Null in PrimeFaces component UploadFile

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Null in PrimeFaces component UploadFile

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#1 by (1 votes)

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I'm having trouble retrieving this file, file , in my bean.

.xhtml

<h:form id="form" enctype="multipart/form-data">
 <p:fileUpload value="#{bean.file}" 
                    skinSimple="true" mode="simple" />
 <p:commandButton value="Enviar" ajax="true"
                    action="#{bean.addFile}" /></h:form>

Bean.java

@ManagedBean
@ViewScoped
public class Bean{

    private UploadedFile file;


    public UploadedFile getFile() {
        return file;
    }

    public void setfile(UploadedFile file) {
        this.file = file;
    }

    public void addFile() {
        try {
            String fileName = file.getFileName();
            File fileOut = new File(fileName);

            FileOutputStream fileOutputStream = new FileOutputStream(fileOut);
            fileOutputStream.write(file.getContents());
            fileOutputStream.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

When trying to access the file attribute, in the addFile() method, called by commandButton , the file attribute is not set to the file I uploaded, it is set to null. I can not find the problem, I have researched in several sources and I did not succeed.

The imports:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;

import org.primefaces.model.UploadedFile;

java jsf primefaces

asked by anonymous 28.06.2017 / 21:54

1 answer

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score 1 · Answer 1

I see two points that need attention:

Using ajax="true" in the commandButton component when used in set with the component FileUpload , where it is configured to use simple mode (% w / w). This is due to the fact that the component in the simple version does not support mode="simple" requests. If you really need this support, you can use advanced mode ( ajax ).

Using mode="advanced" in the action component is wrong, because commandButton should be used when there is intention to navigate between pages, instead use action , which is used in cases where you need to execute logic related to the view, where there is no need to change pages.

Here's an example of how it would look:

<h:form enctype="multipart/form-data">
    <p:fileUpload value="#{bean.file}" mode="simple" skinSimple="true"/>
    <p:commandButton value="Enviar" ajax="false" actionListener="#{bean.addFile}"/>
</h:form>