Java tutorial
/* * Copyright 2010-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"). * You may not use this file except in compliance with the License. * A copy of the License is located at * * http://aws.amazon.com/apache2.0 * * or in the "license" file accompanying this file. This file is distributed * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language governing * permissions and limitations under the License. */ import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Writer; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.UUID; import com.amazonaws.AmazonClientException; import com.amazonaws.AmazonServiceException; import com.amazonaws.auth.ClasspathPropertiesFileCredentialsProvider; import com.amazonaws.regions.Region; import com.amazonaws.regions.Regions; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3Client; import com.amazonaws.services.s3.model.Bucket; import com.amazonaws.services.s3.model.CannedAccessControlList; import com.amazonaws.services.s3.model.GetObjectRequest; import com.amazonaws.services.s3.model.ListObjectsRequest; import com.amazonaws.services.s3.model.ObjectListing; import com.amazonaws.services.s3.model.PutObjectRequest; import com.amazonaws.services.s3.model.S3Object; import com.amazonaws.services.s3.model.S3ObjectSummary; /** * This sample demonstrates how to make basic requests to Amazon S3 using * the AWS SDK for Java. * <p> * <b>Prerequisites:</b> You must have a valid Amazon Web Services developer * account, and be signed up to use Amazon S3. For more information on * Amazon S3, see http://aws.amazon.com/s3. * <p> * <b>Important:</b> Be sure to fill in your AWS access credentials in the * AwsCredentials.properties file before you try to run this * sample. * http://aws.amazon.com/security-credentials */ public class AmazonS3Handler { public static final String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm:ss"; String bucketName = "tweet-emotion-classification"; String key = "emotion"; AmazonS3 s3; public AmazonS3Handler() throws IOException { /* * This credentials provider implementation loads your AWS credentials * from a properties file at the root of your classpath. * * Important: Be sure to fill in your AWS access credentials in the * AwsCredentials.properties file before you try to run this * sample. * http://aws.amazon.com/security-credentials */ s3 = new AmazonS3Client(new ClasspathPropertiesFileCredentialsProvider()); Region usWest2 = Region.getRegion(Regions.US_WEST_2); s3.setRegion(usWest2); System.out.println("==========================================="); System.out.println("Getting Started with Amazon S3"); System.out.println("===========================================\n"); } public void putObject(File file, String key) throws IOException { try { // System.out.println("Creating bucket " + bucketName + "\n"); // s3.createBucket(bucketName); // System.out.println("Listing buckets"); // for (Bucket bucket : s3.listBuckets()) { // System.out.println(" - " + bucket.getName()); // } System.out.println(); System.out.println("Uploading a new object to S3 from a file\n"); s3.putObject( new PutObjectRequest(bucketName, key, file).withCannedAcl(CannedAccessControlList.PublicRead)); } catch (AmazonServiceException ase) { System.out.println("Caught an AmazonServiceException, which means your request made it " + "to Amazon S3, but was rejected with an error response for some reason."); System.out.println("Error Message: " + ase.getMessage()); System.out.println("HTTP Status Code: " + ase.getStatusCode()); System.out.println("AWS Error Code: " + ase.getErrorCode()); System.out.println("Error Type: " + ase.getErrorType()); System.out.println("Request ID: " + ase.getRequestId()); } catch (AmazonClientException ace) { System.out.println("Caught an AmazonClientException, which means the client encountered " + "a serious internal problem while trying to communicate with S3, " + "such as not being able to access the network."); System.out.println("Error Message: " + ace.getMessage()); } } public void listObject() { try { // System.out.println("Creating bucket " + bucketName + "\n"); // s3.createBucket(bucketName); // System.out.println("Listing buckets"); // for (Bucket bucket : s3.listBuckets()) { // System.out.println(" - " + bucket.getName()); // } // System.out.println(); // System.out.println("Uploading a new object to S3 from a file\n"); // s3.putObject(new PutObjectRequest(bucketName, key, createSampleFile()).withCannedAcl(CannedAccessControlList.PublicRead)); // System.out.println("Downloading an object"); // S3Object object = s3.getObject(new GetObjectRequest(bucketName, key)); // System.out.println("Content-Type: " + object.getObjectMetadata().getContentType()); // displayTextInputStream(object.getObjectContent()); System.out.println("Listing objects"); ObjectListing objectListing = s3 .listObjects(new ListObjectsRequest().withBucketName(bucketName).withPrefix("My")); for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) { System.out.println( " - " + objectSummary.getKey() + " " + "(size = " + objectSummary.getSize() + ")"); } System.out.println(); // System.out.println("Deleting an object\n"); // s3.deleteObject(bucketName, key); // System.out.println("Deleting bucket " + bucketName + "\n"); // s3.deleteBucket(bucketName); } catch (AmazonServiceException ase) { System.out.println("Caught an AmazonServiceException, which means your request made it " + "to Amazon S3, but was rejected with an error response for some reason."); System.out.println("Error Message: " + ase.getMessage()); System.out.println("HTTP Status Code: " + ase.getStatusCode()); System.out.println("AWS Error Code: " + ase.getErrorCode()); System.out.println("Error Type: " + ase.getErrorType()); System.out.println("Request ID: " + ase.getRequestId()); } catch (AmazonClientException ace) { System.out.println("Caught an AmazonClientException, which means the client encountered " + "a serious internal problem while trying to communicate with S3, " + "such as not being able to access the network."); System.out.println("Error Message: " + ace.getMessage()); } } private String now() { Calendar cal = Calendar.getInstance(); SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW); return sdf.format(cal.getTime()); } /** * Displays the contents of the specified input stream as text. * * @param input * The input stream to display as text. * * @throws IOException */ private static void displayTextInputStream(InputStream input) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(input)); while (true) { String line = reader.readLine(); if (line == null) break; System.out.println(" " + line); } System.out.println(); } }