Java实现的百度语音识别功能示例

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");

									  }

									}