对于公共链接，它工作正常，但在我的情况下，我需要从本地磁盘上传图像文件。我将图片转换为base64格式，并将html文件也写入本地磁盘，该html文件可以在浏览器中打开并显示图像，但google doc中的文档只是一个空文件，即使我将该html文件拖到google文档图像仍然不存在。我的代码如下：
DocsService client = new DocsService("testappv3");
client.setUserCredentials("username", "password");
File file = new File("c:/test.bmp");
ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
int read;
byte[] buff = new byte[1024];
while ((read = in.read(buff)) > 0)
{
out.write(buff, 0, read);
}
out.flush();
String base64 = Base64.encode(out.toByteArray());
String mimeType = DocumentListEntry.MediaType.fromFileName(file.getName()).getMimeType();
String html = "<html><body><img src=\"data:" + mimeType + ";base64," + base64 + "\"/></body></html>";
URL destFolderUrl = new URL("https://docs.google.com/feeds/default/private/full/<FOLDER_ID>/contents");
DocumentEntry newDocument = new DocumentEntry();
newDocument.setTitle(new PlainTextConstruct("test"));
newDocument.setMediaSource(new MediaByteArraySource(html.getBytes(), "text/html"));
newDocument = client.insert(destFolderUrl, newDocument);