How to upload file of p:fileUpload using command b

问题:

Iam using JSF2.1 along with primefaces for uploading file.In my application i have to add the file dynamically on creating a record.But when i use i cant write the code for uploading my file during save.I want the file to be uploaded on click of save only and not during upload. Can anyone help me how to implement this

public String handleFileUpload(FileUploadEvent event) throws IOException {  
    FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
    FacesContext.getCurrentInstance().addMessage(null, msg);  
    UploadedFile file = event.getFile();

    String prefix = FilenameUtils.getBaseName(file.getFileName());
    String suffix = FilenameUtils.getExtension(file.getFileName());


    String path = "C:/apache-tomcat-7.0.47/webapps/ROOT/WEB-INF/images";

     ExternalContext extContext = FacesContext.getCurrentInstance().getExternalContext();


    File fileToDirectory = File.createTempFile(prefix + "-", "." + suffix, new File(path));

    InputStream inputStream = event.getFile().getInputstream();
    String fileName = event.getFile().getFileName();

    OutputStream outputStream = new FileOutputStream(fileToDirectory);

    byte[] buffer = new byte[1024];

    int length;
    //copy the file content in bytes 
    while ((length = inputStream.read(buffer)) > 0){

        outputStream.write(buffer, 0, length);

    }

    inputStream.close();
    outputStream.close();
    return path+fileName;


}

I need to have this code on save but i cant get event during save

回答1:

That isn't possible with advanced mode. Use the simple mode instead. Then you can bind the input value to an UploadedFile property directly.

E.g.

<h:form enctype="multipart/form-data">
    ...
    <p:fileUpload mode="simple" value="#{bean.file}" />
    ...
    <p:commandButton value="Save" action="#{bean.save}" ajax="false" />
</h:form>

with

private UploadedFile file; // +getter+setter

public void save() {
    // ...
}