本文实例讲述了Java实现的百度语音识别功能。分享给大家供大家参考，具体如下：
SDK以及示例代码下载地址： http://yuyin.baidu.com/sdk
最近一直在搞java，就选择了java工程。将代码拷过去。同时复制文件“test.pcm”到工程目录下。就基本上可以了。
注：test.pcm是语音文件，可以用audacity软件打开，选择 文件->导入->裸数据。 设置采样率为8000Hz。点击播放就能听见声音了。
这个时候程序跑起来还有问题，需要将apiKey 以及secretKey填写上。这两个值是你申请应用对应的分配好的。
cuid填本机mac地址就可以了，这个值我试过好像无所谓没啥要求。
程序能跑起来，并且按照正常返回识别的语音结果。但是返回结果的编码为GBK，所以汉字显示为乱码，需要对其进行一次转码。转码的代码是我自己加上去的。
下面贴代码：
package com.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.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 Sample { private static final String serverURL = "http://vop.baidu.com/server_api"; private static String token = ""; private static final String testFileName = "test.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 = ""; 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("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=8000"); 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(getUtf8String(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; } // GBK编码转为UTF-8 private static String getUtf8String(String s) throws UnsupportedEncodingException { StringBuffer sb = new StringBuffer(); sb.append(s); String xmlString = ""; String xmlUtf8 = ""; xmlString = new String(sb.toString().getBytes("GBK")); xmlUtf8 = URLEncoder.encode(xmlString , "GBK"); return URLDecoder.decode(xmlUtf8, "UTF-8"); }} 希望本文所述对大家java程序设计有所帮助。
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