JSFを使用してExcelファイルをダウンロードできない

Question

こんにちは私はExcelシートを生成し、ユーザーがダウンロードボタンをクリックするとダウンロードできるようにコードを書こうとしています....私はExcelシートしかし、私は同じをダウンロードしようとしたが、私は失敗しました。

私が使用している方法は次のとおりです。

は

public void download() throws IOException { 
    File file = new File("D:\\pdf\\carrierReport7.xls"); 

    FacesContext facesContext = FacesContext.getCurrentInstance(); 

    HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse(); 

    response.setHeader("Content-Disposition", "attachment;filename=" + file.getName()); 
    response.setHeader("Content-Type", "application/vnd.ms-excel"); 

    OutputStream outputStream = response.getOutputStream(); 

    FileInputStream fileInputStream = new FileInputStream(file); 

    byte[] bytesBuffer = new byte[2048]; 

    int bytesRead = 0; 

    while ((bytesRead = fileInputStream.read(bytesBuffer)) > 0) { 
     outputStream.write(bytesBuffer, 0, bytesRead); 
    } 

    outputStream.flush(); 

    fileInputStream.close(); 
    outputStream.close(); 

    facesContext.responseComplete(); 
} 

JSFコマンド：

Answer 1

私はJSF 2に似た何かをやっているどのようにこれは、どのバージョンあなたは上のわかりません。

public void downloadAttachment(Attachment attachment) throws IOException { 
    FacesContext fc = FacesContext.getCurrentInstance(); 
    ExternalContext ec = fc.getExternalContext(); 

    ec.responseReset(); // Some JSF component library or some Filter might have set some headers in the buffer beforehand. We want to get rid of them, else it may collide. 
    ec.setResponseContentType(ec.getMimeType(attachment.getFilename()));   
    ec.setResponseContentLength(attachment.getFilesizeBytes().intValue()); // Set it with the file size. This header is optional. It will work if it's omitted, but the download progress will be unknown. 
    ec.setResponseHeader("Content-Disposition", "attachment; filename=\"" + attachment.getFilename() + "\""); // The Save As popup magic is done here. You can give it any file name you want, this only won't work in MSIE, it will use current request URL as file name instead. 

    OutputStream output = ec.getResponseOutputStream(); 
    output.write(attachment.getFileData()); 

    fc.responseComplete(); // Important! Otherwise JSF will attempt to render the response which obviously will fail since it's already written with a file and closed. } 

}