概述
目前阿里云提供了关于人脸识别的调用接口，提供的接口包括人脸检测定位、人脸属性识别及人脸对比三个API，用户可以基于[Rest API]的调用说明完成调用操作。下面给出使用Java语言分别使用网络图片和本地图片调用人脸属性API的示例。
准备工作
1、拥有阿里云账号并开通了人脸识别服务，具体参考官方[链接]；
2、获取阿里云账户的AccessKey ID和Access Key Secret；
3、获取服务调用的地址，如果不清楚，可以直接到人脸识别API调试部分获取，也可以使用其完成快速测试。
Java Code Sample
使用网络图片Code
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
//@SuppressWarnings("restriction")
public class FaceDemo1 {
/*
* 计算MD5+BASE64
*/
public static String MD5Base64(String s) {
if (s == null)
return null;
String encodeStr = "";
byte[] utfBytes = s.getBytes();
MessageDigest mdTemp;
try {
mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(utfBytes);
byte[] md5Bytes = mdTemp.digest();
BASE64Encoder b64Encoder = new BASE64Encoder();
encodeStr = b64Encoder.encode(md5Bytes);
} catch (Exception e) {
throw new Error("Failed to generate MD5 : " + e.getMessage());
}
return encodeStr;
}
/*
* 计算 HMAC-SHA1
*/
public static String HMACSha1(String data, String key) {
String result;
try {
SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(data.getBytes());
result = (new BASE64Encoder()).encode(rawHmac);
} catch (Exception e) {
throw new Error("Failed to generate HMAC : " + e.getMessage());
}
return result;
}
/*
* 等同于javaScript中的 new Date().toUTCString();
*/
public static String toGMTString(Date date) {
SimpleDateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.UK);
df.setTimeZone(new java.util.SimpleTimeZone(0, "GMT"));
return df.format(date);
}
/*
* 发送POST请求
*/
public static String sendPost(String url, String body, String ak_id, String ak_secret) throws Exception {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
int statusCode = 200;
try {
URL realUrl = new URL(url);
/*
* http header 参数
*/
String method = "POST";
String accept = "application/json";
String content_type = "application/json";
String path = realUrl.getFile();
String date = toGMTString(new Date());
// 1.对body做MD5+BASE64加密
String bodyMd5 = MD5Base64(body);
String stringToSign = method + "\n" + accept + "\n" + bodyMd5 + "\n" + content_type + "\n" + date + "\n"
+ path;
// 2.计算 HMAC-SHA1
String signature = HMACSha1(stringToSign, ak_secret);
// 3.得到 authorization header
String authHeader = "Dataplus " + ak_id + ":" + signature;
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", accept);
conn.setRequestProperty("content-type", content_type);
conn.setRequestProperty("date", date);
conn.setRequestProperty("Authorization", authHeader);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(body);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
statusCode = ((HttpURLConnection)conn).getResponseCode();
if(statusCode != 200) {
in = new BufferedReader(new InputStreamReader(((HttpURLConnection)conn).getErrorStream()));
} else {
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
}
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
if (statusCode != 200) {
throw new IOException("\nHttp StatusCode: "+ statusCode + "\nErrorMessage: " + result);
}
return result;
}
/*
* GET请求
*/
public static String sendGet(String url, String ak_id, String ak_secret) throws Exception {
String result = "";
BufferedReader in = null;
int statusCode = 200;
try {
URL realUrl = new URL(url);
/*
* http header 参数
*/
String method = "GET";
String accept = "application/json";
String content_type = "application/json";
String path = realUrl.getFile();
String date = toGMTString(new Date());
// 1.对body做MD5+BASE64加密
// String bodyMd5 = MD5Base64(body);
String stringToSign = method + "\n" + accept + "\n" + "" + "\n" + content_type + "\n" + date + "\n" + path;
// 2.计算 HMAC-SHA1
String signature = HMACSha1(stringToSign, ak_secret);
// 3.得到 authorization header
String authHeader = "Dataplus " + ak_id + ":" + signature;
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", accept);
connection.setRequestProperty("content-type", content_type);
connection.setRequestProperty("date", date);
connection.setRequestProperty("Authorization", authHeader);
connection.setRequestProperty("Connection", "keep-alive");
// 建立实际的连接
connection.connect();
// 定义 BufferedReader输入流来读取URL的响应
statusCode = ((HttpURLConnection)connection).getResponseCode();
