//pom.xml
<dependencies>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>${version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpcore</artifactId>
        <version>${version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpmime</artifactId>
        <version>${version}</version>
    </dependency>
</dependencies>

//java
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import java.io.File;
import java.io.IOException;
import java.util.Base64;
@RestController
public class ApiTest {
 
    @PostMapping("/api_test")
    public void testTest() {
        String clientId = "${client_id}";
        String apiKey = "${api_key}";
        String filepath = "${file_path}";
        String requestURI = "https://pado.rippleai.co/api/pado/speech/upload";
 
        HttpClient client = HttpClientBuilder.create().build();
        HttpPost request = new HttpPost(requestURI);
 
        String beforeEncoding = clientId + ":" + apiKey;
        String authorization = "basic " + Base64.getEncoder()
                                              .encodeToString(beforeEncoding.getBytes());
        request.addHeader("Authorization", authorization);
 
        MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
        multipartEntityBuilder
        .setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
 
        File file = new File(filepath);
        FileBody body = new FileBody(file);
        multipartEntityBuilder.addPart("media", body);
        request.setEntity(multipartEntityBuilder.build());
        try {
            HttpResponse response = client.execute(request);
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String body2 = responseHandler.handleResponse(response);
            System.out.println("**************************************");
            System.out.println(body2);
        } catch (IOException e) {
            System.out.println("api 통신 불가\ne.getMessage() = " + e.getMessage());
        }
    }
}