Java 在Play框架上调用Amazon通知服务_Java_Playframework

Java 在Play框架上调用Amazon通知服务

java playframework

Java 在Play框架上调用Amazon通知服务,java,playframework,Java,Playframework,我想使用Play框架从Amazon简单通知服务（SNS）发送一条消息，我读到我必须使用WS-for REST API。然而，我对如何做到这一点感到困惑。有人能帮我解决这个问题吗？首先，您需要通过在build.sbt中添加以下行将SNS SDK添加到您的项目中： libraryDependencies += "com.amazonaws" % "aws-java-sdk-sns" % "1.11.271" 然后通过将服务注入控制器来使用服务，您的服务应该类似于： @Singleton publi

我想使用Play框架从Amazon简单通知服务（SNS）发送一条消息，我读到我必须使用WS-for REST API。然而，我对如何做到这一点感到困惑。有人能帮我解决这个问题吗？

首先，您需要通过在build.sbt中添加以下行将SNS SDK添加到您的项目中：

libraryDependencies += "com.amazonaws" % "aws-java-sdk-sns" % "1.11.271"

然后通过将服务注入控制器来使用服务，您的服务应该类似于：

@Singleton
public final class AmazonSNSService {
    // logging always a good thing to do
    private final Logger.ALogger logger = Logger.of(this.getClass());
    // this is what you have to use
    private final com.amazonaws.services.sns.AmazonSNS snsClient;
    private final String AMAZON_ARN;    
    @Inject
    public AmazonSNSService(Configuration configuration) { // or Config if play 2.6 and later
        // I set the aws config in application.conf and I read them here
        final String AWS_ACCESS_KEY = configuration.getString("aws_access_key");
        final String AWS_SECRET_KEY = configuration.getString("aws_secrect_key");
        snsClient = AmazonSNSClient.builder()
                .withRegion(Regions.US_EAST_1)
                .withCredentials(new AWSStaticCredentialsProvider(new BasicAWSCredentials(AWS_ACCESS_KEY, AWS_SECRET_KEY)))
                .build();
        AMAZON_ARN = configuration.getString("amazon_arn_config_key");
    }

}

然后，您可以使用

snsClient

和您想要的方法来创建主题：

public void createTopic(String topicName) {
    String topicARN = AMAZON_ARN + ":" + topicName;
    if (doesTopicExists(topicARN)) {
        logger.debug("TopicArn - already Exists" + topicARN);
    } else {
        //create a new SNS topic
        CreateTopicRequest createTopicRequest = new CreateTopicRequest(topicName);
        CreateTopicResult createTopicResult = snsClient.createTopic(createTopicRequest);

        //get request id for CreateTopicRequest from SNS metadata
        ResponseMetadata topicResponse = snsClient.getCachedResponseMetadata(createTopicRequest);
        logger.debug("CreateTopicArn - " + createTopicResult.getTopicArn());
    }
}

还有另一个订阅主题的示例：

public String subscribeToTopic(String topicName, String deviceEndpointARN) {

    String topicARN = AMAZON_ARN + ":" + topicName;
    //if topic does not exists create topic then subscribe
    if (!doesTopicExists(topicARN)) {
        createTopic(topicName);
    }
    return subscribeToTopic(topicARN, deviceEndpointARN);
}

想进入主题吗

public void publishToTopic(String message, String topicName) {

    String topicARN = AMAZON_ARN + ":" + topicName;
    //if topic does not exists create topic then publish to topic
    // or throw an exception, maybe it does not make sense to push to the topic that have no subscribers at all.
    if (!doesTopicExists(topicARN)) {
        createTopic(topicName);
    }
    //publish to an SNS topic
    PublishRequest publishRequest = new PublishRequest(topicARN, message);
    publishRequest.setMessageStructure("json");
    PublishResult publishResult = snsClient.publish(publishRequest);
    //print MessageId of message published to SNS topic
    logger.debug("Push Notification sent to TOPIC [" + topicARN + "] MessageId - [" + publishResult.getMessageId() + "] Message Body: " + message);

}

这就是我检查主题是否存在的方式：

private boolean doesTopicExists(String topicARN) {
    String nextToken = null;
    do {
        ListTopicsRequest request = new ListTopicsRequest();
        request.setNextToken(nextToken);

        ListTopicsResult listTopicsResult = snsClient.listTopics();
        List<Topic> topics = listTopicsResult.getTopics();

        for (Topic topic : topics) {
            if (topic.getTopicArn().equals(topicARN)) {
                return true;
            }
        }
        nextToken = request.getNextToken();
    } while (nextToken != null);
    return false;
}

private boolean doesTopicExists（字符串主题）{
字符串nextToken=null；
做{
ListTopicsRequest=新建ListTopicsRequest（）；
请求。setNextToken（nextToken）；
ListTopicsResult ListTopicsResult=snsClient.listTopics（）；
List topics=listTopicsResult.getTopics（）；
用于（主题：主题）{
if（topic.gettopicar（）.equals（topicARN））{
返回true；
}
}
nextToken=request.getNextToken（）；
}while（nextToken！=null）；
返回false；
}

更多信息，请查看它们的java文档并搜索示例，

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