if(statusCode != 200) {
in = new BufferedReader(new InputStreamReader(((HttpURLConnection)connection).getErrorStream()));
} else {
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
}
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
if (statusCode != 200) {
throw new IOException("\nHttp StatusCode: "+ statusCode + "\nErrorMessage: " + result);
}
return result;
}
public static void main(String[] args) throws Exception {
// 发送POST请求示例
System.out.println(i);
String ak_id = "******"; //用户ak
String ak_secret = "******"; // 用户ak_secret
String url = "https://dtplus-cn-shanghai.data.aliyuncs.com/face/attribute";
String body = "{\"type\": \"0\", \"image_url\":\"https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1544608444&di=54513735567736d0eaeba7a13aa0421c&src=http://img5q.duitang.com/uploads/item/201411/23/20141123205812_Bircn.jpeg\"}";
System.out.println("response body:" + sendPost(url, body, ak_id, ak_secret));
}
}
使用本地图片Code
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
//@SuppressWarnings("restriction")
public class FaceDemo2 {
/*
* 计算MD5+BASE64
*/
public static String MD5Base64(String s) {
if (s == null)
return null;
String encodeStr = "";
byte[] utfBytes = s.getBytes();
MessageDigest mdTemp;
try {
mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(utfBytes);
byte[] md5Bytes = mdTemp.digest();
BASE64Encoder b64Encoder = new BASE64Encoder();
encodeStr = b64Encoder.encode(md5Bytes);
} catch (Exception e) {
throw new Error("Failed to generate MD5 : " + e.getMessage());
}
return encodeStr;
}
/*
* 计算 HMAC-SHA1
*/
public static String HMACSha1(String data, String key) {
String result;
try {
SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(data.getBytes());
result = (new BASE64Encoder()).encode(rawHmac);
} catch (Exception e) {
throw new Error("Failed to generate HMAC : " + e.getMessage());
}
return result;
}
/*
* 等同于javaScript中的 new Date().toUTCString();
*/
public static String toGMTString(Date date) {
SimpleDateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.UK);
df.setTimeZone(new java.util.SimpleTimeZone(0, "GMT"));
return df.format(date);
}
/*
* 发送POST请求
*/
public static String sendPost(String url, String body, String ak_id, String ak_secret) throws Exception {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
int statusCode = 200;
try {
URL realUrl = new URL(url);
/*
* http header 参数
*/
String method = "POST";
String accept = "application/json";
String content_type = "application/json";
// String content_type = "application/octet-stream";
String path = realUrl.getFile();
String date = toGMTString(new Date());
// 1.对body做MD5+BASE64加密
String bodyMd5 = MD5Base64(body);
String stringToSign = method + "\n" + accept + "\n" + bodyMd5 + "\n" + content_type + "\n" + date + "\n"
+ path;
// 2.计算 HMAC-SHA1
String signature = HMACSha1(stringToSign, ak_secret);
// 3.得到 authorization header
String authHeader = "Dataplus " + ak_id + ":" + signature;
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", accept);
conn.setRequestProperty("content-type", content_type);
conn.setRequestProperty("date", date);
conn.setRequestProperty("Authorization", authHeader);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(body);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
statusCode = ((HttpURLConnection)conn).getResponseCode();
if(statusCode != 200) {
in = new BufferedReader(new InputStreamReader(((HttpURLConnection)conn).getErrorStream()));
} else {
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
}
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
if (statusCode != 200) {
throw new IOException("\nHttp StatusCode: "+ statusCode + "\nErrorMessage: " + result);
}
return result;
}
/*
* GET请求
*/
public static String sendGet(String url, String ak_id, String ak_secret) throws Exception {
String result = "";
BufferedReader in = null;
int statusCode = 200;
try {
URL realUrl = new URL(url);
/*
* http header 参数
*/
String method = "GET";
String accept = "application/json";
String content_type = "application/json";
// String content_type = "application/octet-stream";
String path = realUrl.getFile();
