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：

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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");
  }
}

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