文字转语音播报模块（一）:阿里云nls服务使用示例

一、业务场景

最近笔者在业务中涉及到语音告警的模块，需要讲告警内容以文件或流形式返回给前端进行语音播报，具体的分析与处理如下

二、业务分析

首先告警内容提示信息这里做的处理是通过专门字段去存储、编辑，根据拟定好的代码逻辑判断是否触发语音告警操作，比较重要的是考虑用那种api实现文字转语音功能，这里笔者选用的是阿里云的nls语音服务。

三、解决方案

1、pom文件引入

<dependency><groupId>com.alibaba.nls</groupId><artifactId>nls-sdk-tts</artifactId><version>2.2.1</version>
</dependency>

2、yml文件配置添加

#  nls语音配置
ali:nls:##产品相关信息app-key: access-key-id: access-key-secret: ##语音信息（声音类型、语速）voice: sijiapitch-rate: -68speech-rate: 0

3、实体类构建

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;@Data
@Component
@ConfigurationProperties(prefix = "ali.nls")
public class NlsProperties {private String appKey;private String accessKeyId;private String accessKeySecret;private String url;//发音人private String voice;//语调，范围是-500~500，可选，默认是0private Integer pitchRate;//语速，范围是-500~500，默认是0private Integer speechRate;}

4、config类构建

import com.demo.NlsProperties;
import com.demo.NlsTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.StringRedisTemplate;@Configuration
public class NlsAutoConfiguration {@Beanpublic NlsTemplate nlsTemplate(NlsProperties nlsProperties, StringRedisTemplate stringRedisTemplate){return new NlsTemplate(nlsProperties,stringRedisTemplate);}}

5、服务类构建

import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.alibaba.nls.client.AccessToken;
import com.alibaba.nls.client.protocol.OutputFormatEnum;
import com.alibaba.nls.client.protocol.SampleRateEnum;
import com.demo.NlsProperties;
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import okhttp3.*;
import org.springframework.data.redis.core.StringRedisTemplate;
import java.io.*;
import java.util.Date;@Slf4j
@RequiredArgsConstructor
public class NlsTemplate {private final NlsProperties nlsProperties;private final StringRedisTemplate stringRedisTemplate;/*** HTTPS POST请求*/public byte[] processPOSTRequest(String text) {/*** 设置HTTPS POST请求：* 1.使用HTTPS协议* 2.语音合成服务域名：nls-gateway-cn-shanghai.aliyuncs.com* 3.语音合成接口请求路径：/stream/v1/tts* 4.设置必须请求参数：appkey、token、text、format、sample_rate* 5.设置可选请求参数：voice、volume、speech_rate、pitch_rate*/String url = "https://nls-gateway-cn-shenzhen.aliyuncs.com/stream/v1/tts";JSONObject taskObject = new JSONObject();taskObject.putOpt("appkey", nlsProperties.getAppKey());taskObject.putOpt("token", this.getToken());taskObject.putOpt("text", text);taskObject.putOpt("format", OutputFormatEnum.MP3.getName());taskObject.putOpt("voice", nlsProperties.getVoice());taskObject.putOpt("sample_rate", SampleRateEnum.SAMPLE_RATE_16K.value);// speech_rate 语速，范围是-500~500，可选，默认是0。taskObject.putOpt("speech_rate", nlsProperties.getSpeechRate());// pitch_rate 语调，范围是-500~500，可选，默认是0。taskObject.putOpt("pitch_rate", nlsProperties.getPitchRate());String bodyContent = JSONUtil.toJsonStr(taskObject);System.out.println("POST Body Content: " + bodyContent);RequestBody reqBody = RequestBody.create(MediaType.parse("application/json"), bodyContent);Request request = new Request.Builder().url(url).header("Content-Type", "application/json").post(reqBody).build();try {OkHttpClient client = new OkHttpClient();Response response = client.newCall(request).execute();String contentType = response.header("Content-Type");byte[] data = null;if ("audio/mpeg".equals(contentType)) {data = response.body().bytes();System.out.println("The POST request succeed!");} else {String errorMessage = response.body().string();System.out.println("The POST request failed: " + errorMessage);}response.close();if (data != null && data.length > 0) {//                String filePath = "D:/test.wav";  //音频文件保存路径及文件名
//                saveFile(data, filePath);  //调用函数将音频保存到本地return data;}} catch (Exception e) {e.printStackTrace();}return null;}/*** token暂存redis中*** */@SneakyThrowsprivate String getToken() {String key = "NLS_TOKEN";Boolean hasKey = stringRedisTemplate.hasKey(key);if (BooleanUtil.isTrue(hasKey)) {return stringRedisTemplate.opsForValue().get(key);}AccessToken token = new AccessToken(nlsProperties.getAccessKeyId(), nlsProperties.getAccessKeySecret());token.apply();String accessToken = token.getToken();stringRedisTemplate.opsForValue().set(key, accessToken);stringRedisTemplate.expireAt(key, new Date(token.getExpireTime() * 1000));return accessToken;}/*** 文件转换与生成** */public static void saveFile(byte[] bytes, String filePath) {try {FileOutputStream fos = new FileOutputStream(new File(filePath));fos.write(bytes);fos.close();} catch (IOException e) {e.printStackTrace();}}}

具体的配置可以参考官方文档 https://help.aliyun.com/product/30413.html?spm=a2c4g.750001.0.0.61184fadyUJTlQ ；
如果服务会频繁使用，可以把获取到阿里云token暂存在redis使用。

四、尾言

以上是语音合成业务的大致实现方案，感谢聆听和指正。后续笔者尝试或有改进的方案也会同步上去。