String date = toGMTString(new Date());
// 1.对body做MD5+BASE64加密
// String bodyMd5 = MD5Base64(body);
String stringToSign = method + "\n" + accept + "\n" + "" + "\n" + content_type + "\n" + date + "\n" + path;
// 2.计算 HMAC-SHA1
String signature = HMACSha1(stringToSign, ak_secret);
// 3.得到 authorization header
String authHeader = "Dataplus " + ak_id + ":" + signature;
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", accept);
connection.setRequestProperty("content-type", content_type);
connection.setRequestProperty("date", date);
connection.setRequestProperty("Authorization", authHeader);
connection.setRequestProperty("Connection", "keep-alive");
// 建立实际的连接
connection.connect();
// 定义 BufferedReader输入流来读取URL的响应
statusCode = ((HttpURLConnection)connection).getResponseCode();
if(statusCode != 200) {
in = new BufferedReader(new InputStreamReader(((HttpURLConnection)connection).getErrorStream()));
} else {
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
}
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
if (statusCode != 200) {
throw new IOException("\nHttp StatusCode: "+ statusCode + "\nErrorMessage: " + result);
}
return result;
}
public static void main(String[] args) throws Exception {
// 发送POST请求示例
String ak_id = "******"; //用户ak
String ak_secret = "******"; // 用户ak_secret
String url = "https://dtplus-cn-shanghai.data.aliyuncs.com/face/attribute";
//上传本地图片
// Request body
String pic_path = "C:\\Users\\****\\Desktop\\timg.jpg";//本地图片的路径
File picBase64 = new File(pic_path);
String pic = encodeImageToBase64(picBase64);
//提出base64编码的换行符问题
String data = pic.replaceAll("[\\s*\t\n\r]", "");
data = "'" + data + "'";
String body = "{\"type\": "+1+", \"content\": "+data+"}";
System.out.println("response body:" + sendPost(url, body, ak_id, ak_secret));
}
/**
* 将本地图片编码为base64
*
* @param file
* @return
* @throws Exception
*/
public static String encodeImageToBase64(File file) throws Exception {
//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
// loggerger.info("图片的路径为:" + file.getAbsolutePath());
InputStream in = null;
byte[] data = null;
//读取图片字节数组
try {
in = new FileInputStream(file);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
e.printStackTrace();
throw new Exception("图片上传失败,请联系客服!");
}
//对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
String base64 = encoder.encode(data);
return base64;//返回Base64编码过的字节数组字符串
}
}
人脸比对示例使用本地图片Code
import sun.misc.BASE64Encoder;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
//@SuppressWarnings("restriction")
public class FaceDemoVerify {
/*
* 计算MD5+BASE64
*/
public static String MD5Base64(String s) {
if (s == null)
return null;
String encodeStr = "";
byte[] utfBytes = s.getBytes();
MessageDigest mdTemp;
try {
mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(utfBytes);
byte[] md5Bytes = mdTemp.digest();
BASE64Encoder b64Encoder = new BASE64Encoder();
encodeStr = b64Encoder.encode(md5Bytes);
} catch (Exception e) {
throw new Error("Failed to generate MD5 : " + e.getMessage());
}
return encodeStr;
}
/*
* 计算 HMAC-SHA1
*/
public static String HMACSha1(String data, String key) {
String result;
try {
SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
Mac mac = Mac.getInstance("HmacSHA1");
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(data.getBytes());
result = (new BASE64Encoder()).encode(rawHmac);
} catch (Exception e) {
throw new Error("Failed to generate HMAC : " + e.getMessage());
}
return result;
}
/*
* 等同于javaScript中的 new Date().toUTCString();
*/
public static String toGMTString(Date date) {
SimpleDateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.UK);
df.setTimeZone(new java.util.SimpleTimeZone(0, "GMT"));
return df.format(date);
}
/*
* 发送POST请求
*/
public static String sendPost(String url, String body, String ak_id, String ak_secret) throws Exception {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
int statusCode = 200;
try {
URL realUrl = new URL(url);
/*
* http header 参数
*/
String method = "POST";
String accept = "application/json";
String content_type = "application/json";
// String content_type = "application/octet-stream";
