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：

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");
  }
}

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