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PrimeFaces fileDownload does not work

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深忆病人
深忆病人 2021-01-02 18:03

I can\'t get the primeFaces work. While I succeed in downloading the file using a custom download bean. Seems like the issu is related to the

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  • 醉酒成梦
    2021-01-02 18:07 
    InputStream stream = this.getClass().getResourceAsStream("sessionlog.csv");

    The way as you have located the CSV file expects it to be in the same package as the current class, the FileDownloadBean.

    If it is actually located in the package root, then you should rather be using:

    InputStream stream = this.getClass().getResourceAsStream("/sessionlog.csv");

    Or if it is actually located in a different package, for example com.example, then you should rather be using:

    InputStream stream = this.getClass().getResourceAsStream("/com/example/sessionlog.csv");

    Or if it is actually located in the root of the public webcontent (there where the /WEB-INF folder also is, among all other web files), then you should rather be using:

    InputStream stream = externalContext.getResourceAsStream("/sessionlog.csv");

    (which by the way also works fine for the WAR classes instead of this.getClass())

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  • 一生所求
    2021-01-02 18:14

    My fileuplaad.xhtml is as shown below

      <html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">


    <h:form id="downloadFileForm">
            <p:commandButton id="downloadLink" value="Download"                                                                             ajax="false"
                                                onclick="PrimeFaces.monitorDownload(start, stop)"
                                                icon="ui-icon-arrowthichk-s">
                                                <p:fileDownload value="#{fileDownloadController.file}" />
                                            </p:commandButton>


        </h:form>
    </html>

Here is my bean:
@ManagedBean(name="fileDownloadController")
public class FileDownloadController implements Serializable {


    private static final long serialVersionUID = 1L;

    private StreamedContent file;  


    public FileDownloadController() {          
        InputStream stream = ((ServletContext)FacesContext.getCurrentInstance().getExternalContext().getContext()).getResourceAsStream("/download/FileName.csv");  
        file = new DefaultStreamedContent(stream, "download/csv", "FileName.csv");  
    }  

    public StreamedContent getFile() {  
        return file;  
    }    
}
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  • 逝去的感伤
    2021-01-02 18:28

    I am modify my InputStream the code

    InputStream stream = this.getClass().getResourceAsStream("sessionlog.csv");

    change by

    InputStream stream = new FileInputStream(new File("URL"))

    it was solution.

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  • 逝去的感伤
    2021-01-02 18:33

    Are you sure that you are successfully loading the CSV file as a resource from the Class? It looks like the InputStream may be null.

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