Primefaces File Download not working?
Guide for Primefaces version >= 10:
For Primefaces versions before 10 you had to disable ajax on the commandButton
with ajax=false
.
Since version 10 that's no longer needed, see Primefaces Documentation 10.
Guide for Primefaces version < 10:
See Primefaces Documentation 6.2
If you’d like to use PrimeFaces commandButton and commandLink, disable ajax option as fileDownload requires a full page refresh to present the file.
<h:form>
<p:commandButton id="downloadLink" value="Download" ajax="false" actionListener="#{filemanagement.prepDownload}">
<p:fileDownload value="#{filemanagement.download}" />
</p:commandButton>
</h:form>
From PrimeFaces 10 and up you can use Ajax downloads!
https://primefaces.github.io/primefaces/10_0_0/#/components/filedownload?id=ajax-downloading
The download will be triggered by JavaScript when you use Ajax on your command button or link.
See also:
https://github.com/primefaces/primefaces/issues/5978
Inside command button, set ajax=false and do not use action or action listener for commandlink.
<h:form>
<p:commandButton id="downloadLink" value="Download" ajax="false">
<p:fileDownload value="#{filemanagement.downloadValue}" />
</p:commandButton>
</h:form>
Bean:
public StreamedContent getDownloadValue() throws Exception {
StreamedContent download=new DefaultStreamedContent();
File file = new File("C:\\file.csv");
InputStream input = new FileInputStream(file);
ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
download = new DefaultStreamedContent(input, externalContext.getMimeType(file.getName()), file.getName()));
System.out.println("PREP = " + download.getName());
return download;
}