行为验证码
拦机器人，不拦真实用户

import okhttp3.*;
import java.io.IOException;

public class CaptchaTest {
    public static void main(String[] args) throws IOException {
        // 创建请求客户端
        OkHttpClient client = new OkHttpClient();
        
        // 构建 multipart 表单参数
        RequestBody body = new MultipartBody.Builder()
            .setType(MultipartBody.FORM)
            .addFormDataPart("appId", "你的appId")
            .addFormDataPart("appKey", "你的appKey")
            .addFormDataPart("AppSecretKey", "验证码密钥")
            .addFormDataPart("CaptchaAppId", "验证码appId")
            .addFormDataPart("RendStr", "前端随机字符串")
            .addFormDataPart("Ticket", "验证码票据")
            .addFormDataPart("IP", "用户外网IP")
            .build();

        // 构建请求
        Request request = new Request.Builder()
            .url("https://api.253.com/open/txyzm/yzm-v2")
            .post(body)
            .build();

        // 执行请求
        try (Response response = client.newCall(request).execute()) {
            System.out.println(response.body().string());
        }
    }
}