Convert fileoutputstream to a string

Question

I have a java program where I am writing to a file using OutputStream. Everything is working fine. Upon completion of the program, I see data in my file. However, I would like to see this data on the System.out as well.

How can I convert OutputStream to a String so that I can simply System.out.println(); it? I tried fos.toString() but that prints java.io.FileOutputStream@1ed2e55e

Just pass what ever data you pass to the OutputStream to write to the file to System.out.println() — inixsoftware
– inixsoftware, Commented Sep 12, 2013 at 20:08
Or after you are done writing to the file open a FileInputStream to read from the file what you have written to it - then use a BufferedReader to read it line by line and print it. This only makes sense if you want to see that your data was written correctly. — Daniel Gabriel
– Daniel Gabriel, Commented Sep 12, 2013 at 20:10
What inixsoftware said, or if the file isn't too big to read at once you could just print this out new String(Files.readAllBytes(Paths.get("file.txt")), "UTF-8"). — sgbj
– sgbj, Commented Sep 12, 2013 at 20:10
I am writing to the fos like this in a loop: fos.write((byte) mybyte) however, when I do the same to String s = (byte) mybyte i get errors — birdy
– birdy, Commented Sep 12, 2013 at 20:13
Either do System.out.print((char) mybyte); or sb.append((char) mybyte);. — sgbj
– sgbj, Commented Sep 12, 2013 at 20:21

Jim · Accepted Answer · 2016-02-09 23:09:02Z

4

Use a ByteArrayOutputStream and you can create a string from it. Assuming the 'stream' variable is a reference to your ByteArrayOutputStream in the following example, here's how you could do it...

System.out.println(new String(stream.toByteArray(), CharSet.defaultCharSet()));

EDIT: was missing a closing parenthesis above, fixed now

edited Feb 9, 2016 at 23:09

answered Sep 12, 2013 at 20:15

Jim

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1 Comment

utarid Over a year ago

you forget ) -> System.out.println(new String(stream.toByteArray(), CharSet.defaultCharSet()));

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