Java调用百度API实现人脸识别

1. 进入百度AI开放平台，成为开发者。地址：http://ai.baidu.com
2. 进入控制台，创建应用，获取AppID，API Key，Secret Key。
   
3. 获取token。

   import org.json.JSONObject;
   import java.io.BufferedReader;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import java.util.List;
   import java.util.Map;
   /**
    * 获取token类
    */
   public class AuthService {
       public static void main(String[] args) {
           //24.5005ca6593157e59e757fe8920cd5520.2592000.1548399012.282335-15274280
           System.out.println(getAuth());
       }
   
       /**
        * 获取权限token
        * @return 返回示例：
        * {
        * "access_token": "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567",
        * "expires_in": 2592000
        * }
        */
       public static String getAuth() {
           // 官网获取的 API Key 更新为你注册的
           String clientId = "CW4snqQsmy5Tps8lObn1sGex";
           // 官网获取的 Secret Key 更新为你注册的
           String clientSecret = "CNxxjG7sUIv8jlFPWdvo0DRQmqacMx8l ";
           return getAuth(clientId, clientSecret);
       }
   
       /**
        * 获取API访问token
        * 该token有一定的有效期，需要自行管理，当失效时需重新获取.
        * @param ak - 百度云官网获取的 API Key
        * @param sk - 百度云官网获取的 Securet Key
        * @return assess_token 示例：
        * "24.460da4889caad24cccdb1fea17221975.2592000.1491995545.282335-1234567"
        */
       public static String getAuth(String ak, String sk) {
           // 获取token地址
           String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
           String getAccessTokenUrl = authHost
                   // 1. grant_type为固定参数
                   + "grant_type=client_credentials"
                   // 2. 官网获取的 API Key
                   + "&client_id=" + ak
                   // 3. 官网获取的 Secret Key
                   + "&client_secret=" + sk;
           try {
               URL realUrl = new URL(getAccessTokenUrl);
               // 打开和URL之间的连接
               HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
               connection.setRequestMethod("GET");
               connection.connect();
               // 获取所有响应头字段
               Map<String, List<String>> map = connection.getHeaderFields();
               // 遍历所有的响应头字段
               for (String key : map.keySet()) {
                   System.err.println(key + "--->" + map.get(key));
               }
               // 定义 BufferedReader输入流来读取URL的响应
               BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
               String result = "";
               String line;
               while ((line = in.readLine()) != null) {
                   result += line;
               }
               /**
                * 返回结果示例
                */
               System.err.println("result:" + result);
               JSONObject jsonObject = new JSONObject(result);
               String access_token = jsonObject.getString("access_token");
               return access_token;
           } catch (Exception e) {
               System.err.printf("获取token失败！");
               e.printStackTrace(System.err);
           }
           return null;
       }
   
   }
   

4. 使用获取的token进行人脸识别。

   import java.util.HashMap;
   import java.util.Map;
   
   /**
    * 人脸检测与属性分析
    */
   public class FaceDetect {
   
       /**
        * 重要提示代码中所需工具类
        * FileUtil,Base64Util,HttpUtil,GsonUtils请从
        * https://ai.baidu.com/file/658A35ABAB2D404FBF903F64D47C1F72
        * https://ai.baidu.com/file/C8D81F3301E24D2892968F09AE1AD6E2
        * https://ai.baidu.com/file/544D677F5D4E4F17B4122FBD60DB82B3
        * https://ai.baidu.com/file/470B3ACCA3FE43788B5A963BF0B625F3
        * 下载
        */
       public static String detect() {
           // 请求url
           String url = "https://aip.baidubce.com/rest/2.0/face/v3/detect";
           try {
               Map<String, Object> map = new HashMap<>();
               byte[] bytes = FileUtil.readFileByBytes("d:/pic/11.jpg");
               String img = Base64Util.encode(bytes);
               map.put("image", img);
               map.put("face_field", "faceshape,facetype");
               map.put("image_type", "BASE64");
   
               String param = GsonUtils.toJson(map);
   
               // 注意这里仅为了简化编码每一次请求都去获取access_token，线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。
               String accessToken = "24.5005ca6593157e59e757fe8920cd5520.2592000.1548399012.282335-15274280";
   
               String result = HttpUtil.post(url, accessToken, "application/json", param);
               System.out.println(result);
               return result;
           } catch (Exception e) {
               e.printStackTrace();
           }
           return null;
       }
   
       public static void main(String[] args) {
           detect();
       }
   }
   

以下是需要用到的工具类
GsonUtils.java

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;

import java.lang.reflect.Type;
/**
 * Json工具类.
 */
public class GsonUtils {
    private static Gson gson = new GsonBuilder().create();

    public static String toJson(Object value) {
        return gson.toJson(value);
    }

    public static <T> T fromJson(String json, Class<T> classOfT) throws JsonParseException {
        return gson.fromJson(json, classOfT);
    }

    public static <T> T fromJson(String json, Type typeOfT) throws JsonParseException {
        return (T) gson.fromJson(json, typeOfT);
    }
}

