从支持 bean 提供下载时，下载加速器会导致 org.apache.catalina.connector.ClientAbortException: java.io.IOException

Question

我使用 JSF 并希望在我的页面中下载文件。我写了一些代码，但是当我使用一些下载管理器下载我的文件时出现 ClientAbortException 错误：

public class FileUtil  {


public static FacesContext getContext() {
    return FacesContext.getCurrentInstance();
}

public static void sendFile(File file, boolean attachment) throws IOException {
    sendFile(getContext(), file, attachment);
}

public static void sendFile(FacesContext context, File file, boolean attachment) throws IOException {
    sendFile(context, new FileInputStream(file), file.getName(), file.length(), attachment);
}

public static void sendFile(FacesContext context, byte[] content, String filename, boolean attachment) throws IOException {
    sendFile(context, new ByteArrayInputStream(content), filename, (long) content.length, attachment);
}

public static void sendFile(FacesContext context, InputStream content, String filename, boolean attachment) throws IOException {
    sendFile(context, content, filename, -1L, attachment);
}

private static void sendFile(FacesContext context, InputStream input, String filename, long contentLength, boolean attachment) throws IOException {
    ExternalContext externalContext = context.getExternalContext();
    externalContext.setResponseBufferSize(10240);
    externalContext.setResponseContentType(getMimeType(context, filename));
    externalContext.setResponseHeader("Content-Disposition", String.format("%s;filename=\"%2$s\"; filename*=UTF-8\'\'%2$s", new Object[]{attachment ? "attachment" : "inline", encodeURL(filename)}));
    if (((HttpServletRequest) externalContext.getRequest()).isSecure()) {
        externalContext.setResponseHeader("Cache-Control", "public");
        externalContext.setResponseHeader("Pragma", "public");
    }

    if (contentLength != -1L) {
        externalContext.setResponseHeader("Content-Length", String.valueOf(contentLength));
    }

    long size = stream(input, externalContext.getResponseOutputStream());
    if (contentLength == -1L) {
        externalContext.setResponseHeader("Content-Length", String.valueOf(size));
    }

    context.responseComplete();
}


public static String getMimeType(FacesContext context, String name) {
    String mimeType = context.getExternalContext().getMimeType(name);
    if (mimeType == null) {
        mimeType = "application/octet-stream";
    }

    return mimeType;
}

public static long stream(InputStream input, OutputStream output) throws IOException {



    ReadableByteChannel inputChannel = Channels.newChannel(input);
    Throwable var3 = null;

    try {
        WritableByteChannel outputChannel = Channels.newChannel(output);
        Throwable var5 = null;

        try {
            ByteBuffer buffer = ByteBuffer.allocateDirect(10240);
            long size = 0L;

            while (inputChannel.read(buffer) != -1) {
                buffer.flip();
                size += (long) outputChannel.write(buffer);
                buffer.clear();
            }

            long var9 = size;
            return var9;
        } catch (Throwable var33) {
            var5 = var33;
            throw var33;
        } finally {
            if (outputChannel != null) {
                if (var5 != null) {
                    try {
                        outputChannel.close();
                    } catch (Throwable var32) {
                        var5.addSuppressed(var32);
                    }
                } else {
                    outputChannel.close();
                }
            }

        }
    } catch (Throwable var35) {
        var3 = var35;
        throw var35;
    } finally {
        if (inputChannel != null) {
            if (var3 != null) {
                try {
                    inputChannel.close();
                } catch (Throwable var31) {
                    var3.addSuppressed(var31);
                }
            } else {
                inputChannel.close();
            }
        }

    }

}

public static String encodeURL(String string) {
    if (string == null) {
        return null;
    } else {
        try {
            return URLEncoder.encode(string, StandardCharsets.UTF_8.name());
        } catch (UnsupportedEncodingException var2) {
            throw new UnsupportedOperationException("UTF-8 is apparently not supported on this platform.", var2);
        }
    }
}

}

我无法理解的是，当下载是通过本机 chorome 下载完成而不使用任何下载管理器（如 IDM 或 eagleget）时，我没有收到任何 ClientAbortException，但是当我使用这些下载管理器软件（启用它们AddOns）我收到这些错误

会发生什么？我知道这个错误发生在一些连接丢失的情况下......但我没有关闭我的页面或任何导致这个错误的东西！这是我的 bean 代码：

@ManagedBean(name = "bean")
@RequestScoped
public class MB implements Serializable {

public void MBdowan() throws IOException {


    File file = new File("E:\Animation\IA\Learning movies\webinar1\01_Aug_webinar_08\Aug08_edited_webinar_animation.mov");

    FileUtil.sendFile(file,true);

}

这是我的 xhtml 页面：

</h:head>
<h:body>
    <h:form>
        <p:commandButton value="Download file" ajax="false" actionListener="#{bean.MBdowan}"/>
    </h:form>
</h:body>

Answer 1

下载加速器（和媒体播放器！）需要通过 GET 和 HEAD 请求（即只需在浏览器的地址栏中键入 URL 时）幂等可用的文件，并且最好还支持 HTTP Range 请求（因此可以打开多个 HTTP 连接以同时下载部分内容）。 JSF 支持 bean 方法仅在 POST 请求时被调用（即当提交带有 method="post" 的 HTML 表单时）。 ClientAbortException 发生是因为下载加速器在嗅探 HEAD 和 Range 支持时没有得到预期的响应并中止了它。

如果这些文件是静态的，因此不是动态的，那么最好的办法是创建一个单独的 servlet，它支持 HEAD 请求，最好也支持 HTTP Range 请求。

鉴于您显然从 OmniFaces Faces#sendFile(), I'd suggest to rip off the source code of another OmniFaces artifact, the FileServlet. You can find snapshot showcase and source code link here: OmniFaces (2.2) FileServlet.

窃取了源代码

以下是您的使用方法：

@WebServlet("/webinar_animation.mov")
public class YourFileServlet extends FileServlet {

    @Override
    protected File getFile(HttpServletRequest request) throws IllegalArgumentException {
        return new File("E:\Animation\IA\Learning movies\webinar1\01_Aug_webinar_08\Aug08_edited_webinar_animation.mov");
    }

}

<a href="#{request.contextPath}/webinar_animation.mov">Download file</a>

另请参阅：

How to stream audio/video files such as MP3, MP4, AVI, etc using a Servlet

从支持 bean 提供下载时，下载加速器会导致 org.apache.catalina.connector.ClientAbortException: java.io.IOException

Download accelerator causes org.apache.catalina.connector.ClientAbortException: java.io.IOException when providing download from backing bean

jsf

file

download

primefaces

jsf-2

另请参阅：