在不设置GOOGLE_APPLICATION_CREDENTIALS的情况下从Java验证Google DLP API？

import com.google.auth.oauth2.GoogleCredentials;
import com.google.cloud.dlp.v2.DlpServiceClient;
import com.google.cloud.dlp.v2.DlpServiceSettings;

public class DlpApiExample {
    public static void main(String[] args) {
        try {
            // 加载服务帐号密钥文件
            GoogleCredentials credentials = GoogleCredentials.fromStream(
                    new FileInputStream("path/to/credentials.json"));

            // 创建DLP服务客户端
            DlpServiceSettings settings = DlpServiceSettings.newBuilder().setCredentialsProvider(
                    FixedCredentialsProvider.create(credentials)).build();
            try (DlpServiceClient dlpServiceClient = DlpServiceClient.create(settings)) {
                // 在此处执行DLP API操作
                // ...
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}