Primefaces FacesMessage不能从FileUploadEvent显示

Question

有没有人能够在FileUploadEvent中添加FacesMessage时出现？我不能这样做......

<p:dialog header="#{bundle['dreamUpload.HEADER']}" 
    widgetVar="dreamUploadDlg" modal="true" styleClass="dialog dialog2" 
    draggable="false" resizable="false" showEffect="fade" 
    hideEffect="fade"> 
    <div class="dialog-top-reg"></div> 
    <div class="dialog-middle-reg"> 
     <div class="close-button"> 
      <h:form> 
       <p:commandButton onclick="dreamUploadDlg.hide()" /> 
      </h:form> 
     </div> 
     <h:form class="dialog-content dialog-content2"> 
      <h1 class="upload-dream"> 
       <h:outputText value="#{bundle['dreamUpload.HEADER']}" /> 
      </h1> 
      <p class="upload-dream"> 
       <h:outputText value="#{bundle['dreamUpload.SUBHEADER']}" /> 
      </p> 
      <div class="upload-dream-wrap"> 
       <fieldset> 
        <p:inputText /> 
        <p:growl id="messages" showSummary="true" showDetail="true" /> 
        <p:fileUpload fileUploadListener="#{dreamFileUpload.handleFileUpload}" auto="true" 
          allowTypes="*.jpg;*.png;*.gif;" description="Images"/> 
       </fieldset> 
       <h:outputText class="requirements" 
        value="#{bundle['dreamUpload.upload.requirements.TEXT']}" /> 
      </div> 
     </h:form> 
    </div> 
    <div class="dialog-bottom-reg"></div> 
</p:dialog> 

@Named 
@Scope("request") 
public class DreamFileUpload extends BaseAction{ 
@Inject 
DreamFileUploadBean dreamFileUploadBean; 

public void handleFileUpload(FileUploadEvent event) { 
    String path="https://stackoverflow.com/users/cgray/fileupload"; 
    //new File(path + "/" + album.getId()).mkdirs(); 
    File result = new File(path + "/" + event.getFile().getFileName()); 

    try { 
     FileOutputStream fileOutputStream = new FileOutputStream(result); 

     byte[] buffer = new byte[512000]; //50kb 

     int bulk; 
     InputStream inputStream = event.getFile().getInputstream(); 
     while (true) { 
      bulk = inputStream.read(buffer); 
      if (bulk < 0) { 
       break; 
      } 
      fileOutputStream.write(buffer, 0, bulk); 
      fileOutputStream.flush(); 
     } 

     fileOutputStream.close(); 
     inputStream.close(); 

     FacesMessage msg = new FacesMessage("Succesful", 
       event.getFile().getFileName() + " is uploaded."); 
     FacesContext.getCurrentInstance().addMessage(null, msg); 


    } catch (IOException e) { 
     e.printStackTrace(); 
     FacesMessage error = new FacesMessage("The files were not uploaded!"); 
     FacesContext.getCurrentInstance().addMessage(null, error); 
    } 
} 

public void close(CloseEvent e){ 

} 
} 

Answer 1

这是所有的Ajax，所以你需要更新属性添加到文件上传标签像
<p:fileUpload fileUploadListener="#{dreamFileUpload.handleFileUpload}" auto="true" allowTypes="*.jpg;*.png;*.gif;" description="Images" update="messages"/>