我正在尝试使用 Microsoft Graph SDK 获取 contentBytes 以下载办公邮件附件。我尝试了以下但它给出了 ClassCastException。我不知道如何通过 Microsoft Graph SDK(Java) 直接获取 FileAttachment 对象列表IAttachmentCollectionPage aAttachementPage = clientAuthGraphServiceClient.users("#userIDGiven#").mailFolders("Inbox").messages(message.id).attachments().buildRequest().get();for (Attachment aAttachment:aAttachementPage.getCurrentPage()) { String serviceDirectory="D:\\DOWNLOADS\\"; File fileDown= new File(serviceDirectory+aAttachment.name); Files.write(fileDown.toPath(), ((FileAttachment)aAttachment).contentBytes);}我正在使用以下罐子： <dependency> <groupId>com.microsoft.graph</groupId> <artifactId>microsoft-graph</artifactId> <version>1.4.0</version> </dependency>
4 回答
PIPIONE
TA贡献1829条经验 获得超9个赞
对于 GraphApi 版本 2.5.0
AttachmentCollectionPage attachmentCollectionPage =
graphClient
.me()
.messages(messageId)
.attachments()
.buildRequest()
.get(); JsonElement att = attachmentCollectionPage
.getCurrentPage()
.get(0)
.getRawObject()
.get("contentBytes");
byte[] decodedBytes = Base64.getDecoder().decode(att.getAsString());
慕标5832272
TA贡献1966条经验 获得超4个赞
每隔一段时间，我都会对着 Microsoft 文档大骂 Java 实现（大多数时候是不完整的），而且我花在升级客户端上的时间比我想花的时间还长。所以我在这里复制我自己的答案。可能有人觉得这很有用。
从 microsoft-graph 版本 5.34.0 开始，不再需要一些东西，比如解码，您将能够简单地转换您的对象。
获取 File/ItemAttachments 的复杂方法：
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);
}
交互式爱情
TA贡献1712条经验 获得超3个赞
我知道这是一个老问题，但我偶然发现了这个问题并认为我可以分享我们的解决方案。注意 NPE 或 IndexOutOfBoundsExceptions。
MessageCollectionPage messageCollectionPage = graphClient.me().messages().buildRequest().get();
List<String> messageIdsWithAttachments =
messageCollectionPage.getCurrentPage().stream()
.filter(message -> message.hasAttachments)
.map(message -> message.id)
.toList();
AttachmentCollectionPage attachmentCollectionPage =
graphClient
.me()
.messages(messageIdsWithAttachments.get(0))
.attachments()
.buildRequest()
.get();
byte[] bytes = ((FileAttachment) attachmentCollectionPage.getCurrentPage().get(0)).contentBytes;
烙印99
TA贡献1829条经验 获得超13个赞
有几种派生类型的附件。
文件附件
项目附件
参考附件
如果任何附件不是 FileAttachment，那么您将得到这种强制转换异常。在尝试将其转换为 FileAttachment 之前，您需要测试附件的类型。
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