GCS - Java to store data in Cloud Storage
0 likes757 views
This document provides steps to store data from a Java application in Google Cloud Storage. It describes how to 1) create a service account, download the private key file, and save the account details, and 2) develop a Java program to authenticate with the service account and make HTTP requests to Cloud Storage to list objects in a bucket. The Java code sets credentials using the service account private key, makes authenticated requests to Cloud Storage via the Google API client library, and prints the response.
![import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.Preconditions;
import com.google.common.io.Files;
public class StorageServiceAccountSample {
/** Service Account 的 Email */
private static final String SERVICE_ACCOUNT_EMAIL =
"86083545333...tkhf@developer.gserviceaccount.com";
/** 欲列表的Bucket名稱，名稱即可，不用gs:// */
private static final String BUCKET_NAME = "youtbucketname";
private static final String keypath = "pathtoyourprivatekey2.p12";
/** Google Cloud Storage OAuth 2.0 scope，這邊給予Read+Write權限 */
private static final String STORAGE_SCOPE =
"https://www.googleapis.com/auth/devstorage.read_write";
/** Global instance of the HTTP transport. */
private static HttpTransport httpTransport;
/** Global instance of the JSON factory. */
private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
public static void main(String[] args) {
try {
try {
httpTransport = GoogleNetHttpTransport.newTrustedTransport();
// 建制service account credential.
GoogleCredential credential = new GoogleCredential.Builder().setTransport(httpTransport)
.setJsonFactory(JSON_FACTORY)
.setServiceAccountId(SERVICE_ACCOUNT_EMAIL)
.setServiceAccountScopes(Collections.singleton(STORAGE_SCOPE))
.setServiceAccountPrivateKeyFromP12File(new File(keypath))
.build();
// Set up and execute Google Cloud Storage request.
String URI = "https://storage.googleapis.com/" + BUCKET_NAME;
HttpRequestFactory requestFactory = httpTransport.createRequestFactory(credential);
GenericUrl url = new GenericUrl(URI);
HttpRequest request = requestFactory.buildGetRequest(url);
HttpResponse response = request.execute();
String content = response.parseAsString();
// Instantiate transformer input
Source xmlInput = new StreamSource(new StringReader(content));
StreamResult xmlOutput = new StreamResult(new StringWriter());
// Configure transformer
Transformer transformer = TransformerFactory.newInstance().newTransformer(); // An
identity transformer
transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "testing.dtd");](https://image.slidesharecdn.com/gcs-javatostoredataincloudstorage-140528103936-phpapp01/85/GCS-Java-to-store-data-in-Cloud-Storage-4-320.jpg)
GCS - Java to store data in Cloud Storage
- 1. GCS - Java to store data in Cloud Storage 目錄 目錄 Step1: 申請Service Account，並將相關資訊儲存起來 Step2: Java程式開發 Step1: 申請Service Account，並將相關資訊儲存起來 選擇Service Account，點選Create Client ID之後，系統會直接下載一個xxxprivate.p12的檔案，該 檔案的密碼為”notasecret”，該密碼在需要做轉換pem檔案時候可以用到。