基于java的百度语音识别示例

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");    }}