每隔一段時間，我都會對著 Microsoft 文檔大罵 Java 實現（大多數時候是不完整的），而且我花在升級客戶端上的時間比我想花的時間還長。所以我在這里復制我自己的答案?？赡苡腥擞X得這很有用。
從 microsoft-graph 版本 5.34.0 開始，不再需要一些東西，比如解碼，您將能夠簡單地轉換您的對象。
獲取 File/ItemAttachments 的復雜方法：
List<Attachment> attachments = new ArrayList<>();
try {
AttachmentCollectionPage mgAttachmentList =
graphClient.users(emailAddress)
.messages(mail.id)
.attachments()
.buildRequest()
.get();
do {
attachments.addAll(mgAttachmentList.getCurrentPage());
// Check for next page
if (mgAttachmentList.getNextPage() != null) {
mgAttachmentList = mgAttachmentList.getNextPage().buildRequest().get();
} else {
mgAttachmentList = null;
}
} while (mgAttachmentList != null);
attachments.stream()
.filter(Objects::nonNull)
.forEach(attachment -> {
try {
// attachment equals a FileAttachment
if ("#microsoft.graph.fileAttachment".equalsIgnoreCase(attachment.oDataType)) {
byte[] attachmentContentBytes = ((FileAttachment) attachment).contentBytes;
if (attachmentContentBytes != null) {
// your own logic here
}
} else if ("#microsoft.graph.itemAttachment".equalsIgnoreCase(attachment.oDataType)) {
/*
* We need to convert each Attachment.
* If it's an ItemAttachment, we need to do another call to retrieve the item-object.
*
* The standard call with expand option gives us an Attachment (again)
*/
if (StringUtils.isNotBlank(attachment.contentType)) {
Attachment attachment = graphClient.users(emailAddress)
.messages(mail.id)
.attachments(attachment.id)
.buildRequest()
.expand("microsoft.graph.itemattachment/item")
.get();
if (attachment != null) {
// cast the object to whatever you need, in this example I retrieve the webLink
String linkToMessage = ((Message) ((ItemAttachment) attachment).item).webLink;
// your own logic here
}
} else {
log.info("Unknown attachment contentType for an ItemAttachment - Could not read attachment.");
}
} else {
log.error("Unable to read an attachment for mail.");
}
} catch (Exception e) {
log.error("Could not read attachment: '" + attachment.name + "' for message: '" + message.subject + ". " + e.getMessage(), e);
}
});
} catch (Exception e) {
log.error("Something went wrong while receiving attachments for message: '" + message.subject + "'. " + e.getMessage(), e);
}
