p：fileUpload多文件问题

Question

我在XHTML中创建一个页面，使用primeface <p:fileUpload>组件上传多个文件。

问题是：

如果我选择20个文件。复制的文件有时可能是12个，有时是17个。我无法理解我需要修复哪种错误。我在下面粘贴了Java和xhtml代码。

XHTML：

  <h:head>
        <title>Sample Page</title>
    </h:head>
    <h:body>
        <f:event listener="#{MessagePanel.initializePageAttributes}" type="preRenderComponent"/>
        <h:form enctype="multipart/form-data">

            <p:panel id="multiUploadId" rendered="#{!MessagePanel.renderedPanel}">
                <h:panelGrid columns="3">
                    <h:outputText value="Upload:"/>

                    <p:fileUpload value="#{MessagePanel.file}" mode="advanced" multiple="true"
                                  fileUploadListener="#{MessagePanel.fileUploadListener}" update="multiUploadId">
                    </p:fileUpload>

                </h:panelGrid>
            </p:panel>
        </h:form>
    </h:body>
</html>

Java代码：

public void fileUploadListener(FileUploadEvent e)
    {
        try
        {
            // Get uploaded file from the FileUploadEvent
            // Print out the information of the file
            this.file = e.getFile();
            System.out.println("Uploaded File Name Is :: " + file.getFileName() + " :: Uploaded File Size :: " + file.getSize());
            File destFile = new File("/home/nafeel/Desktop/upload/" + file.getFileName());

            FileUtils.copyInputStreamToFile(file.getInputstream(), destFile);
            e.getComponent().setTransient(false);
        }
        catch (IOException ex)
        {
            System.out.println("IO exception: "+ex.getMessage());
        }
    }