如何在java中使用Oauth Graph Service Client api检索office 365邮件文件(如图像、文本文件等)附件？

import com.microsoft.aad.msal4j.*;

public class AuthProvider {

    private static final String CLIENT_ID = "your_client_id";
    private static final String CLIENT_SECRET = "your_client_secret";
    private static final String AUTHORITY = "https://login.microsoftonline.com/your_tenant_id";

    private static ConfidentialClientApplication app;

    public static IAuthenticationResult getAccessToken() throws Exception {
        if (app == null) {
            app = ConfidentialClientApplication.builder(CLIENT_ID, ClientCredentialFactory.createFromSecret(CLIENT_SECRET))
                    .authority(AUTHORITY)
                    .build();
        }

        String[] scopes = {"https://graph.microsoft.com/.default"};

        ClientCredentialParameters parameters = ClientCredentialParameters.builder(scopes).build();

        return app.acquireToken(parameters).join();
    }
}

import com.microsoft.graph.authentication.IAuthenticationProvider;
import com.microsoft.graph.requests.GraphServiceClient;
import com.microsoft.graph.requests.MessageCollectionPage;
import com.microsoft.graph.models.Message;

public class GraphService {

    public static void main(String[] args) {
        IAuthenticationProvider authProvider = new IAuthenticationProvider() {
            @Override
            public void authenticateRequest(RequestInfo requestInfo) {
                try {
                    IAuthenticationResult result = AuthProvider.getAccessToken();
                    requestInfo.addHeader("Authorization", "Bearer " + result.accessToken());
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };

        GraphServiceClient<Request> graphClient = GraphServiceClient.builder().authenticationProvider(authProvider).buildClient();

        MessageCollectionPage messages = graphClient.me().messages().buildRequest().get();

        for (Message message : messages.getCurrentPage()) {
            // 处理邮件附件
            // 可以使用message.attachments().buildRequest().get()来获取附件列表
        }
    }
}