Convert Inputstream from an UploadedFile from Primefaces to a String

Question

Iam trying to save an InputStream from Primefaces UploadedFile into a String. The reason for this is, that I cant figure out how to persist an inputstream with hibernate.

Following Code is given:

public String saveDocumentInDatabase(final UploadedFile pFile) throws IOException{
    InputStream inputStream = pFile.getInputstream();

    byte[] buffer = new byte[8192];
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    int bytesRead;
    while ((bytesRead = inputStream.read(buffer)) != -1)
    {
        baos.write(buffer, 0, bytesRead);
    }
    byte[] tmp = baos.toByteArray();
    return new String(tmp, StandardCharsets.UTF_8);
}


public StreamedContent downloadUploadedFile(final JoinExam pJoinExam){
    assertNotNull(pJoinExam.getSavedDocument());

    String tmp = pJoinExam.getSavedDocument().trim();
    java.io.InputStream inputStream = null;
    try {
        inputStream = new ByteArrayInputStream(tmp.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException ex) {
        ex.printStackTrace(System.err);
    }

    return new DefaultStreamedContent(inputStream, "application/pdf",
            "Protocol" + pJoinExam.getPruefling().getMatrNr()+ ".pdf");
}

In my JoinExam I have following Attribute.

@Lob
@Column
private String savedDocument;

My Attention is to save the uploadedFile´s inputStream into my String savedDocument, which should "represent" my uploaded File. When I want to download my "uploaded File" I want to get my savedDocument String and convert it back an inputStream. The achieved inputStream will be used to create an DefaultStreamedContent so I can download the File with primefaces <p:fileDownload /> -Tag.

My problem is, that the inputstream seems to lose some data while converting into a String or the String seems to loose some data while converting back to the inputstream. When I download the File and try to open it, an error pops up, saying that the filed could not be opened.

Thank you for any adivce

EDIT: When I upload and download .txt-Files it works, but it is not working with pdf-Files.

So it effectively is not a PrimeFaces issue? – Kukeltje Mar 11 '18 at 07:56 — Kukeltje, Mar 11 '18 at 07:56

score 1 · Accepted Answer · answered Mar 10 '18 at 23:22

1

Are you sure that you can store a PDF content into a @Lob String field? PDF is a binary file and those are usually handled with @Lob byte[] field. Error saying that the file could not be opened implies that it was corrupted.

answered Mar 10 '18 at 23:22

Karol Dowbecki

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is it possible to persist an byte[] attribute with hibernate ? – sergeantSalty Mar 10 '18 at 23:27
@sergeantSalty yes but it also depends on the database e.g. Oracle has both `CLOB` and `BLOB` fields. See https://stackoverflow.com/a/3739047/1602555 for more information. – Karol Dowbecki Mar 10 '18 at 23:28
Thank you guys it is working perfectly with the byteArray ! – sergeantSalty Mar 10 '18 at 23:52

Convert Inputstream from an UploadedFile from Primefaces to a String

1 Answers1