在primefaces中的文档查看器中显示上载的文档

我的工作要求，我需要上传一个文件使用primefaces中的fileupload组件，并显示相同的文件使用documentViewer组件在同一页上

<h:form  enctype="multipart/form-data">
        <p:fileUpload value="#{basicDocumentViewerController.file}"  mode="simple"></p:fileUpload>
                <p:separator/>
                <h:commandButton value="Upload file" action="#{basicDocumentViewerController.dummyAction}">
                </h:commandButton>
            <p:tabView>  
                <p:tab title="Display content of the file">  
                    <pe:documentViewer id="documentViewer"  height="500" value="#{basicDocumentViewerController.content}" />  
                </p:tab>  
            </p:tabView>  
        </h:form>

---

在上载操作成功完成之前，文档查看器组件应被禁用或不可见。上传操作完成后，应使用listener在文档查看器中显示内容。您能按照@Selaron的建议帮助实现这一点吗。我添加了传递给渲染属性的布尔属性。只有在上传文档成功的情况下，它才会成为现实

下面是代码片段供参考

HTML内容

 <h:body>
        <h:form  enctype="multipart/form-data">
        <p:fileUpload value="#{basicDocumentViewerController.file}"  mode="simple"></p:fileUpload>
                <p:separator/>
                <h:commandButton value="Dummy Action" action="#{basicDocumentViewerController.dummyAction}">
                </h:commandButton>
                    <pe:documentViewer id="documentViewer" rendered="#{basicDocumentViewerController.contentAvailable}" height="500" value="#{basicDocumentViewerController.content}" download="extensions-rocks.pdf"/>  
        </h:form>
    </h:body>

---

您不需要

p:tabView

来实现这一点。将

rendered=“#{not empty basicDocumentViewerController.content}”

添加到

pe:documentViewer

中。或者更好地向bean添加一个布尔属性，如果存在文档，则返回true，并在

呈现的
属性中询问该属性。我暗示您的解决方案是有效的，只要您没有在“在上载操作成功完成之前，文档查看器组件应被禁用或不可见”旁边说明特定问题
@ManagedBean(name = "basicDocumentViewerController")
@SessionScoped
public class BasicDocumentViewerController implements Serializable {

    private static final long serialVersionUID = 1L;

    private StreamedContent content;
    private UploadedFile file;
    private boolean contentAvailable =false;

    public UploadedFile getFile() {
        return file;
    }

    public void setFile(UploadedFile file) {
        this.file = file;
    }

    public StreamedContent getContent() throws IOException {
        if(content == null){
            content=pdfDocumentGenerate();
        }
        return content;
    }

    public String dummyAction(){
        System.out.println("Uploaded File Name Is :: "+file.getFileName()+" :: Uploaded File Size :: "+file.getSize());
        setContentAvailable(true);
        return "";
    }

    public void setContent(StreamedContent content) {
        this.content = content;
    }


    public DefaultStreamedContent pdfDocumentGenerate() throws IOException {

        try {
            byte[] document = IOUtils.toByteArray(file.getInputstream());
            return new DefaultStreamedContent(new ByteArrayInputStream(document), "application/pdf", "Actor_List");

        }finally{

        }
    }

    public boolean isContentAvailable() {
        return contentAvailable;
    }

    public void setContentAvailable(boolean contentAvailable) {
        this.contentAvailable = contentAvailable;
    }

}