在primefaces上传多张图片

Question

我正在使用带有多个上传选项的 PrimeFaces fileUpload。在我的项目中，我想在图像上传期间发送电子邮件通知。我的问题是当我上传 10 张图片时意味着同时发送 10 封电子邮件通知。我想在上传 10 张图片期间只发送一封电子邮件通知。我正在使用 primefaces 3.0 和 jsf 2.0。我该如何解决？

我的 jsf 页面：

     <p:fileUpload id="imaload" fileUploadListener="#{photoUploadAction.handleImage}"  
                           mode="advanced"  multiple="true" process="@form" 
                          update="messages,@form" 
                           allowTypes="/(\.|\/)(gif|jpe?g|png)$/"/>  

支持豆：

    public void handleImage(FileUploadEvent event) throws IOException, EmailException {
       try {
            photoUploadVO.setDisabled("false");

            //BufferedImage image = ImageIO.read(in);
            ImageIO.write(resize(bufferedImage, 400,  bufferedImage.getHeight()), "jpg", new File(tmpFile));
            flag = photoUploadDaoService.uploadPhotos(photoUploadVO);

            // profileImageService.uploadPhotos(profileImageBean);
            if (flag == true) {

                if(!loginBean.getType().equals("ngo") && !loginBean.getType().equals("admin") &&
                         !loginBean.getType().equals("ngo_coordinator") ){

                     volName = getVolunteerName(photoUploadVO.getUsrId(),photoUploadVO.getUser_type());

                 lst = apDao.retreiveSetup();
                   notification = lst.get(0).activity_email.toString();
                    email = lst.get(0).approval_toEmail.toString();

                    if(notification.equalsIgnoreCase(tmp)){
                          ecs.sendPhotoNotiFication(email,photoUploadVO,volName);
                    }
                 }

                FacesMessage msg = new FacesMessage("Successfully Uploaded");

                FacesContext.getCurrentInstance().addMessage(null, msg);
            } else {
                FacesMessage msg = new FacesMessage("Failure", event
                        .getFile().getFileName() + " to uploaded.");

                FacesContext.getCurrentInstance().addMessage(null, msg);
            }

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

            FacesMessage error = new FacesMessage(
                    FacesMessage.SEVERITY_ERROR,
                    "The files were not uploaded!", "");
            FacesContext.getCurrentInstance().addMessage(null, error);
        }
    }

    This is my email notification method inside handle upload methos:

     ecs.sendPhotoNotiFication(email,photoUploadVO,volName);

Answer 1

重新设计您的 bean，以便文件上传处理程序方法仅捕获并记住某个集合中的所有上传文件。然后在表单下方添加一个“保存”按钮，该按钮绑定到一个实际上将处理和保存所有上传的文件，最后发送邮件。如果您将 bean 放在视图范围内，那么只要最终用户与同一视图交互，就会重用相同的 bean 实例。然后，您可以只在集合属性中收集上传的文件。

像这样的东西：

@ManagedBean
@ViewScoped
public class Bean implements Serializable {

    private List<UploadedFile> uploadedFiles;

    @PostConstruct
    public void init() {
        uploadedFiles = new ArrayList<UploadedFile>();
    }

    public void upload(FileUploadEvent event) {
        uploadedFiles.add(event.getFile());
    }

    public void save() {
        for (UploadedFile uploadedFile : uploadedFiles) {
            // Process them all here.
        }

        // Send only one email.
    }

}

和

<p:fileUpload ... fileUploadListener="#{bean.upload}" />
<p:commandButton value="Save" action="#{bean.save}" />