entire line of input you might consider wrapping a BufferedReader around your existing reader and using the readLine() method to capture input. Then you can store the input in a string and do with it as you please. That would look something like this:

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String lineOfText;
lineOfText = br.readLine();

To write the string to a file, you will need to open an outputStream and a writer to the file and then pass the string to the writer.

[Jay Brass]

Bodie - Dude,
Thanks a heap
It took a whole nite of typing and trying things while downloading as much as possible from napster.
But I finally got it to work. I couldn't however, get the writer bit to work. Here is what my code looks like PLEASE feel free to point out better ways or critism or mercilously mock it as you wish:

import java.io.*;
public class Fos{
private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
public void amethod(){
try{
String lineOfText;
lineOfText = br.readLine();
FileOutputStream fis = new FileOutputStream("jay.txt");
DataOutputStream dis = new DataOutputStream(fis);
dis.writeUTF(lineOfText);
}catch(IOException ioe) {System.err.println("Error in input: " + ioe);}
    }

public void fismethod(){
try{
FileInputStream fis = new FileInputStream("jay.txt");
DataInputStream dis = new DataInputStream(fis);
while (true){
String c = dis.readUTF();
System.out.println(c);
}
}catch (FileNotFoundException fnfe){System.out.println("File not found");}
catch (IOException e) {System.out.println("Error retrieving file");}
}

public static void main(String agrv[]){
System.out.println("Input a string:");
Fos fos = new Fos();
Fos fis = new Fos();
fos.amethod();
fis.fismethod();
}
}

It ain't pretty but it works!
again thx
J

[Anonymous]

Jay, your code looked pretty good. I made some changes (most were stylistic) and got it to work. The problem that I seem to have with writing to files is that Windows NT doesn't recognize filenames as being relative. I have to specify a full path. If I don't, the file stream doesn't get created. There is probably something you can do with the string to indicate that it is relative to your JVM, but I don't really know what that would be, so I always give a full path and filename.
Anyway! Try this:

import java.io.*;
Public class Test{
    String lineOfText;
    public void amethod(){
        try{
            BufferedReader br = new BufferedReader(
                new InputStreamReader(System.in));
            lineOfText = br.readLine();
            br.close();
            BufferedWriter bw = new BufferedWriter(
                new OutputStreamWriter(new FileOutputStream("c:\\jay.txt")));
            bw.write(lineOfText);
            bw.close();
        }
        catch(IOException ioe){
            System.err.println("Error in input: " + ioe);
        }    
    }
    public void fismethod(){
        try{
            BufferedReader br = new BufferedReader(new InputStreamReader(
                new FileInputStream("C:\\jay.txt")));
            while((lineOfText=br.readLine())!=null){
                System.out.println(lineOfText);
            }
            br.close();
        }
        catch (IOException e){
            System.out.println("File I/O error");
        }
    }
        public static void main(String agrv[]){
            System.out.println("Input a string:");
            Test myTest = new Test();
            myTest.amethod();
            myTest.fismethod();
        }
    }

I hope this helps.