Java 예제

포커스 모드

Java 예제 - Amazon Polly

이 예제에서는 Amazon Polly를 사용하여 Java 기반 애플리케이션에서 스피치를 스트리밍하는 방법을 보여 줍니다. 이 예제에서는 AWS SDK for Java를 사용하여 목록에서 선택한 음성으로 지정된 텍스트를 읽습니다.

표시된 코드는 주요 작업을 다루지만 최소한의 오류 검사만 수행합니다. Amazon Polly에서 오류가 발생하면 애플리케이션이 종료됩니다.

이 예제 애플리케이션을 실행하려면 다음이 필요합니다.

Java 8 Development Kit(JDK)
AWS SDK for Java
Apache Maven

애플리케이션을 테스트하려면

JDK에 JAVA_HOME 환경 변수가 설정되어 있어야 합니다.

예를 들어, Windows의 C:\Program Files\Java\jdk1.8.0_121에 JDK 1.8.0_121을 설치한 경우 명령 프롬프트에 다음을 입력합니다.
```
set JAVA_HOME=""C:\Program Files\Java\jdk1.8.0_121""
```
Linux의 /usr/lib/jvm/java8-openjdk-amd64에 JDK 1.8.0_121을 설치한 경우 명령 프롬프트에 다음을 입력합니다.
```
export JAVA_HOME=/usr/lib/jvm/java8-openjdk-amd64
```
명령줄에서 Maven을 실행하도록 Maven 환경 변수를 설정합니다.

예를 들어 Windows의 C:\Program Files\apache-maven-3.3.9에 Maven 3.3.9를 설치한 경우 다음을 입력합니다.
```
set M2_HOME=""C:\Program Files\apache-maven-3.3.9""
set M2=%M2_HOME%\bin
set PATH=%M2%;%PATH%
```
Linux의 /home/ec2-user/opt/apache-maven-3.3.9에 Maven 3.3.9를 설치한 경우 다음을 입력합니다.
```
export M2_HOME=/home/ec2-user/opt/apache-maven-3.3.9
export M2=$M2_HOME/bin
export PATH=$M2:$PATH
```
이름이 polly-java-demo인 디렉터리를 새로 생성합니다.

polly-java-demo 디렉터리에 이름이 pom.xml인 파일을 생성하고 그 안에 다음 코드를 붙여 넣습니다.


<project xmlns="http://maven.apache.org/POM/4.0.0" 
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.amazonaws.polly</groupId>
	<artifactId>java-demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencies>
		<!-- https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk-polly -->
		<dependency>
			<groupId>com.amazonaws</groupId>
			<artifactId>aws-java-sdk-polly</artifactId>
			<version>1.11.77</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/com.googlecode.soundlibs/jlayer -->
		<dependency>
			<groupId>com.googlecode.soundlibs</groupId>
			<artifactId>jlayer</artifactId>
			<version>1.0.1-1</version>
		</dependency>

	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>exec-maven-plugin</artifactId>
				<version>1.2.1</version>
				<executions>
					<execution>
						<goals>
							<goal>java</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<mainClass>com.amazonaws.demos.polly.PollyDemo</mainClass>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

src/main/java/com/amazonaws/demos에 이름이 polly인 디렉터리를 새로 생성합니다.

polly 디렉터리에서 이름이 PollyDemo.java인 새 Java 소스 파일을 만들고 그 안에 다음 코드를 붙여 넣습니다.


package com.amazonaws.demos.polly;

import java.io.IOException;
import java.io.InputStream;

import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.polly.AmazonPollyClient;
import com.amazonaws.services.polly.model.DescribeVoicesRequest;
import com.amazonaws.services.polly.model.DescribeVoicesResult;
import com.amazonaws.services.polly.model.OutputFormat;
import com.amazonaws.services.polly.model.SynthesizeSpeechRequest;
import com.amazonaws.services.polly.model.SynthesizeSpeechResult;
import com.amazonaws.services.polly.model.Voice;

import javazoom.jl.player.advanced.AdvancedPlayer;
import javazoom.jl.player.advanced.PlaybackEvent;
import javazoom.jl.player.advanced.PlaybackListener;

public class PollyDemo {

	private final AmazonPollyClient polly;
	private final Voice voice;
	private static final String SAMPLE = "Congratulations. You have successfully built this working demo 
	of Amazon Polly in Java. Have fun building voice enabled apps with Amazon Polly (that's me!), and always 
	look at the AWS website for tips and tricks on using Amazon Polly and other great services from AWS";

	public PollyDemo(Region region) {
		// create an Amazon Polly client in a specific region
		polly = new AmazonPollyClient(new DefaultAWSCredentialsProviderChain(), 
		new ClientConfiguration());
		polly.setRegion(region);
		// Create describe voices request.
		DescribeVoicesRequest describeVoicesRequest = new DescribeVoicesRequest();

		// Synchronously ask Amazon Polly to describe available TTS voices.
		DescribeVoicesResult describeVoicesResult = polly.describeVoices(describeVoicesRequest);
		voice = describeVoicesResult.getVoices().get(0);
	}

	public InputStream synthesize(String text, OutputFormat format) throws IOException {
		SynthesizeSpeechRequest synthReq = 
		new SynthesizeSpeechRequest().withText(text).withVoiceId(voice.getId())
				.withOutputFormat(format).withEngine("neural");
		SynthesizeSpeechResult synthRes = polly.synthesizeSpeech(synthReq);

		return synthRes.getAudioStream();
	}

	public static void main(String args[]) throws Exception {
		//create the test class
		PollyDemo helloWorld = new PollyDemo(Region.getRegion(Regions.US_EAST_1));
		//get the audio stream
		InputStream speechStream = helloWorld.synthesize(SAMPLE, OutputFormat.Mp3);

		//create an MP3 player
		AdvancedPlayer player = new AdvancedPlayer(speechStream,
				javazoom.jl.player.FactoryRegistry.systemRegistry().createAudioDevice());

		player.setPlayBackListener(new PlaybackListener() {
			@Override
			public void playbackStarted(PlaybackEvent evt) {
				System.out.println("Playback started");
				System.out.println(SAMPLE);
			}
			
			@Override
			public void playbackFinished(PlaybackEvent evt) {
				System.out.println("Playback finished");
			}
		});
		
		
		// play it!
		player.play();
		
	}
}