Java tutorial
/* * Copyright 2010-2012 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.util.HashSet; import java.util.List; import java.util.Set; import twitter4j.Query; import twitter4j.QueryResult; import twitter4j.Tweet; import twitter4j.Twitter; import twitter4j.TwitterFactory; import com.amazonaws.AmazonClientException; import com.amazonaws.AmazonServiceException; import com.amazonaws.auth.AWSCredentials; import com.amazonaws.auth.PropertiesCredentials; import com.amazonaws.services.ec2.AmazonEC2; import com.amazonaws.services.ec2.AmazonEC2Client; import com.amazonaws.services.ec2.model.DescribeAvailabilityZonesResult; import com.amazonaws.services.ec2.model.DescribeInstancesResult; import com.amazonaws.services.ec2.model.Instance; import com.amazonaws.services.ec2.model.Reservation; 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.ObjectListing; import com.amazonaws.services.s3.model.S3ObjectSummary; import com.amazonaws.services.simpledb.AmazonSimpleDB; import com.amazonaws.services.simpledb.AmazonSimpleDBClient; import com.amazonaws.services.simpledb.model.DomainMetadataRequest; import com.amazonaws.services.simpledb.model.DomainMetadataResult; import com.amazonaws.services.simpledb.model.ListDomainsRequest; import com.amazonaws.services.simpledb.model.ListDomainsResult; /** * Welcome to your new AWS Java SDK based project! * * This class is meant as a starting point for your console-based application that * makes one or more calls to the AWS services supported by the Java SDK, such as EC2, * SimpleDB, and S3. * * In order to use the services in this sample, you need: * * - A valid Amazon Web Services account. You can register for AWS at: * https://aws-portal.amazon.com/gp/aws/developer/registration/index.html * * - Your account's Access Key ID and Secret Access Key: * http://aws.amazon.com/security-credentials * * - A subscription to Amazon EC2. You can sign up for EC2 at: * http://aws.amazon.com/ec2/ * * - A subscription to Amazon SimpleDB. You can sign up for Simple DB at: * http://aws.amazon.com/simpledb/ * * - A subscription to Amazon S3. You can sign up for S3 at: * http://aws.amazon.com/s3/ */ public class AwsConsoleApp { /* * 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 */ static AmazonEC2 ec2; static AmazonS3 s3; static AmazonSimpleDB sdb; /** * The only information needed to create a client are security credentials * consisting of the AWS Access Key ID and Secret Access Key. All other * configuration, such as the service endpoints, are performed * automatically. Client parameters, such as proxies, can be specified in an * optional ClientConfiguration object when constructing a client. * * @see com.amazonaws.auth.BasicAWSCredentials * @see com.amazonaws.auth.PropertiesCredentials * @see com.amazonaws.ClientConfiguration */ private static void init() throws Exception { AWSCredentials credentials = new PropertiesCredentials( AwsConsoleApp.class.getResourceAsStream("AwsCredentials.properties")); ec2 = new AmazonEC2Client(credentials); s3 = new AmazonS3Client(credentials); sdb = new AmazonSimpleDBClient(credentials); } public static void main(String[] args) throws Exception { System.out.println("==========================================="); System.out.println("Welcome to the AWS Java SDK!"); System.out.println("==========================================="); init(); /* * Amazon EC2 * * The AWS EC2 client allows you to create, delete, and administer * instances programmatically. * * In this sample, we use an EC2 client to get a list of all the * availability zones, and all instances sorted by reservation id. */ try { DescribeAvailabilityZonesResult availabilityZonesResult = ec2.describeAvailabilityZones(); System.out.println("You have access to " + availabilityZonesResult.getAvailabilityZones().size() + " Availability Zones."); DescribeInstancesResult describeInstancesRequest = ec2.describeInstances(); List<Reservation> reservations = describeInstancesRequest.getReservations(); Set<Instance> instances = new HashSet<Instance>(); for (Reservation reservation : reservations) { instances.addAll(reservation.getInstances()); } System.out.println("You have " + instances.size() + " Amazon EC2 instance(s) running."); } catch (AmazonServiceException ase) { System.out.println("Caught Exception: " + ase.getMessage()); System.out.println("Reponse Status Code: " + ase.getStatusCode()); System.out.println("Error Code: " + ase.getErrorCode()); System.out.println("Request ID: " + ase.getRequestId()); } /* * Amazon SimpleDB * * The AWS SimpleDB client allows you to query and manage your data * stored in SimpleDB domains (similar to tables in a relational DB). * * In this sample, we use a SimpleDB client to iterate over all the * domains owned by the current user, and add up the number of items * (similar to rows of data in a relational DB) in each domain. */ try { ListDomainsRequest sdbRequest = new ListDomainsRequest().withMaxNumberOfDomains(100); ListDomainsResult sdbResult = sdb.listDomains(sdbRequest); int totalItems = 0; for (String domainName : sdbResult.getDomainNames()) { DomainMetadataRequest metadataRequest = new DomainMetadataRequest().withDomainName(domainName); DomainMetadataResult domainMetadata = sdb.domainMetadata(metadataRequest); totalItems += domainMetadata.getItemCount(); } System.out.println("You have " + sdbResult.getDomainNames().size() + " Amazon SimpleDB domain(s)" + " containing a total of " + totalItems + " items."); } catch (AmazonServiceException ase) { System.out.println("Caught Exception: " + ase.getMessage()); System.out.println("Reponse Status Code: " + ase.getStatusCode()); System.out.println("Error Code: " + ase.getErrorCode()); System.out.println("Request ID: " + ase.getRequestId()); } /* * Amazon S3 * * The AWS S3 client allows you to manage buckets and programmatically * put and get objects to those buckets. * * In this sample, we use an S3 client to iterate over all the buckets * owned by the current user, and all the object metadata in each * bucket, to obtain a total object and space usage count. This is done * without ever actually downloading a single object -- the requests * work with object metadata only. */ try { List<Bucket> buckets = s3.listBuckets(); long totalSize = 0; int totalItems = 0; for (Bucket bucket : buckets) { /* * In order to save bandwidth, an S3 object listing does not * contain every object in the bucket; after a certain point the * S3ObjectListing is truncated, and further pages must be * obtained with the AmazonS3Client.listNextBatchOfObjects() * method. */ ObjectListing objects = s3.listObjects(bucket.getName()); do { for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) { totalSize += objectSummary.getSize(); totalItems++; } objects = s3.listNextBatchOfObjects(objects); } while (objects.isTruncated()); } System.out.println("You have " + buckets.size() + " Amazon S3 bucket(s), " + "containing " + totalItems + " objects with a total size of " + totalSize + " bytes."); } catch (AmazonServiceException ase) { /* * AmazonServiceExceptions represent an error response from an AWS * services, i.e. your request made it to AWS, but the AWS service * either found it invalid or encountered an error trying to execute * it. */ 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) { /* * AmazonClientExceptions represent an error that occurred inside * the client on the local host, either while trying to send the * request to AWS or interpret the response. For example, if no * network connection is available, the client won't be able to * connect to AWS to execute a request and will throw an * AmazonClientException. */ System.out.println("Error Message: " + ace.getMessage()); } } public static void searchTweets(String searchString) throws Exception { Twitter twitter = new TwitterFactory().getInstance(); QueryResult result; Query query = new Query(searchString); query.setRpp(100); for (int i = 1; i < 16; i++) { System.out.println("CURRENT PAGE: " + i); query.setPage(i); result = twitter.search(query); for (Tweet tweet : result.getTweets()) { System.out.println(tweet.getFromUser() + ":" + tweet.getText()); } } } }