安卓开发利⽤百度识图api进⾏物体识别（java版）
之前的随笔中，已经实现了调⽤api接⼝，之所以使⽤python是因为python⽐java要简洁。
chaquopy对开源软件是免费的，闭源是收费的，因此正常使⽤就需要我们发送Email去申请⼀个license，有点⿇烦。因此接下来再写⼀个java版的，⾸先写⼏个⼯具类：1.获取token
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.HttpURLConnection;
import java.URL;
import java.util.List;
import java.util.Map;
/**
* 获取token类
*/
public class AuthService {
/**
* 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 = "你的API Key";
// 官⽹获取的 Secret Key 更新为你注册的
String clientSecret = "你的Secret Key";
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python转java代码
String authHost = "aip.baidubce/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");
// 获取所有响应头字段
Map<String, List<String>> map = HeaderFields();
/
/ 遍历所有的响应头字段
for (String key : map.keySet()) {
}
// 定义 BufferedReader输⼊流来读取URL的响应
BufferedReader in = new BufferedReader(new InputStream()));
String result = "";
String line;
while ((line = in.readLine()) != null) {
result += line;
}
/
**
* 返回结果⽰例
*/
JSONObject jsonObject = new JSONObject(result);
String access_token = String("access_token");
return access_token;
} catch (Exception e) {
e.);
}
return null;
}
}
2.Base64
/**
* 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);
}
}
to.append(encodeTable[currentByte]);
}
}
if (to.length() % 4 != 0) {
for (i = 4 - to.length() % 4; i > 0; --i) {
to.append("=");
}
}
String();
}
}
3.FileUtil⽂件读取⼯具类
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 (!ists()) {
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 = ad(bbuf)) > 0 ) {
sb.append(new String(bbuf, 0, hasRead));
}
fis.close();
String();
}
/**
* 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 (!ists()) {
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 = ByteArray();
return var7;
} finally {
try {
if (in != null) {
in.close();
}
} catch (IOException var14) {
var14.printStackTrace();
}
bos.close();
}
}
}
}
4.Http⼯具类
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.HttpURLConnection;
import java.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 (ains("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 OutputStream());
out.Bytes(encoding));
out.flush();
out.close();
// 建⽴实际的连接
// 获取所有响应头字段
Map<String, List<String>> headers = HeaderFields();
// 遍历所有的响应头字段
for (String key : headers.keySet()) {
}
// 定义 BufferedReader输⼊流来读取URL的响应
BufferedReader in = null;
in = new BufferedReader(
new InputStream(), encoding));
String result = "";
String getLine;
while ((getLine = in.readLine()) != null) {
result += getLine;
}
in.close();
return result;
}
}
5.开始识图
import utils.AuthService;
import utils.Base64Util;
import utils.FileUtil;
import utils.HttpUtil;
//import utils.GsonUtils;
import net.sf.json.JSONArray;
import java.URLEncoder;
/**
* 通⽤物体和场景识别
*/
public class AdvancedGeneral {
/**
* 重要提⽰代码中所需⼯具类
* FileUtil,Base64Util,HttpUtil,GsonUtils请从
* ai.baidu/file/658A35ABAB2D404FBF903F64D47C1F72
* ai.baidu/file/C8D81F3301E24D2892968F09AE1AD6E2
* ai.baidu/file/544D677F5D4E4F17B4122FBD60DB82B3
* ai.baidu/file/470B3ACCA3FE43788B5A963BF0B625F3
* 下载
*/
public static String advancedGeneral() {
int index = 0;
int rIndex = 0;
int lastLeft = 0;
// 请求url
String url = "aip.baidubce/rest/2.0/image-classify/v2/advanced_general";
try {
// 本地⽂件路径
String filePath = "E:\\Microsoft Edge Download\\菜品1.jpg";//⽂件路径
byte[] imgData = adFileByBytes(filePath);
String imgStr = de(imgData);
String imgParam = de(imgStr, "UTF-8");
String param = "image=" + imgParam;
// 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 = Auth();;
String result = HttpUtil.post(url, accessToken, param);
System.out.println(result);
//保留想要的结果

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