Aws Java Sdk Upload File to S3

April 15, 2022 Post a Comment

Details: Written past; Last Updated on 03 January 2022 | Impress Email

In this AWS Java SDK tutorial, I'd like to share with you some lawmaking examples for uploading files programmatically from local computer to a bucket on Amazon S3 server, with a Java console plan, using AWS SDK for Java. In details, you volition larn:

Upload a file to S3 saucepan with default permission
Upload a file to S3 bucket with public read permission
Wait until the file exists (uploaded)

To follow this tutorial, you must take AWS SDK for Java installed for your Maven project.

Annotation : In the following code examples, the files are transferred direct from local computer to S3 server over HTTP.

1. Upload File to S3 Bucket with Default Permission

The post-obit lawmaking example uploads an image file to a S3 bucket in your AWS business relationship's default region, with default permission (possessor has read-write permission; public users do not have permission):

package net.codejava.aws;  import java.io.File;  import software.amazon.awssdk.cadre.sync.RequestBody; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.PutObjectRequest;  public grade UploadFileExample1 { 	public static void main(String[] args) { 		Cord bucketName = "codejava-bucket"; 		 		String fileName = "Java Logo.png"; 		String filePath = "D:/Images/" + fileName; 		 		S3Client customer = S3Client.builder().build(); 		 		PutObjectRequest asking = PutObjectRequest.architect() 							.bucket(bucketName).fundamental(fileName).build(); 		 		client.putObject(asking, RequestBody.fromFile(new File(filePath))); 				 	} }

The code is self-explanatory - quite simple, correct? The file is stored as an object in the given bucket, with object primal is the file name. If y'all want to put the file in a "binder", specify the key something like this:

.bucket(bucketName).key("programming/coffee/" + fileName).build();

Besides note that by default, the uploaded file is not accessible by public users. And the plan terminates quickly every bit the operation is asynchronous.

2. Upload File to S3 Bucket with Public Read Permission

In example you want to give read permission for public users, i.e. the file is accessible by visitors using web browser, you can specify the public-read permission when creating a new request similar this:

PutObjectRequest request = PutObjectRequest.builder() 			.bucket(bucketName) 			.fundamental(fileName) 			.acl("public-read").build();

So you lot tin can use spider web browser to admission the file using the following URL pattern:

https://bucket-name.s3.region-proper noun.amazonaws.com/object-key

Replace saucepan-name, region-name and object-key by their actual values.

iii. Set up additional information for upload file

You tin use the contentXXX() methods of the PutObjectRequest class to specify boosted data for the file stored on S3. For example, the following code set content blazon of the file to be "image/png" for the file:

PutObjectRequest request = PutObjectRequest.architect() 		.bucket(bucketName) 		.primal(key) 		.acl("public-read") 		.contentType("prototype/png") 		.build();

The other methods are contentDisposition(), contentEncoding(), contentLanguage(), contentLength()…

iv. Expect Until the File Exists (Uploaded)

By default, the file upload operation is asynchronous. If yous want to wait until the file exists (uploaded) in club to run some custom logics that depend on the existence of the file, apply a S3Waiteras shown in the following code example:

parcel internet.codejava.aws;  import coffee.io.File;  import software.amazon.awssdk.core.sync.RequestBody; import software.amazon.awssdk.cadre.waiters.WaiterResponse; import software.amazon.awssdk.services.s3.S3Client; import software.amazon.awssdk.services.s3.model.HeadObjectRequest; import software.amazon.awssdk.services.s3.model.HeadObjectResponse; import software.amazon.awssdk.services.s3.model.PutObjectRequest; import software.amazon.awssdk.services.s3.waiters.S3Waiter;  public class UploadFileExample3 { 	public static void main(Cord[] args) { 		String bucketName = "codejava-bucket"; 		Cord folderName = "photos"; 		 		String fileName = "Java Logo.png"; 		Cord filePath = "D:/Images/" + fileName; 		String cardinal = folderName + "/" + fileName; 		 		S3Client customer = S3Client.architect().build(); 		 		PutObjectRequest request = PutObjectRequest.builder() 						.bucket(bucketName) 						.primal(key) 						.acl("public-read") 						.build(); 		 		client.putObject(request, RequestBody.fromFile(new File(filePath))); 		 		S3Waiter waiter = client.waiter(); 		HeadObjectRequest requestWait = HeadObjectRequest.builder().bucket(bucketName).cardinal(cardinal).build(); 		 		WaiterResponse<HeadObjectResponse> waiterResponse = waiter.waitUntilObjectExists(requestWait); 		 		waiterResponse.matched().response().ifPresent(Arrangement.out::println); 		 		Organization.out.println("File " + fileName + " was uploaded.");		 	} }

Yous see, the method call waitUntilObjectExists() cause the program to wait until the file actually uploaded to S3. And so yous tin can run your logic afterward.

Those are some code examples about uploading files directly from local computer to a bucket on Amazon S3 server, using AWS SDK for Coffee. To run into the coding in activeness, I recommend you lot watch the following video:

Almost the Writer:

Nam Ha Minh is certified Java developer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in dearest with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.

rodriguezthadly.blogspot.com

Source: https://www.codejava.net/aws/upload-file-to-s3-java-console

Rodriguez Thadly