加粗HttpUtil.java

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * http 工具类
 */
public class HttpUtil {

    public static String post(String requestUrl, String accessToken, String params)
            throws Exception {
        String contentType = "application/x-www-form-urlencoded";
        return HttpUtil.post(requestUrl, accessToken, contentType, params);
    }

    public static String post(String requestUrl, String accessToken, String contentType, String params)
            throws Exception {
        String encoding = "UTF-8";
        if (requestUrl.contains("nlp")) {
            encoding = "GBK";
        }
        return HttpUtil.post(requestUrl, accessToken, contentType, params, encoding);
    }

    public static String post(String requestUrl, String accessToken, String contentType, String params, String encoding)
            throws Exception {
        String url = requestUrl + "?access_token=" + accessToken;
        return HttpUtil.postGeneralUrl(url, contentType, params, encoding);
    }

    public static String postGeneralUrl(String generalUrl, String contentType, String params, String encoding)
            throws Exception {
        URL url = new URL(generalUrl);
        // 打开和URL之间的连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        // 设置通用的请求属性
        connection.setRequestProperty("Content-Type", contentType);
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setUseCaches(false);
        connection.setDoOutput(true);
        connection.setDoInput(true);

        // 得到请求的输出流对象
        DataOutputStream out = new DataOutputStream(connection.getOutputStream());
        out.write(params.getBytes(encoding));
        out.flush();
        out.close();

        // 建立实际的连接
        connection.connect();
        // 获取所有响应头字段
        Map<String, List<String>> headers = connection.getHeaderFields();
        // 遍历所有的响应头字段
        for (String key : headers.keySet()) {
            System.err.println(key + "--->" + headers.get(key));
        }
        // 定义 BufferedReader输入流来读取URL的响应
        BufferedReader in = null;
        in = new BufferedReader(
                new InputStreamReader(connection.getInputStream(), encoding));
        String result = "";
        String getLine;
        while ((getLine = in.readLine()) != null) {
            result += getLine;
        }
        in.close();
        System.err.println("result:" + result);
        return result;
    }
}

FileUtil.java

import java.io.*;

/**
 * 文件读取工具类
 */
public class FileUtil {

    /**
     * 读取文件内容，作为字符串返回
     */
    public static String readFileAsString(String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException(filePath);
        } 

        if (file.length() > 1024 * 1024 * 1024) {
            throw new IOException("File is too large");
        } 

        StringBuilder sb = new StringBuilder((int) (file.length()));
        // 创建字节输入流  
        FileInputStream fis = new FileInputStream(filePath);  
        // 创建一个长度为10240的Buffer
        byte[] bbuf = new byte[10240];  
        // 用于保存实际读取的字节数  
        int hasRead = 0;  
        while ( (hasRead = fis.read(bbuf)) > 0 ) {  
            sb.append(new String(bbuf, 0, hasRead));  
        }  
        fis.close();  
        return sb.toString();
    }

    /**
     * 根据文件路径读取byte[] 数组
     */
    public static byte[] readFileByBytes(String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException(filePath);
        } else {
            ByteArrayOutputStream bos = new ByteArrayOutputStream((int) file.length());
            BufferedInputStream in = null;

            try {
                in = new BufferedInputStream(new FileInputStream(file));
                short bufSize = 1024;
                byte[] buffer = new byte[bufSize];
                int len1;
                while (-1 != (len1 = in.read(buffer, 0, bufSize))) {
                    bos.write(buffer, 0, len1);
                }

                byte[] var7 = bos.toByteArray();
                return var7;
            } finally {
                try {
                    if (in != null) {
                        in.close();
                    }
                } catch (IOException var14) {
                    var14.printStackTrace();
                }

                bos.close();
            }
        }
    }
}

Base64Util.java

/**
 * Base64 工具类
 */
public class Base64Util {
    private static final char last2byte = (char) Integer.parseInt("00000011", 2);
    private static final char last4byte = (char) Integer.parseInt("00001111", 2);
    private static final char last6byte = (char) Integer.parseInt("00111111", 2);
    private static final char lead6byte = (char) Integer.parseInt("11111100", 2);
    private static final char lead4byte = (char) Integer.parseInt("11110000", 2);
    private static final char lead2byte = (char) Integer.parseInt("11000000", 2);
    private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};

    public Base64Util() {
    }

    public static String encode(byte[] from) {
        StringBuilder to = new StringBuilder((int) ((double) from.length * 1.34D) + 3);
        int num = 0;
        char currentByte = 0;

        int i;
        for (i = 0; i < from.length; ++i) {
            for (num %= 8; num < 8; num += 6) {
                switch (num) {
                    case 0:
                        currentByte = (char) (from[i] & lead6byte);
                        currentByte = (char) (currentByte >>> 2);
                    case 1:
                    case 3:
                    case 5:
                    default:
                        break;
                    case 2:
                        currentByte = (char) (from[i] & last6byte);
                        break;
                    case 4:
                        currentByte = (char) (from[i] & last4byte);
                        currentByte = (char) (currentByte << 2);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead2byte) >>> 6);
                        }
                        break;
                    case 6:
                        currentByte = (char) (from[i] & last2byte);
                        currentByte = (char) (currentByte << 4);
                        if (i + 1 < from.length) {
                            currentByte = (char) (currentByte | (from[i + 1] & lead4byte) >>> 4);

                        }
                        break;
                }

                to.append(encodeTable[currentByte]);
            }
        }

        if (to.length() % 4 != 0) {
            for (i = 4 - to.length() % 4; i > 0; --i) {
                to.append("=");
            }
        }

        return to.toString();
    }
}

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