Write data to a file from a BufferedReader?

Question

In Java...

I have data stored in a BufferedReader. (I got it as a response to an HTTP post request.)

How do I write this (binary) data to a file?

I know how to write Strings to files, but how do I take the data in the BufferedReader and put it into a file.

Thanks in advance!

What HTTP client library are you using to perform the HTTP POST? — Dilum Ranatunga, Oct 20 '11 at 02:21

score 6 · Accepted Answer · edited Jul 01 '13 at 21:24

6

Do not use a Reader to get bytes. Reader is used for reading character data, not binary data. Use the InputStream directly.

void write(InputStream is, OutputStream os) throws IOException {
    byte[] buf = new byte[512]; // optimize the size of buffer to your need
    int num;
    while ((num = is.read(buf)) != -1) {
      os.write(buf, 0, num);
    }
}

edited Jul 01 '13 at 21:24

Cacovsky

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answered Oct 20 '11 at 01:07

RHT

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Output stream is clear - I can make an FileOutputStream for that. How do I turn my BufferedReader into a InputStream? – rustybeanstalk Oct 20 '11 at 01:36
Why do you have to use a reader? Why can't you use InputStream directly to get the bytes? – RHT Oct 20 '11 at 01:49
@thehanseatic You don't turn your `BufferedReader` into an `InputStream`. You *start* with an `InputStream`. As you have binary data, using a `BufferedReader` is incorrect. – user207421 Oct 20 '11 at 04:22
Thank you very much for clearing up the confusion. I have gotten it to work using the method above. – rustybeanstalk Oct 21 '11 at 06:58

score 1 · Answer 2 · answered Oct 20 '11 at 01:07

1

Start with Basic I/O then do the i, then the o, or if you want to conserve memory i/o, i/o i/o (rinse and repeat till no more i).

answered Oct 20 '11 at 01:07

Andrew Thompson

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Write data to a file from a BufferedReader?

2 Answers2