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Detailed analysis of the calling logic of Java and Huawei Cloud face comparison interface

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Release： 2023-07-07 19:04:40

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Detailed explanation of the calling logic and code examples of Java and Huawei Cloud face comparison interface

With the rapid development of artificial intelligence technology, face recognition has become a widely used technical means in modern society. Huawei Cloud provides a face comparison interface that can compare and recognize face images. This article will introduce in detail how to use the Java programming language to call the calling logic of the Huawei Cloud face comparison interface, and attach the corresponding code examples.

First, we need to create a face comparison service instance on Huawei Cloud and obtain the corresponding API Key and Secret Key for authentication permissions.

Next, we need to use Java programming language to implement the calling logic of the face comparison interface. First, we need to introduce the corresponding dependent libraries, including Apache HttpClient and Fastjson:

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.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import com.alibaba.fastjson.JSONObject;

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Next, we need to define a method to make an interface call for face comparison and pass in the two people to be compared. Base64 encoded string of the face image as parameter:

public static double compare(String image1, String image2) {
    double similarity = 0.0;
    try {
        // 根据实际的服务部署地区选择对应的API地址
        String apiUrl = "https://face.cn-north-1.myhuaweicloud.com/v2/compare-face";
        
        // 创建HttpPost对象，并设置请求的URL
        HttpPost httpPost = new HttpPost(apiUrl);
        
        // 设置请求的头部信息
        httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");
        httpPost.setHeader("X-Auth-Token", getAuthToken());
        
        // 设置请求的内容参数
        JSONObject requestObj = new JSONObject();
        requestObj.put("image1", image1);
        requestObj.put("image2", image2);
        
        StringEntity requestEntity = new StringEntity(requestObj.toJSONString(), ContentType.APPLICATION_JSON);
        httpPost.setEntity(requestEntity);

        // 创建HttpClient对象，并发送HttpPost请求
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpResponse response = httpClient.execute(httpPost);

        // 获取接口返回的结果
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity, "UTF-8");

        // 解析接口返回的结果
        JSONObject responseObj = JSONObject.parseObject(result);
        similarity = responseObj.getDouble("similarity");
    } catch (Exception e) {
        e.printStackTrace();
    }
    return similarity;
}

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In the above code, we first set the API address, request header information and request parameter information of the face comparison interface. Then, we use HttpClient to send an HttpPost request and get the results returned by the interface.

Finally, we also need to define a method to obtain the authentication token, which is used to obtain the token before the interface is called:

public static String getAuthToken() {
    String authToken = "";
    try {
        // 根据实际的服务部署地区选择对应的API地址
        String apiUrl = "https://iam.cn-north-1.myhuaweicloud.com/v3/auth/tokens";
        
        // 创建HttpPost对象，并设置请求的URL
        HttpPost httpPost = new HttpPost(apiUrl);
        
        // 设置请求的头部信息
        httpPost.setHeader("Content-Type", "application/json;charset=UTF-8");
        
        // 设置请求的内容参数
        String requestBody = "{"auth":{"identity":{"methods":["password"],"password":{"user":{"name":"<your_account_name>","password":"<your_password>","domain":{"name":"<your_domain_name>"}}}},"scope":{"project":{"name":"<your_project_name>"}}}}";
        StringEntity requestEntity = new StringEntity(requestBody, ContentType.APPLICATION_JSON);
        httpPost.setEntity(requestEntity);

        // 创建HttpClient对象，并发送HttpPost请求
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpResponse response = httpClient.execute(httpPost);

        // 获取接口返回的结果
        Header[] headers = response.getHeaders("X-Subject-Token");
        if (headers.length > 0) {
            authToken = headers[0].getValue();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return authToken;
}

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In the above code, we first set the API of the authentication interface Address, request header information and request parameter information. Then, we use HttpClient to send an HttpPost request and obtain the authentication Token in the result returned by the interface.

Finally, we can call the compare method in the main function to perform face comparison operations and output the results:

public static void main(String[] args) {
    String image1 = "<your_face_image1_base64_string>";
    String image2 = "<your_face_image2_base64_string>";

    double similarity = compare(image1, image2);
    System.out.println("相似度：" + similarity);
}

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In the above example code, we need to change , Replace , , with the actual Huawei Cloud account, password, domain name, and project name respectively, and replace , with the face to be compared, respectively. Base64 encoded string of the image.

In summary, this article analyzes the calling logic of Java and Huawei Cloud face comparison interfaces in detail, and provides corresponding code examples. I hope it will be helpful to readers in their practical application of face comparison.

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