@Override
public void handleResourceRequest(FacesContext context) throws IOException {
Resource resource = createResource(context);
if (resource == null) {
super.handleResourceRequest(context);
return;
}
ExternalContext externalContext = context.getExternalContext();
if (!resource.userAgentNeedsUpdate(context)) {
externalContext.setResponseStatus(SC_NOT_MODIFIED);
return;
}
InputStream inputStream = resource.getInputStream();
if (inputStream == null) {
externalContext.setResponseStatus(SC_NOT_FOUND);
return;
}
externalContext.setResponseContentType(resource.getContentType());
for (Entry<String, String> header : resource.getResponseHeaders().entrySet()) {
externalContext.setResponseHeader(header.getKey(), header.getValue());
}
stream(inputStream, externalContext.getResponseOutputStream());
}
/**
* Crea un archivo para que pueda ser descargado en el navegador, debe previamente existir el path
* de archivo
*
* @param path
*/
public void crearArchivo(String path) {
FacesContext facesContext = FacesContext.getCurrentInstance();
StreamedContent content;
InputStream stream = null;
try {
if (path.startsWith("/")) {
stream =
((ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext())
.getResourceAsStream(path);
} else {
stream = new FileInputStream(path);
}
} catch (Exception e) {
crearError("No se puede generar el archivo path: " + path, "crearArchivo()", e);
}
if (stream == null) {
return;
}
content = new DefaultStreamedContent(stream);
if (content == null) {
return;
}
ExternalContext externalContext = facesContext.getExternalContext();
String contentDispositionValue = "attachment";
try {
externalContext.setResponseContentType(content.getContentType());
externalContext.setResponseHeader(
"Content-Disposition",
contentDispositionValue
+ ";filename=\""
+ path.substring(path.lastIndexOf("/") + 1)
+ "\"");
externalContext.addResponseCookie(
Constants.DOWNLOAD_COOKIE, "true", new HashMap<String, Object>());
byte[] buffer = new byte[2048];
int length;
InputStream inputStream = content.getStream();
OutputStream outputStream = externalContext.getResponseOutputStream();
while ((length = (inputStream.read(buffer))) != -1) {
outputStream.write(buffer, 0, length);
}
externalContext.setResponseStatus(200);
externalContext.responseFlushBuffer();
content.getStream().close();
facesContext.getApplication().getStateManager().saveView(facesContext);
facesContext.responseComplete();
} catch (Exception e) {
crearError("No se puede descargar : path: " + path, "crearArchivo()", e);
}
}