基于java的百度语音识别示例

最近在弄语音识别这块，然后就看了下百度的语音识别：

这里介绍了使用java实验语音识别。首先你需要的东西：

1、一个pcm或这个wav格式的语音文件（我使用的是官网提供的案列16k.pcm）点击下载。

2、准备sdk包（将这个包的jar包通过build path附上就可以）点击下载；

3、需要在百度云上申请一个百度语音的项目，然后将apikey和secretkey复制到项目中。

注意的是：如果我的语音文件是16k的，rate就是16000，8k的rate就是8000（可以参考官方文档）.cuid填本机mac地址就可以了，这个值没有什么要求，我用的就是sercretkey。

下面代码：

package test;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.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLDecoder;import java.net.URLEncoder;import javax.xml.bind.DatatypeConverter;import org.json.JSONObject;public class demo2 {        private static final String serverURL = "http://vop.baidu.com/server_api";      private static String token = "";      private static final String testFileName = "D:\\workspace\\test2\\src\\16k.pcm"; // 百度语音提供技术支持      //put your own params here      // 下面3个值要填写自己申请的app对应的值      private static final String apiKey = "jrDWBaBvmhPBYQRjlT7Fk1yk";      private static final String secretKey = "wI2MZhBGKthjBFdyo1miAFsforCesYbX";      private static final String cuid = "wI2MZhBGKthjBFdyo1miAFsforCesYbX";        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");          System.out.println(token);    }        private static void method1() throws Exception {          File pcmFile = new File(testFileName);         System.out.println(pcmFile.exists());        HttpURLConnection conn = (HttpURLConnection) new URL(serverURL).openConnection();            // construct params          JSONObject params = new JSONObject();          params.put("format", "pcm");          params.put("rate", 16000);          params.put("channel", "1");          params.put("token", token);          params.put("lan", "zh");          params.put("cuid", cuid);          params.put("len", pcmFile.length());          params.put("speech", DatatypeConverter.printBase64Binary(loadFile(pcmFile)));            // add request header          conn.setRequestMethod("POST");          conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");            conn.setDoInput(true);          conn.setDoOutput(true);            // send request          DataOutputStream 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 header          conn.setRequestMethod("POST");          conn.setRequestProperty("Content-Type", "audio/pcm; rate=16000");            conn.setDoInput(true);          conn.setDoOutput(true);            // send request          DataOutputStream wr = new DataOutputStream(conn.getOutputStream());          wr.write(loadFile(pcmFile));          wr.flush();          wr.close();            System.out.println(printResponse(conn));      }        private static String printResponse(HttpURLConnection conn) throws Exception {          if (conn.getResponseCode() != 200) {              // request error              System.out.println("conn.getResponseCode() = " + conn.getResponseCode());              return "";          }          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;      }  }  

运行结果：

{    "scope": "public brain_all_scope audio_voice_assistant_get audio_tts_post wise_adapt lebo_resource_base lightservice_public hetu_basic lightcms_map_poi kaidian_kaidian ApsMisTest_Test权限 vis-classify_flower bnstest_fasf lpq_开放",    "session_secret": "a1872f3e791eeb5adf327086e6a0d769",    "expires_in": 2592000,    "refresh_token": "25.f74b044ed07383f7643b8259fb9af970.315360000.1827655515.282335-10467473",    "session_key": "9mzdWT+D4w5xoNHb1JejPBZ1qZKj90nUTAVDhweqqQJjH1o4PvJAYHgT8QynTP9BCVSjxA5tihkh2QCabkExrQFTpcK1VQ==",    "access_token": "24.be8efa5a534453370396a4accce50aa6.2592000.1514887515.282335-10467473"}24.be8efa5a534453370396a4accce50aa6.2592000.1514887515.282335-10467473true{    "result": ["北京科技馆，"],    "err_msg": "success.",    "sn": "592584910701512295515",    "err_no": 0,    "corpus_no": "6495259779570311967"}{    "result": ["北京科技馆，"],    "err_msg": "success.",    "sn": "587847696871512295516",    "err_no": 0,    "corpus_no": "6495259783832855718"}{"corpus_no":"6495259783832855718","err_msg":"success.","err_no":0,"result":["北京科技馆，"],"sn":"587847696871512295516"}