我正在尝试从直接 Web URL 下载附件并使用 Java 将其保存在我的本地计算机中但下载的文件只有 2 KB

如何解决我正在尝试从直接 Web URL 下载附件并使用 Java 将其保存在我的本地计算机中但下载的文件只有 2 KB

我正在尝试使用 Java 从直接 https Web URL 下载附件。 例如，https://DNS/secure/attachment/1165147/RegressionTestingPlugin.zip 我可以下载附件，但只有 2 KB。我尝试了很多方法，但都无济于事。 你能帮我解决这个问题吗？

方法一

URL url3 = new URL(AttachmentURL);
HttpsURLConnection httpconnection1= (HttpsURLConnection) url3.openConnection();                             
httpconnection1 = (HttpsURLConnection) url3.openConnection();
httpconnection1.setRequestProperty("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange");
httpconnection1.setRequestProperty("Authorization","Basic DummyAUTH");
httpconnection1.setRequestProperty("Content-Type","application/octet-stream");
OutputStream os = new FileOutputStream("C:/IssueIDs/"+AttachmentName,true);
os.close();

方法二

URL url4 = new URL(AttachmentURL);
URLConnection connection = url4.openConnection();
InputStream inputstream = connection.getInputStream();
FileSystemView filesys = FileSystemView.getFileSystemView();
filesys.getHomeDirectory();
bufferedoutputstream bufferedoutputstream = new bufferedoutputstream(new FileOutputStream(new File("C:\\IssueIDs\\"+AttachmentName)));
byte[] buffer = new byte[1024];
int bytesRead;
while((bytesRead = inputstream.read(buffer)) > 0)
{ 
    bufferedoutputstream.write(buffer,bytesRead);
}
bufferedoutputstream.flush();
bufferedoutputstream.close();
inputstream.close();