Question

我已尝试过数以千计的替代品试图在网页浏览器中显示pdf，这是我的xhtml文件的一部分：

<p:media value="registerController.showFile" width="300" height="450" player="pdf" />

控制器：

@ManagedBean
@SessionScoped
public class RegisterController implements Serializable {

private static final long serialVersionUID = 1L;
StreamedContent showFile;

public StreamedContent getShowFile() {

    Path pdfPath = Paths.get("path\\to\\image");
    byte[] pdf = null;

    try {
        pdf = Files.readAllBytes(pdfPath);
    } catch (Exception e) {}

    ByteArrayInputStream b = new ByteArrayInputStream(pdf);
    DefaultStreamedContent d = new DefaultStreamedContent(b, "application/pdf");
    return d;
}

public void setPintaArchivo(StreamedContent showFile) {
    this.showFile = showFile;
    }
}

在控制台的浏览器中我收到404错误，这里有一些我没有成功的推荐：

Answer 1

如果您有完整路径（从资源文件夹）到已生成的PDF文件，您可以加载xhtml：

<object id="pdf_document" type="application/pdf" data="#{youBean.documentPath}?pfdrid_c=true" width="100%" height="500px">Your browser does not support this feature!</object>

好吧，如果你想从webservice返回的字节流中显示pdf内容，你可以使用primefaces-extensions的documentViewer组件（使用PDF.js）

因此，您需要在bean中加载字节流并生成StreamedContent：

@ManagedBean
@SessionScoped
public class StreamBean implements Serializable {

    private static final long serialVersionUID = 1L;

    private StreamedContent pdfContent;

    public void load() {
        try {
            // Simulate getting byte[] from external source, like webservice
            ClassLoader classloader = Thread.currentThread().getContextClassLoader();
            InputStream inputStream = classloader.getResourceAsStream("file-sample.pdf");

            int byteReaded = 0;
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            byte[] data = new byte[1024];

            while ((byteReaded = inputStream.read(data, 0, data.length)) != -1)
                buffer.write(data, 0, byteReaded);
            buffer.flush();
            byte[] pdfBytes = buffer.toByteArray();

            // Create the StreamedContent with readed pdf file
            pdfContent = new DefaultStreamedContent(new ByteArrayInputStream(pdfBytes), "application/pdf");

        } catch (IOException e) {
            // Manage your exception here
            e.printStackTrace();
        }
    }

    public StreamedContent getPdfContent() {
        return pdfContent;
    }
}

重要提示：不要将@PostConstruct放在load（）方法上，它会在preRender事件中调用：

<ui:composition template="/your-template.xhtml" ... xmlns:pe="http://primefaces.org/ui/extensions">

    <ui:define name="pageBody">

        <f:metadata>
            <f:event type="preRenderView" listener="#{streamBean.load()}" />
        </f:metadata>                   

        <pe:documentViewer height="450" value="#{streamBean.pdfContent}" download="file-sample.pdf" />  

    </ui:define>

</ui:composition>

注意：小心使用primefaces和primefaces-extensions版本，在这种情况下我使用过：

<dependency>
    <groupId>org.primefaces</groupId>
    <artifactId>primefaces</artifactId>
    <version>6.1</version>
</dependency>
<dependency>
    <groupId>org.primefaces.extensions</groupId>
    <artifactId>primefaces-extensions</artifactId>
    <version>6.1.0</version>
</dependency>

使用primefaces将StreamedContent渲染到媒体中是不可能的

1 个答案: