阿里云图像识别Java调用示例参考
简介: 本文给出使用Java语言分别使用网络图片和本地图片调用场景识别API的示例。
概述
图像识别服务(Image Recognition)基于大数据和深度学习实现,可精准识别图像中的视觉内容,包括上千种物体标签、数十种常见场景等,包含场景分类、图像打标、鉴黄等在线API服务模块,应用于智能相册管理、图片分类和检索、图片安全监控等场景。下面给出使用Java语言分别使用网络图片和本地图片调用场景识别API的示例。
控制台测试
与人脸识别类似,可以参考:阿里云人脸识别使用流程简介 。
Java Code Sample
使用网络图片测试
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 ComputerDemo1 {/*
• 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
String ak_id = “"; //用户ak
String ak_secret = "”; // 用户ak_secret
String url = “https://dtplus-cn-shanghai.data.aliyuncs.com/image/scene”;
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:”}
}使用本地图片测试
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;
public class ComputerDemo2 {/*
• 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
String ak_id = “"; //用户ak
String ak_secret = "”; // 用户ak_secret
String url = “https://dtplus-cn-shanghai.data.aliyuncs.com/image/scene”;
//上传本地图片
// Request body
String pic_path = “C:\Users\taro.yt\Desktop\timg.jpg”;
File picBase64 = new File(pic_path);
String
//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
}
}测试结果
response body:{“tags”:[{“value”:“人物”,“confidence”:97.0},{“value”:“演出”,“confidence”:12.0},{“value”:“其他”,“confidence”:12.0},{“value”:“室内”,“confidence”:11.0}],“errno”:0,“request_id”:“b31aebed-305a-4377-a843-ac4e9d3d30c1”}
参考链接
场景识别API调用说明