如何使用 JAVA 将本地图像而不是 URL 发送到 Microsoft Cognitive Face API

Question

我正在尝试使用 Microsoft 认知服务的人脸 API。我想知道如何通过 REST API 调用向 Face API 发送本地图像，并使用 JAVA 请求结果。谁能帮我解决这个问题？

Microsoft 在其网站上提供的测试选项仅接受 URL，我尝试将本地路径转换为 ​​URL 并将其作为输入，但这不起作用。

Answer 1

一种选择是使用FileEntity 类。

// This sample uses the Apache HTTP client from HTTP Components (http://hc.apache.org/httpcomponents-client-ga/)
import java.io.File;
import java.net.URI;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.FileEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class Face
{
    public static void main(String[] args) 
    {
        HttpClient httpclient = HttpClients.createDefault();

        try
        {
            URIBuilder builder = new URIBuilder("https://api.projectoxford.ai/face/v1.0/detect");

            builder.setParameter("returnFaceId", "true");

            URI uri = builder.build();
            HttpPost request = new HttpPost(uri);
            request.setHeader("Ocp-Apim-Subscription-Key", "YOUR_KEY");


            // Request body
            File file = new File("YOUR_FILE");
            FileEntity reqEntity = new FileEntity(file, "application/octet-stream");
            request.setEntity(reqEntity);

            HttpResponse response = httpclient.execute(request);
            HttpEntity entity = response.getEntity();

            if (entity != null) 
            {
                System.out.println(EntityUtils.toString(entity));
            }
        }
        catch (Exception e)
        {
            System.out.println(e.getMessage());
        }
    }
}

Answer 2

使用 FileEntity 似乎是解决问题的最优雅的方法。 ctrash 的代码有一个小改动：由于构造函数FileEntity(File, String) 已弃用，因此必须使用构造函数FileEntity(File, ContentType)。在这种情况下，标头和图像文件的内容类型都必须是“application/octet-stream”。我让它与此代码一起使用：

// This sample uses the Apache HTTP client from HTTP Components (http://hc.apache.org/httpcomponents-client-ga/)
import java.io.File;
import java.net.URI;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.FileEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class PostTest
{
    public static void main(String[] args)
    {
        CloseableHttpClient httpclient = HttpClients.createDefault();

        try
        {
            URIBuilder uriBuilder = new URIBuilder("https://westus.api.cognitive.microsoft.com/face/v1.0/detect");

            uriBuilder.setParameter("returnFaceId", "true");
            uriBuilder.setParameter("returnFaceLandmarks", "false");
            uriBuilder.setParameter("returnFaceAttributes", "age");

            URI uri = uriBuilder.build();
            HttpPost request = new HttpPost(uri);

            // Request headers. Replace the example key below with your valid subscription key.
            request.setHeader("Content-Type", "application/octet-stream");
            request.setHeader("Ocp-Apim-Subscription-Key", "YOUR_SUBSCRIPTION_KEY");



            // Request body


            File file = new File("YOUR_IMAGE_FILE");

            FileEntity reqEntity = new FileEntity(file, ContentType.APPLICATION_OCTET_STREAM);
            request.setEntity(reqEntity);

            HttpResponse response = httpclient.execute(request);
            HttpEntity entity = response.getEntity();
            System.out.println(response.getStatusLine());

            if (entity != null)
            {
                System.out.println(EntityUtils.toString(entity));

            }
        }
        catch (Exception e)
        {
            System.out.println(e.getMessage());
        }
    }
}

正确执行后，终端会显示Face API返回的JSON对象。

谢谢你，cthrash，因为这是互联网上唯一让我学会如何做到这一点的地方！