p：fileUpload从不为mode =“simple”调用监听器方法

Question

我正在使用p:fileUpload但是如果我使用mode="simple"则不会调用fileUploadListener。有没有办法在简单模式下使用fileUploadListener。

<p:fileUpload id ="uploading"
              fileUploadListener="#{workflowActionTemplate.handleFileUpload}"
              mode="simple" 
              update="messages"
              sizeLimit="100000" 
              allowTypes="/(\.|\/)(gif|jpe?g|png|pdf)$/"
              multiple="true"/>

主要面孔：3.2

我已完成以下配置，如果我遗漏任何内容，请告诉我。

veb.hml：

<!-- File Upload filter -->
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>

pom.hml：

<!-- Dependancy for file upload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2</version>
</dependency>

<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>3.2</version>
</dependency>

监听方法：

public void handleFileUpload(FileUploadEvent event) {
  FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded."); System.out.println("msg : "+ msg);
  uploadedFile = event.getFile();
}

--

如果我使用value属性而不是fileUploadListener，并且如果我没有上传文件，那么fileUpload属性没有设置，因此它给出了以下错误。

javax.faces.component.UpdateModelException: javax.el.ELException: /search/workflowAction.xhtml @181,104 value="#{workflowActionTemplate.uploadedFile}": Can't set property 'uploadedFile' of type 'org.primefaces.model.UploadedFile' on class 'com.principal.nq.statements.search.WorkflowActionTemplate$$EnhancerByCGLIB$$6ebcb7eb' to value ''

更新

由于fileUploadListener不工作，我还尝试以下列方式使用ajax调用来更新文件值。但f:ajax无法执行Primefaces p:fileUpload组件。我也试过p:ajax，但这也没有用。

<p:fileUpload id="uploading"
              value="#{workflowActionTemplate.uploadedFile}"
              mode="simple"
              update="messages"
              sizeLimit="100000" 
              allowTypes="/(\.|\/)(gif|jpe?g|png|pdf)$/"
              auto="true"/>
<p:growl id="messages" showDetail="true"/>
<h:commandButton id="uploadDocument" styleClass="continuebutton" value="#{msg.upload}" action="#{workflowActionTemplate.uploadParticipantCustomDoc}">
  <f:ajax execute="uploading" render="uploadDocumentDlg" onevent="onAjaxUploadCustomDoc"/>
</h:commandButton>

Answer 1

请按照以下步骤使您的代码完美无缺。在XHTML文件中。

    <p:fileUpload id="choose" validator="#{controllerClass.validateFile}" multiple="false" allowTypes="/(\.|\/)(gif|jpe?g|png)$/"  value="#{controllerclass.uploadedfile}" required="true" mode="simple"/>

<p:commandButton ajax="false" id="saveBtn" update="errBrand,pnl" value="Save Brand" action="#{controllerClass.uploadFile()}" />

在web.xml中定义以下过滤器和servlet。

  <filter>
    <filter-name>PrimeFaces FileUpload Filter</filter-name>
    <filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>PrimeFaces FileUpload Filter</filter-name>
    <servlet-name>Faces Servlet</servlet-name>
  </filter-mapping>

在控制器类中，您需要像这样定义方法体

使用import org.primefaces.model.UploadedFile;

private UploadedFile uploadedfile;

如果要为上传的文件定义验证方法，可以这样写

public void validateFile(FacesContext ctx,
            UIComponent comp,
            Object value) {
        List<FacesMessage> msgs = new ArrayList<FacesMessage>();
        UploadedFile file = (UploadedFile)value;
        int fileByte = file.getContents().length;
        if(fileByte > 15360){
            msgs.add(new FacesMessage("Too big must be at most 15KB"));
        }
        if (!(file.getContentType().startsWith("image"))) {
            msgs.add(new FacesMessage("not an Image file"));
        }
        if (!msgs.isEmpty()) {
            throw new ValidatorException(msgs);
        }
    }