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vineri, 17 aprilie 2015

[OmniFaces utilities (2.0)] Get the input stream for an application resource mapped to the specified path

[OmniFaces utilities] The getResourceAsStream() method returns an input stream for an application resource mapped to the specified path, if it exists; otherwise, return null.

See also: Faces#getContext()

For example, when you download a file, you can use Faces#getResourceAsStream(), as below:

public void readFileAction() throws IOException, URISyntaxException {
  FacesContext facesContext = FacesContext.getCurrentInstance();
  ExternalContext externalContext = facesContext.getExternalContext();
  Path path = Paths.get(externalContext.getRealPath("/resources/rafa.txt"));

  BasicFileAttributes attrs = Files.readAttributes(path, BasicFileAttributes.class);
  externalContext.setResponseContentLength((int) attrs.size());
  externalContext.setResponseHeader("Content-Disposition", "attachment; filename=\"" + "rafa.txt" + "\"");
  int nRead;
  byte[] data = new byte[128];

  InputStream inStream = Faces.getResourceAsStream("/resources/rafa.txt");

  try (OutputStream output = externalContext.getResponseOutputStream()) {
       while ((nRead =, 0, data.length)) != -1) {
               output.write(data, 0, nRead);


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