Java 範例

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Java 範例 - Amazon Polly

此範例示範如何使用 Amazon Polly 從 Java 型應用程式串流語音。此範例使用 AWS SDK for Java，使用從清單中選取的語音來讀取指定的文字。

顯示的程式碼包括主要工作，但僅進行最基本的錯誤檢查。如果 Amazon Polly 發生錯誤，應用程式會終止。

若要執行此範例應用程式，您需要以下項目：

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

若要測試應用程式

確認 JAVA_HOME 環境變數已針對 JDK 設定。

例如，如果您在 Windows 中將 JDK 1.8.0_121 安裝於 C:\Program Files\Java\jdk1.8.0_121，您可在命令提示輸入以下命令：
```
set JAVA_HOME=""C:\Program Files\Java\jdk1.8.0_121""
```
如果您在 Linux 中將 JDK 1.8.0_121 安裝於 /usr/lib/jvm/java8-openjdk-amd64，您可在命令提示輸入以下命令：
```
export JAVA_HOME=/usr/lib/jvm/java8-openjdk-amd64
```
設定 Maven 環境變數，從命令列執行 Maven。

例如，如果您在 Windows 中將 Maven 3.3.9 安裝於 C:\Program Files\apache-maven-3.3.9，您可以輸入以下命令：
```
set M2_HOME=""C:\Program Files\apache-maven-3.3.9""
set M2=%M2_HOME%\bin
set PATH=%M2%;%PATH%
```
如果您在 Linux 中將 Maven 3.3.9 安裝於 /home/ec2-user/opt/apache-maven-3.3.9，您可以輸入以下命令：
```
export M2_HOME=/home/ec2-user/opt/apache-maven-3.3.9
export M2=$M2_HOME/bin
export PATH=$M2:$PATH
```
建立名為 polly-java-demo 的新目錄。

在 polly-java-demo 目錄中，建立名為 pom.xml 的新檔案，並將以下程式碼貼入其中：


<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>

在 src/main/java/com/amazonaws/demos 建立名為 polly 的新目錄。

在 polly 目錄中，建立名為 PollyDemo.java 的新 Java 來源檔案，並在以下程式碼貼中上：


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();
		
	}
}