确保在文件上传侦听器完成后调用Bean操作方法

当用户上载带有Primefaces fileUpload元素的文件时，仅在文件上传后调用服务器方法。然后，当提交表单并且文件未完全传输到服务器时，我遇到了问题。我不知道在提交方法中需要等多久。确保在文件上传侦听器完成后调用Bean操作方法

要在提交方法期间等待，我创建了一个线程，只要上传需要，就会在用户选择文件时不会触发方法“handleFileUpload（FileUploadEvent event）”时指向该线程。

public void handleFileUpload(FileUploadEvent event) { 
     System.out.println("start fileupload"); 
     FileUploadWaiter fileUploadWaiter = new FileUploadWaiter(); 
     fileUploadThread = new Thread(fileUploadWaiter); 
     fileUploadThread.start(); 
     System.out.println("fileupload triggered"); 
     fileType = event.getFile().getContentType(); 
     file = convertUploadedFileToByte(event.getFile()); 
     fileUploadWaiter.stop(); 
     try { 
      fileUploadThread.join(); 
     } catch (InterruptedException e) { 
      // 
     } 
     System.out.println("upload fertig");// TODO 
    }

在页面：

<h:form enctype="multipart/form-data" id="form"> 
... 
<p:fileUpload fileUploadListener="#{eintrag.handleFileUpload}" 
            mode="advanced" update="msgFileUpload" auto="true" 
            sizeLimit="#{config.fileUploadMaxSize}" 
            allowTypes="/(\.|\/)(jpeg|jpg|png)$/" label="Auswählen" 
            disable="false" id="fileUpload" /> 
... 
</h:form>

验证码：

public void handleFileUpload(FileUploadEvent event) { 
     System.out.println("start fileupload"); 
     FileUploadWaiter fileUploadWaiter = new FileUploadWaiter(); 
     fileUploadThread = new Thread(fileUploadWaiter); 
     fileUploadThread.start(); 
     System.out.println("fileupload triggered"); 
     fileType = event.getFile().getContentType(); 
     file = convertUploadedFileToByte(event.getFile()); 
     fileUploadWaiter.stop(); 
     try { 
      fileUploadThread.join(); 
     } catch (InterruptedException e) { 
      // 
     } 
     System.out.println("fileupload finished");// TODO 
    }

我发现，在Primefaces没有提示手册

来源

2015-05-10 gregor

为什么不阻止，而该文件的上传完成页/禁用成分的休息吗？ – kolossus

无论您尝试什么，永远不会*，永远*，**永远不会**在Java EE应用程序中手动创建一个'Thread'。 – BalusC

感谢kolossus，我在阻止提交按钮文件上传

page.xhtml：

<script> 
    function disableButtons() { 
     $(PrimeFaces.escapeClientId('form:fileUpload_input')).prop('disabled', true); 
     $(PrimeFaces.escapeClientId('form:erstellen')).prop('disabled', true); 
    } 

    function enableButtons() { 
     if (!PF('upload').files.length) { 
       $(PrimeFaces.escapeClientId('form:fileUpload_input')).prop('disabled', false); 
       $(PrimeFaces.escapeClientId('form:erstellen')).prop('disabled', false); 
       } 
    } 
</script> 


<p:fileUpload fileUploadListener="#{eintrag.handleFileUpload}" 
    mode="advanced" update="msgFileUpload" auto="true" 
    sizeLimit="#{config.fileUploadMaxSize}" 
    allowTypes="/(\.|\/)(jpeg|jpg|png)$/" label="Auswählen" 
    id="fileUpload" dragDropSupport="false" 
    invalidSizeMessage="Dateigröße überschritten #{config.fileUploadMaxSize}" 
    onstart="disableButtons();" 
    oncomplete="enableButtons();" 
    widgetVar="upload" />

来源

2015-05-13 18:19:46 gregor

确保在文件上传侦听器完成后调用Bean操作方法

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