从 Spring Boot 调用 CAPTCHA API

// Java 21+, Spring Web 7.0.10 and Gson 2.15.0; use your Boot dependency management.
// Save as CaptchaClient.java in your application's package.
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.net.http.HttpClient;
import java.time.Duration;
import org.springframework.http.MediaType;
import org.springframework.http.client.JdkClientHttpRequestFactory;
import org.springframework.web.client.RestClient;

public final class CaptchaClient {
    private final RestClient api;
    public CaptchaClient(String key) {
        var transport = HttpClient.newBuilder().connectTimeout(Duration.ofSeconds(10))
            .followRedirects(HttpClient.Redirect.NEVER).build();
        var factory = new JdkClientHttpRequestFactory(transport);
        factory.setReadTimeout(Duration.ofSeconds(25));
        api = RestClient.builder().baseUrl("https://api.solvethree.com/v1")
            .requestFactory(factory).defaultHeader("Authorization", "Bearer " + key).build();
    }
    public JsonObject create(String site, String proxy, String requestId) {
        var input = new JsonObject();
        input.addProperty("site", site);
        input.addProperty("action", "login");
        input.addProperty("proxy", proxy);
        input.addProperty("requestId", requestId); // Save before calling create.
        String body = api.post().uri("/tasks?waitMs=0").contentType(MediaType.APPLICATION_JSON)
            .body(input.toString()).retrieve().body(String.class);
        return JsonParser.parseString(body).getAsJsonObject();
    }
    public JsonObject get(String id) {
        if (!id.matches("[A-Za-z0-9_-]+")) throw new IllegalArgumentException("Invalid task ID");
        String body = api.get().uri("/tasks/{id}?waitMs=15000", id)
            .retrieve().body(String.class);
        return JsonParser.parseString(body).getAsJsonObject();
    }
}
// Construct once with System.getenv("SOLVETHREE_API_KEY") in a server-side @Bean.
// Call create once, save its id, then get(id) until ready/failed or your deadline.
// RestClient throws on HTTP errors; keep the saved requestId and any known task id.