使用Exchange Web服务Java API下载附件？

   <groupId>com.microsoft.ews-java-api</groupId>
   <artifactId>ews-java-api</artifactId>
   <version>2.0</version>
</dependency>

import microsoft.exchange.webservices.data.ExchangeService;
import microsoft.exchange.webservices.data.WebCredentials;

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
service.setUrl(new URI("https://outlook.office365.com/EWS/Exchange.asmx"));
service.setCredentials(new WebCredentials("username", "password"));

import microsoft.exchange.webservices.data.EmailMessage;
import microsoft.exchange.webservices.data.Folder;
import microsoft.exchange.webservices.data.Item;
import microsoft.exchange.webservices.data.PropertySet;
import microsoft.exchange.webservices.data.attachment.FileAttachment;

public static void downloadAttachments(ExchangeService service, Folder folder) throws Exception {
    for (Item item : folder.search()) {
        if (item instanceof EmailMessage) {
            EmailMessage email = (EmailMessage) item;
            email.load(new PropertySet(ItemSchema.Attachments));
            for (Attachment attachment : email.getAttachments()) {
                if (attachment instanceof FileAttachment) {
                    FileAttachment fileAttachment = (FileAttachment) attachment;
                    fileAttachment.load();
                    fileAttachment.loadContent();
                    String filePath = "C:\\Attachments\\" + fileAttachment.getName();
                    fileAttachment.save(filePath);
                }
            }
        }
    }
}

Folder inbox = Folder.bind(service, WellKnownFolderName.Inbox);
downloadAttachments(service, inbox);