Question

我正在尝试在Alfresco资源管理器上添加一个特定的对话框，以便下载特定的docx文件。当我点击下载操作时代码工作正常，它下载文件但是如我的问题标题中所提到的，文件大小是0字节。

我用它来做到这一点：

public class NewFormDialog extends BaseDialogBean {

protected String aspect;

protected String finishImpl(FacesContext context, String outcome)
        throws Exception {

    download(aspect);

    // // get the space the action will apply to
    // NodeRef nodeRef = this.browseBean.getActionSpace().getNodeRef();
    //
    // // resolve the fully qualified aspect name
    // QName aspectToAdd = Repository.resolveToQName(this.aspect);
    //
    // // add the aspect to the space
    // getNodeService().addAspect(nodeRef, aspectToAdd, null);
    //
    // // return the default outcome
    return outcome;
}

public boolean getFinishButtonDisabled() {
    return false;
}

public String getFinishButtonLabel() {
    return "Download";
}

public void download(String pAspect) throws ServletException, IOException {

    String filename = pAspect;
    String filepath = "\\";
    BufferedInputStream buf = null;
    ServletOutputStream myOut = null;

    try {
        FacesContext fc = FacesContext.getCurrentInstance();
        HttpServletResponse response = (HttpServletResponse) fc
                .getExternalContext().getResponse();

        myOut = response.getOutputStream();
        File myfile = new File(filepath + filename);

        // set response headers
        response.setContentType("application/octet-stream");

        response.addHeader("Content-Disposition", "attachment; filename="
                + filename);

        response.setContentLength((int) myfile.length());

        FileInputStream input = new FileInputStream(myfile);
        buf = new BufferedInputStream(input);
        int readBytes = 0;

        // read from the file; write to the ServletOutputStream
        while ((readBytes = buf.read()) != -1)
            myOut.write(readBytes);
        myOut.flush();
        response.flushBuffer();

    } catch (IOException ioe) {

        throw new ServletException(ioe.getMessage());

    } finally {
        // close the input/output streams
        if (myOut != null)
            myOut.close();
        if (buf != null)
            buf.close();
        FacesContext.getCurrentInstance().responseComplete();
    }
}

public String getAspect() {
    return aspect;
}

public void setAspect(String aspect) {
    this.aspect = aspect;
}
}

我尝试了所有找不到的解决方案。

提前谢谢。

Answer 1

如果文件不存在，File.length()方法将返回0。检查以确保该文件存在。

提示： Apache Commons IO library简化了许多与I / O相关的任务。例如，以下代码片段将文件的内容流式传输到servlet响应：

HttpServletResponse response = ...
File myfile = ...
InputStream in = null;
OutputStream out = null;
try {
  in = new FileInputStream(myfile);
  out = response.getOutputStream();
  IOUtils.copy(in, out);
} finally {
  IOUtils.closeQuietly(in); //checks for null
  IOUtils.closeQuietly(out); //checks for null
}

下载的文件大小0

1 个答案: