将上传文件进度显示到dropbox

Question

我需要在窗口（JFrame）上显示当前正在上传到dropbox的文件的上传进度。

我查看了多个示例，其中大部分都使用了dropbox API v1。

我需要使用API​​ v2显示上传文件到Dropbox的进度。

我用于上传文件的编码如下所示:(如何操作此代码以显示文件上载进度。）

try
        {
            File file = new File("C:\\... Storage location of file on local system");
            //reads file as input for the method to dropbox
            InputStream fileupload = new FileInputStream(file);
            //path in dropbox account to store the file 
            // if want to store it in root just put '/'
            //if want to store file in a folder '/foldername/'
            client.files().uploadBuilder("/" + file.getName())
                    .withMode(WriteMode.OVERWRITE)//always overwrites the existing file in the dropbox folder
                    .uploadAndFinish(fileupload);
            JOptionPane.showMessageDialog(null, "File uploaded to dropbox");
        }
        //exception handled
        catch (DbxException e)
        {
            //error message for uploading file to dropboxcloud
            JOptionPane.showMessageDialog(null, "Unable to upload file to Cloud \n Error: " + e);
        }
        catch (IOException e)
        {
            JOptionPane.showMessageDialog(null, "Unable to upload file to cloud \n Error: " + e);
        }

当文件上传时，有人可以帮助我显示这个进度吗？

Answer 1

Dropbox API v2 Java SDK现在提供上传和下载的进度监听器。这已在v3.0.9中发布：

https://github.com/dropbox/dropbox-sdk-java/releases/tag/v3.0.9

这里有一个使用uploadAndFinish方法（https://dropbox.github.io/dropbox-sdk-java/api-docs/v3.0.x/com/dropbox/core/DbxUploader.html#uploadAndFinish-java.io.InputStream-long-com.dropbox.core.util.IOUtil.ProgressListener-）进行上传的例子：

https://github.com/dropbox/dropbox-sdk-java/blob/master/examples/upload-file/src/main/java/com/dropbox/core/examples/upload_file/Main.java#L50

它与文件下载的工作方式相同;下载方法（https://dropbox.github.io/dropbox-sdk-java/api-docs/v3.0.x/com/dropbox/core/DbxDownloader.html#download-java.io.OutputStream-com.dropbox.core.util.IOUtil.ProgressListener-）可选择以相同的方式获取ProgressListener参数。