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Cloud Platforms > Google Cloud Platform (GCP) > Cloud Storage

Cloud Storage

Author: Venkata Sudhakar

Google Cloud Storage is a unified object storage service for developers and enterprises. It offers worldwide storage and retrieval of any amount of data at any time, from simple website hosting to mobile apps to data analytics.

Storage Classes:

1. Standard - Best for frequently accessed data and short-term storage.

2. Nearline - Low cost for data accessed less than once a month.

3. Coldline - Very low cost for data accessed less than once a quarter.

4. Archive - Lowest cost for data accessed less than once a year.

The below example shows how to upload, download, and list objects in a Cloud Storage bucket using the Java client library.

import com.google.cloud.storage.Blob;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.BlobInfo;
import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.BucketInfo;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

public class CloudStorageExample {

public static void main(String[] args) throws Exception {
        Storage storage = StorageOptions.getDefaultInstance().getService();
        String bucketName = "my-gcp-bucket-" + System.currentTimeMillis();
        String objectName = "hello.txt";

// Create a bucket
        Bucket bucket = storage.create(BucketInfo.of(bucketName));
        System.out.println("Bucket created: " + bucket.getName());

// Upload an object
        BlobId blobId = BlobId.of(bucketName, objectName);
        BlobInfo blobInfo = BlobInfo.newBuilder(blobId)
            .setContentType("text/plain")
            .build();
        String content = "Hello from Google Cloud Storage!";
        Blob blob = storage.create(blobInfo, 
            content.getBytes(StandardCharsets.UTF_8));
        System.out.println("Object uploaded: " + blob.getName());

// Download the object
        byte[] downloaded = storage.readAllBytes(bucketName, objectName);
        System.out.println("Downloaded content: " + 
            new String(downloaded, StandardCharsets.UTF_8));

// List objects in bucket
        System.out.println("Objects in bucket:");
        storage.list(bucketName).iterateAll()
            .forEach(b -> System.out.println("  - " + b.getName()));
    }
}

It gives the following output,

Bucket created: my-gcp-bucket-1704067200000
Object uploaded: hello.txt
Downloaded content: Hello from Google Cloud Storage!
Objects in bucket:
  - hello.txt

Key gsutil Commands:

gsutil mb gs://bucket-name - Create a new bucket.

gsutil cp file.txt gs://bucket-name/ - Upload a file.

gsutil cp gs://bucket-name/file.txt . - Download a file.

gsutil ls gs://bucket-name/ - List objects in a bucket.

gsutil rm gs://bucket-name/file.txt - Delete an object.

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