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：
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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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希望本文所述对大家java程序设计有所帮助。
原文链接：https://blog.csdn.net/eclipse_c/article/details/51803886