Contoh Java

Contoh ini menunjukkan cara menggunakan Amazon Polly untuk melakukan streaming ucapan dari aplikasi berbasis Java. Contoh menggunakan AWS SDK for Javauntuk membaca teks yang ditentukan menggunakan suara yang dipilih dari daftar.

Kode yang ditampilkan mencakup tugas-tugas utama, tetapi hanya melakukan pemeriksaan kesalahan minimal. Jika Amazon Polly mengalami kesalahan, aplikasi akan berakhir.

Untuk menjalankan aplikasi contoh ini, Anda memerlukan yang berikut:

• Kit Pengembangan Java 8 Java (JDK)

• AWS SDK for Java

• Apache Maven

Untuk menguji aplikasi

1. Pastikan bahwa variabel lingkungan JAVA_HOME diatur untuk JDK.

   Misalnya, jika Anda menginstal JDK 1.8.0_121 pada Windows diC:\Program Files\Java\jdk1.8.0_121, Anda akan mengetik yang berikut di command prompt:

   set JAVA_HOME=""C:\Program Files\Java\jdk1.8.0_121""

   Jika Anda menginstal JDK 1.8.0_121 di Linux di/usr/lib/jvm/java8-openjdk-amd64, Anda akan mengetik yang berikut di command prompt:

   export JAVA_HOME=/usr/lib/jvm/java8-openjdk-amd64

2. Atur variabel lingkungan Maven untuk menjalankan Maven dari baris perintah.

   Misalnya, jika Anda menginstal Maven 3.3.9 pada Windows diC:\Program Files\apache-maven-3.3.9, Anda akan mengetik yang berikut ini:

   set M2_HOME=""C:\Program Files\apache-maven-3.3.9""
   set M2=%M2_HOME%\bin
   set PATH=%M2%;%PATH%

   Jika Anda menginstal Maven 3.3.9 di Linux di/home/ec2-user/opt/apache-maven-3.3.9, Anda akan mengetik yang berikut:

   export M2_HOME=/home/ec2-user/opt/apache-maven-3.3.9
   export M2=$M2_HOME/bin
   export PATH=$M2:$PATH

3. Buat direktori baru yang disebutpolly-java-demo.

4. Dalam polly-java-demo direktori, buat file baru bernamapom.xml, dan paste kode berikut ke dalamnya:

   <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>
    

5. Buat direktori baru yang disebut polly disrc/main/java/com/amazonaws/demos.

6. Di polly direktori, buat file sumber Java baru yang disebutPollyDemo.java, dan tempel dalam kode berikut:

   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();
   		
   	}
   } 

7. Kembali ke polly-java-demo direktori untuk membersihkan, mengkompilasi, dan menjalankan demo:

   mvn clean compile exec:java