Query baidu web service - Java Cloud

Java examples for Cloud:Baidu

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Description

Query baidu web service

Demo Code

import org.json.JSONObject;

import javax.xml.bind.DatatypeConverter;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;


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";
    //put your own params here
    private static final String apiKey = "apiKey";
    private static final String secretKey = "secretKey";
    private static final String cuid = "cuid";

    public static void main(String[] args) throws Exception {
        getToken();//from   w w  w.j  a va2 s  . com
        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");
        System.out.println(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", "amr");
        params.put("rate", 8000);
        params.put("channel", "1");
        params.put("token", token);
        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();

        printResponse(conn);
    }

    private static String printResponse(HttpURLConnection conn)
            throws Exception {
        if (conn.getResponseCode() != 200) {
            // request error
            System.out.println(conn.getResponseCode());
        }
        InputStream is = conn.getInputStream();
        BufferedReader rd = new BufferedReader(new InputStreamReader(is));
        String line;
        StringBuffer response = new StringBuffer();
        while ((line = rd.readLine()) != null) {
            System.out.println("Have response!");
            response.append(line);
            response.append('\r');
        }
        rd.close();
        System.out.println("Finish!");
        return new JSONObject(response.toString()).toString(4);
    }

    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;
    }
}

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