科大讯飞和百度语音平台语音识别Java调用记录

1、科大讯飞平台：http://www.xfyun.cn/doccenter/java
     注册并创建应用，下载SDK，选择语音听写+Java+创建的应用(APPID)；
     未提交审核的应用，服务量会有500次/日的限制，开发完成后提交审核解除限制；

     SDK里面的Sample功能直接导入eclipse，编译执行，支持粤语；

2、百度http://yuyin.baidu.com/
     注册并 创建应用，下载REST API的压缩文档，提供Http接口支持整段录音文件的识别；
     原始语音的录音格式目前支持评测 8k/16k 采样率 16bit 位深的单声道语音；
     压缩格式支持：pcm（不压缩）、wav、opus、speex、amr、x-flac；
     语音识别服务开通成功后即可获得 50000次/日 的在线识别调用配额；

     http://yuyin.baidu.com/docs/asr/57

     Sample代码

    

package org.asr.baidu.speech.serviceapi;import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL;import javax.xml.bind.DatatypeConverter;import org.asr.json.JSONObject;public class Sample {private static final String serverURL = "http://vop.baidu.com/server_api";private static String token = "";//private static final String testFileName = "test.pcm";private static final String testFileName = "D:\\tmp\\1.wav";//put your own params hereprivate static final String apiKey = "";private static final String secretKey = "";private static final String cuid = "";public static void main(String[] args) throws Exception {getToken();//method1();method2();}private static void getToken() throws Exception {String getTokenURL = "https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials" + "&client_id=" + apiKey + "&client_secret=" + secretKey;HttpURLConnection conn = (HttpURLConnection) new URL(getTokenURL).openConnection();token = new JSONObject(printResponse(conn)).getString("access_token");}private static void method1() throws Exception {File pcmFile = new File(testFileName);HttpURLConnection conn = (HttpURLConnection) new URL(serverURL).openConnection();// construct paramsJSONObject params = new JSONObject();params.put("format", "pcm");params.put("rate", 8000);params.put("channel", "1");params.put("token", token);params.put("cuid", cuid);params.put("len", pcmFile.length());params.put("speech", DatatypeConverter.printBase64Binary(loadFile(pcmFile)));// add request headerconn.setRequestMethod("POST");conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");conn.setDoInput(true);conn.setDoOutput(true);// send requestDataOutputStream wr = new DataOutputStream(conn.getOutputStream());wr.writeBytes(params.toString());wr.flush();wr.close();printResponse(conn);}private static void method2() throws Exception {File pcmFile = new File(testFileName);HttpURLConnection conn = (HttpURLConnection) new URL(serverURL+ "?cuid=" + cuid + "&token=" + token).openConnection();// add request headerconn.setRequestMethod("POST");conn.setRequestProperty("Content-Type", "audio/pcm; rate=8000");conn.setDoInput(true);conn.setDoOutput(true);// send requestDataOutputStream wr = new DataOutputStream(conn.getOutputStream());wr.write(loadFile(pcmFile));wr.flush();wr.close();printResponse(conn);}private static String printResponse(HttpURLConnection conn) throws Exception {if (conn.getResponseCode() != 200) {// request errorreturn "";}InputStream is = conn.getInputStream();BufferedReader rd = new BufferedReader(new InputStreamReader(is));String line;StringBuffer response = new StringBuffer();while ((line = rd.readLine()) != null) {response.append(line);response.append('\r');}rd.close();System.out.println(new JSONObject(response.toString()).toString(4));return response.toString();}private static byte[] loadFile(File file) throws IOException {InputStream is = new FileInputStream(file);long length = file.length();byte[] bytes = new byte[(int) length];int offset = 0;int numRead = 0;while (offset < bytes.length&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {offset += numRead;}if (offset < bytes.length) {is.close();throw new IOException("Could not completely read file " + file.getName());}is.close();return bytes;} }

3）两个平台都提供相对详细的开发者教程，Demo也可以直接使用，相对来说科大讯飞平台支持方言和语音训练，百度暂时没发现有语音训练功能。

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