String path = realUrl.getFile();
String date = toGMTString(new Date());
// 1.对body做MD5+BASE64加密
String bodyMd5 = MD5Base64(body);
String stringToSign = method + "\n" + accept + "\n" + bodyMd5 + "\n" + content_type + "\n" + date + "\n"
+ path;
// 2.计算 HMAC-SHA1
String signature = HMACSha1(stringToSign, ak_secret);
// 3.得到 authorization header
String authHeader = "Dataplus " + ak_id + ":" + signature;
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", accept);
conn.setRequestProperty("content-type", content_type);
conn.setRequestProperty("date", date);
conn.setRequestProperty("Authorization", authHeader);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(body);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
statusCode = ((HttpURLConnection)conn).getResponseCode();
if(statusCode != 200) {
in = new BufferedReader(new InputStreamReader(((HttpURLConnection)conn).getErrorStream()));
} else {
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
}
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
if (statusCode != 200) {
throw new IOException("\nHttp StatusCode: "+ statusCode + "\nErrorMessage: " + result);
}
return result;
}
/*
* GET请求
*/
public static String sendGet(String url, String ak_id, String ak_secret) throws Exception {
String result = "";
BufferedReader in = null;
int statusCode = 200;
try {
URL realUrl = new URL(url);
/*
* http header 参数
*/
String method = "GET";
String accept = "application/json";
String content_type = "application/json";
// String content_type = "application/octet-stream";
String path = realUrl.getFile();
String date = toGMTString(new Date());
// 1.对body做MD5+BASE64加密
// String bodyMd5 = MD5Base64(body);
String stringToSign = method + "\n" + accept + "\n" + "" + "\n" + content_type + "\n" + date + "\n" + path;
// 2.计算 HMAC-SHA1
String signature = HMACSha1(stringToSign, ak_secret);
// 3.得到 authorization header
String authHeader = "Dataplus " + ak_id + ":" + signature;
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", accept);
connection.setRequestProperty("content-type", content_type);
connection.setRequestProperty("date", date);
connection.setRequestProperty("Authorization", authHeader);
connection.setRequestProperty("Connection", "keep-alive");
// 建立实际的连接
connection.connect();
// 定义 BufferedReader输入流来读取URL的响应
statusCode = ((HttpURLConnection)connection).getResponseCode();
if(statusCode != 200) {
in = new BufferedReader(new InputStreamReader(((HttpURLConnection)connection).getErrorStream()));
} else {
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
}
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
if (statusCode != 200) {
throw new IOException("\nHttp StatusCode: "+ statusCode + "\nErrorMessage: " + result);
}
return result;
}
public static void main(String[] args) throws Exception {
// 发送POST请求示例
String ak_id = "********"; //用户ak
String ak_secret = "********"; // 用户ak_secret
String url = "https://dtplus-cn-shanghai.data.aliyuncs.com/face/verify";
//上传本地图片
// Request body
String pic_path = "D:\\picturetest\\timg.jpg";//本地图片的路径
File picBase64 = new File(pic_path);
String pic = encodeImageToBase64(picBase64);
//提出base64编码的换行符问题
String data = pic.replaceAll("[\\s*\t\n\r]", "");
data = "'" + data + "'";
String body = "{\"type\":1,\n" +
"\"content_1\":"+data+",\n" +
"\"content_2\":"+data+"\n" +
"}";
System.out.println("response body:" + sendPost(url, body, ak_id, ak_secret));
}
/**
* 将本地图片编码为base64
*
* @param file
* @return
* @throws Exception
*/
public static String encodeImageToBase64(File file) throws Exception {
//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
// loggerger.info("图片的路径为:" + file.getAbsolutePath());
InputStream in = null;
byte[] data = null;
//读取图片字节数组
try {
in = new FileInputStream(file);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
e.printStackTrace();
throw new Exception("图片上传失败,请联系客服!");
}
//对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
String base64 = encoder.encode(data);
return base64;//返回Base64编码过的字节数组字符串
}
}
注意事项
关于调用本地图片的问题，特别需要注意关于base64编码默认添加了换行符的问题，需要剔除，请求body的具体格式也需要注意，具体参考示例代码。
参考链接
[API校验规范]
[人脸识别错误码]
