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百度语音识别REST API使用方法(含JAVA代码)——不需要集成SDK的方法
上一篇文章http://blog.csdn.net/zpf8861/article/details/32322089已经介绍了百度语音识别REST API的使用步骤和功能介绍,这篇文章主要通过一个实例代码来展示如何使用该API。
本文代码为JAVA版,可以用于Android应用开发中,下面介绍其中重要的代码。
获得Token
其中apiKey和secretKey是从百度开放平台获得的,获得方法参看上一篇文章。
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"); }现在假设语音文件为testFileName =test.pcm,保存在一个文件中,该文件可以有很多方法获得,比如在Android中调用录音相关的API,下面代码展示了如何通过Http网络请求获得识别结果。
Http连接采用Post方式,首先需要设定参数,然后上传本地的语音数据。
private static void method1() throws Exception { File pcmFile = new File(testFileName); HttpURLConnection conn = (HttpURLConnection) new URL(serverURL).openConnection(); // construct params JSONObject 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 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); }然后是获得响应的方法,具体处理识别结果
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=8000"); conn.setDoInput(true); conn.setDoOutput(true); // send request DataOutputStream wr = new DataOutputStream(conn.getOutputStream()); wr.write(loadFile(pcmFile)); wr.flush(); wr.close(); printResponse(conn); }
下面展示了该demo的全部代码,开发者可以填入自己的KEY尝试使用。
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"; //put your own params here private 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 params JSONObject 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 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=8000"); conn.setDoInput(true); conn.setDoOutput(true); // send request DataOutputStream wr = new DataOutputStream(conn.getOutputStream()); wr.write(loadFile(pcmFile)); wr.flush(); wr.close(); printResponse(conn); } private static void printResponse(HttpURLConnection conn) throws Exception { if (conn.getResponseCode() != 200) { // request error } 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)); } private static byte[] loadFile(File file) throws IOException { InputStream is = new FileInputStream(file); long length = file.length();r 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; } }
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