Something similar to FileCopyUtils.copy method in basic Java

Question

I am trying to generate a pdf in my application.

I have used the following in a previous project to copy the byte array to the outputstream.

FileCopyUtils.copy(fileContent, response.getOutputStream());

In my current project we are not using spring framework. So I cannot use FileCopyUtils here. Is there any other way to do the similar thing in simple basic java.

See also [Standard concise way to copy a file in Java?](http://stackoverflow.com/questions/106770/standard-concise-way-to-copy-a-file-in-java) — Raedwald, Aug 27 '15 at 10:09

score 2 · Answer 1 · answered Aug 27 '15 at 09:48

2

Class java.nio.file.Files contains several utility methods to copy files (new since Java 7).

For example:

Path path = Paths.get("C:\\Somewhere\\Somefile.txt");

Files.copy(path, response.getOutputStream());

answered Aug 27 '15 at 09:48

Jesper

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does this actually do the trick? I just need to copy the converted pdf byte array. It is not a file loaded from any location. – Philip John Aug 27 '15 at 10:13

score 2 · Accepted Answer · answered Aug 27 '15 at 09:49

2

To write a byte array to an OutputStream, call its write method:

response.getOutputStream().write(fileContent);

No helper methods required.

answered Aug 27 '15 at 09:49

user253751

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score 0 · Answer 3 · answered Aug 27 '15 at 09:50

If you really must do it yourself (I would strongly recommend you do not) then something like this should work.

public static void copy(Reader in, Writer out) throws IOException {
  final char[] buffer = new char[4096];
  int read;
  do {
    read = in.read(buffer, 0, buffer.length);
    if (read > 0) {
      out.write(buffer, 0, read);
    }
  } while (read >= 0);
}

Something similar to FileCopyUtils.copy method in basic Java

3 Answers3