这是我学习java调用百度api发布的第三篇博客，有关如何创建应用，快速入门获取token令牌请看我前两篇，谢谢
第一步新建一个普通的java项目即可
然后在项目中新建一个lib目录（需要引入5个jar包）
这里有4个
SDK下载_文字识别SDK_语音识别SDK-百度AI开放平台
还有一个gson的jar包在这里
https://mvnrepository.com/artifact/com.google.code.gson/gson/2.8.8
把他们解压完复制到lib目录，然后点击添加为库
可以打开扩展就是添加成功，然后建好项目结构，可以参考一下我的项目结构
然后让我们开始学代码吧！
AuthService类
package com.baidu.aip.aiFaceTest.getToken;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Calendar;
import java.util.List;
import java.util.Map;
import org.json.JSONObject;
public class AuthService {
private static Calendar expireDate = null;
private static boolean flag = false; // 是否已经获取过了
public static Boolean needAuth() {
Calendar c = Calendar.getInstance();
c.add(5, 1); // 当前日期加一天
return Boolean.valueOf(!flag || c.after(expireDate));
}
public static String getAuth() {
// 官网获取的 API Key 更新为你注册的
String clientId = "AN8QlNlAVyG2IFM86rXgloGD";
// 官网获取的 Secret Key 更新为你注册的
String clientSecret = "EgesHPy9csiT31HTp6QE2hCtTanVWlDc";
flag = true;
return getAuth(clientId, clientSecret);
}
private static String getAuth(String clientId, String clientSecret) {
// 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=" + clientId
// 3. 官网获取的 Secret Key
+ "&client_secret=" + clientSecret;
try {
URL realUrl = new URL(getAccessTokenUrl);
// 打开和URL之间的连接
HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
connection.setRequestMethod("POST");
connection.connect();
// 获取所有响应头字段
Map> 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;
}
System.err.println("result:" + result);
JSonObject jsonObject = new JSonObject(result);
String access_token = jsonObject.getString("access_token");
Integer expires_in = Integer.valueOf(jsonObject.getInt("expires_in"));
System.out.println("expires_in:" + expires_in);
Calendar c = Calendar.getInstance();
System.out.println("现在日期：" + c.get(c.YEAR) + "/" + c.get(c.MONTH) + "/" + c.get(c.DAY_OF_MONTH));
c.add(13, expires_in.intValue());
System.out.println("过期日期：" + c.get(c.YEAR) + "/" + c.get(c.MONTH) + "/" + c.get(c.DAY_OF_MONTH));
expireDate = c;
return access_token;
} catch (Exception e) {
System.err.printf("获取token失败！");
e.printStackTrace(System.err);
}
return null;
}
public static void main(String[] args) {
System.out.println("flag:" + flag);
System.out.println("needAuth():" + needAuth().booleanValue());
//第一次请求
if (needAuth().booleanValue()) {
String access_token = getAuth();
System.out.println("flag:" + flag);
System.out.println("access_token:" + access_token);
} else {
System.out.println("token未过期，不需要重新获取");
}
//第二次请求
if (needAuth().booleanValue()) {
String access_token = getAuth();
System.out.println("flag:" + flag);
System.out.println("access_token:" + access_token);
} else {
System.out.println("token未过期，不需要重新获取");
}
}
}
utils包的类，都是官网下载的，不想下载可以直接复制一下代码
base64Util
package com.baidu.aip.aiFaceTest.utils;
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);
}
}
to.append(encodeTable[currentByte]);
}
}
if (to.length() % 4 != 0) {
for (i = 4 - to.length() % 4; i > 0; --i) {
to.append("=");
}
}
return to.toString();
}
}
FileUtil
package com.baidu.aip.aiFaceTest.utils;
import java.io.*;
public class FileUtil {
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();
}
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();
}
}
}
}
GsonUtils
package com.baidu.aip.aiFaceTest.utils;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;
import java.lang.reflect.Type;
public class GsonUtils {
private static Gson gson = new GsonBuilder().create();
public static String toJson(Object value) {
return gson.toJson(value);
}
public static T fromJson(String json, Class classOfT) throws JsonParseException {
return gson.fromJson(json, classOfT);
}
public static T fromJson(String json, Type typeOfT) throws JsonParseException {
return (T) gson.fromJson(json, typeOfT);
}
}
HttpUtil
package com.baidu.aip.aiFaceTest.utils;
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;
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> 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.out.println("result:" + result);
return result;
}
}
最后编写我们的测试类
FaceDetect
package com.baidu.aip.aiFaceTest.test;
import com.baidu.aip.aiFaceTest.utils.base64Util;
import com.baidu.aip.aiFaceTest.utils.FileUtil;
import com.baidu.aip.aiFaceTest.utils.GsonUtils;
import com.baidu.aip.aiFaceTest.utils.HttpUtil;
import java.util.HashMap;
import java.util.Map;
public class FaceDetect {
public static String detect() {
// 请求url
String url = "https://aip.baidubce.com/rest/2.0/face/v3/detect";
try {
Map map = new HashMap<>();
// 获取绝对路径
byte[] bytes = FileUtil.readFileByBytes("E:\BaiduNetdiskDownload\java百度Ai\ai_java\ai_test_01\src\xpz.jpg");
String img = base64Util.encode(bytes);
map.put("image", img);
map.put("face_field", "faceshape,facetype");
map.put("image_type", "base64");
// 返回json值
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";
// 你的token值
String accessToken = "24.5064a9ce80b75a63e4fea912d43fd520.2592000.1636176301.282335-24949610";
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();
}
}
点击运行即可查看识别结果
ok！
我们的java调用百度api完成人脸识别就完成了.
附加资料https://ai.baidu.com/ai-doc/ANTIPORN/tk3h6xdji
