您可以参考登录用户请求的示例，请参见此处。

IGraphServiceClient graphClient = GraphServiceClient.builder().authenticationProvider( authProvider ).buildClient();

// for "/me" endpoint    
User user = graphClient.me().buildRequest().get(); 

// for "/users/{id | userPrincipalName}" endpoint
// User user = graphClient.users("{id}").buildRequest().get()

使用accesstoken获取authprovider，请参阅本文：

public IGraphServiceClient getAuthProvider() {
    IAuthenticationProvider mAuthenticationProvider;

    try {
        String accessToken = "xxxxxxxxxxxxx";
        mAuthenticationProvider = request -> request.addHeader("Authorization", "Bearer " + accessToken);
    } catch (Exception e) {
        throw new Error("Could not create a graph client: " + e.getLocalizedMessage());
    }

    return GraphServiceClient.builder()
                             .authenticationProvider(mAuthenticationProvider)
                             .buildClient();
}

有关详细信息，请使用microsoft graph SDK with java进行api调用。