Convert Outputstream to file

Question

Well i'm stucked with a problem,

I need to create a PDF with a html source and i did this way:

File pdf = new File("/home/wrk/relatorio.pdf");
OutputStream out = new FileOutputStream(pdf);
InputStream input = new ByteArrayInputStream(build.toString().getBytes());//Build is a StringBuilder obj
Tidy tidy = new Tidy();
Document doc = tidy.parseDOM(input, null);
ITextRenderer renderer = new ITextRenderer();
renderer.setDocument(doc, null);
renderer.layout();
renderer.createPDF(out);
out.flush();
out.close();

well i'm using JSP so i need to download this file to the user not write in the server...

How do I transform this Outputstream output to a file in the java without write this file in hard drive ?

You want to write to a file and not have this file on hard drive? I don't get your question — Tala, Jul 05 '13 at 11:29
http://stackoverflow.com/questions/9268165/itext-generating-files-on-the-fly-without-needing-a-pdf-file/9296669#9296669 — rickz, Jul 05 '13 at 14:46

score 2 · Accepted Answer · answered Apr 19 '15 at 16:41

If you're using VRaptor 3.3.0+ you can use the ByteArrayDownload class. Starting with your code, you can use this:

@Path("/download-relatorio")
public Download download() {
    // Everything will be stored into this OutputStream
    ByteArrayOutputStream out = new ByteArrayOutputStream();

    InputStream input = new ByteArrayInputStream(build.toString().getBytes());
    Tidy tidy = new Tidy();
    Document doc = tidy.parseDOM(input, null);
    ITextRenderer renderer = new ITextRenderer();
    renderer.setDocument(doc, null);
    renderer.layout();
    renderer.createPDF(out);
    out.flush();
    out.close();

    // Now that you have finished, return a new ByteArrayDownload()
    // The 2nd and 3rd parameters are the Content-Type and File Name
    // (which will be shown to the end-user)
    return new ByteArrayDownload(out.toByteArray(), "application/pdf", "Relatorio.pdf");
}

score 0 · Answer 2 · edited May 23 '17 at 12:09

0

A File object does not actually hold the data but delegates all operations to the file system (see this discussion). You could, however, create a temporary file using File.createTempFile. Also look here for a possible alternative without using a File object.

edited May 23 '17 at 12:09

Community

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answered Jul 05 '13 at 11:46

Michael Lang

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score -1 · Answer 3 · answered Apr 04 '15 at 10:34

use temporary files.

File temp = File.createTempFile(prefix ,suffix);

prefix -- The prefix string defines the files name; must be at least three characters long.

suffix -- The suffix string defines the file's extension; if null the suffix ".tmp" will be used.

Convert Outputstream to file

3 Answers3