How do I load a file or InpuStream in a portlet using Liferay?
I have a button in the UI that calls a load method file
that takes a type InpuStream
. This is my code
<p:commandButton value="Download" actionListener="#{cc.attrs.noteAndFileBean.downloadFileAttached(noteAndFile)}" />
and bean
public void downloadFileAttached(final GridFSDBFile noteAndFile)
{
try
{
PortletResponse portletResponse = (PortletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
HttpServletResponse response = PortalUtil.getHttpServletResponse(portletResponse);
response.setContentType(noteAndFile.getContentType());
response.setHeader("Content-Disposition", "attachment; filename=\"" + noteAndFile.getFilename());
response.setHeader("Content-Transfer-Encoding", "binary");
response.getOutputStream().write(IOUtils.toByteArray(noteAndFile.getInputStream()));
response.flushBuffer();
}
catch (IOException excpetion)
{
LOGGER.error("An error occurred downloading the file: " + excpetion.getMessage(), excpetion);
showMessage(ERROR, "Problemas al descargar el archivo");
}
}
Type GridFSDBFile
is an object that stores files in mongo, then InputStream
I call to get getInputStream()
, then pass it byte array
.
When I call this method, I get a big exception (part of it)
Caused by: java.lang.IllegalStateException
at com.liferay.portal.servlet.filters.gzip.GZipResponse.getWriter(GZipResponse.java:150)
at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:105)
at com.liferay.portal.kernel.servlet.MetaInfoCacheServletResponse.getWriter(MetaInfoCacheServletResponse.java:315)
at com.liferay.portlet.MimeResponseImpl.getWriter(MimeResponseImpl.java:102)
at com.liferay.faces.bridge.context.BridgeContextImpl.getResponseOutputWriter(BridgeContextImpl.java:1197)
at com.liferay.faces.bridge.context.BridgeContextWrapper.getResponseOutputWriter(BridgeContextWrapper.java:251)
at com.liferay.faces.bridge.context.ExternalContextCompat_2_0_Impl.getResponseOutputWriter(ExternalContextCompat_2_0_Impl.java:629)
at com.sun.faces.context.PartialViewContextImpl.createPartialResponseWriter(PartialViewContextImpl.java:429)
at com.sun.faces.context.PartialViewContextImpl.access$300(PartialViewContextImpl.java:72)
at com.sun.faces.context.PartialViewContextImpl$DelayedInitPartialResponseWriter.getWrapped(PartialViewContextImpl.java:573)
at com.liferay.faces.util.context.PartialResponseWriterWrapper.<init>(PartialResponseWriterWrapper.java:31)
at com.liferay.faces.util.context.PartialViewContextCleanupImpl$PartialResponseWriterCleanupImpl.<init>(PartialViewContextCleanupImpl.java:198)
at com.liferay.faces.util.context.PartialViewContextCleanupImpl.getPartialResponseWriter(PartialViewContextCleanupImpl.java:177)
at org.primefaces.context.PrimePartialViewContext.getPartialResponseWriter(PrimePartialViewContext.java:71)
at com.sun.faces.context.AjaxExceptionHandlerImpl.handlePartialResponseError(AjaxExceptionHandlerImpl.java:197)
at com.sun.faces.context.AjaxExceptionHandlerImpl.handle(AjaxExceptionHandlerImpl.java:124)
at javax.faces.context.ExceptionHandlerWrapper.handle(ExceptionHandlerWrapper.java:97)
at com.liferay.faces.bridge.context.ExceptionHandlerAjaxImpl.handle(ExceptionHandlerAjaxImpl.java:85)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at com.liferay.faces.bridge.BridgePhaseResourceImpl.execute(BridgePhaseResourceImpl.java:107)
... 136 more
How do I upload a file?
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1 answer
I found a solution, it is important to get Liferay ServletResponse and pass it to InputStream into byte array.
public StreamedContent getDownloadFileStreamContent(final GridFSDBFile noteAndFile)
{
try
{
PortletResponse portletResponse = (PortletResponse) FacesContext.getCurrentInstance().getExternalContext()
.getResponse();
HttpServletResponse res = PortalUtil.getHttpServletResponse(portletResponse);
res.setHeader("Content-Disposition", "attachment; filename=\"" + noteAndFile.getFilename() + "\"");//
res.setHeader("Content-Transfer-Encoding", "binary");
res.setContentType(noteAndFile.getContentType());
res.getOutputStream().write(IOUtils.toByteArray(noteAndFile.getInputStream()));
res.flushBuffer();
showMessage(SUCCESS, "Archivo descargado");
}
catch (IOException ioe)
{
showMessage(ERROR, "Problemas al descargar el archivo");
LOGGER.error("An error occurred uploading the file: " + ioe.getMessage(), ioe);
}
return null;
}
Adicionaly I use component
<p:commandButton value="Nuevo Download" ajax="false" update="growl">
<p:fileDownload value="#{cc.attrs.noteAndFileBean.getDownloadFileStreamContent(noteAndFile)}" />
</p:commandButton>
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