Java音频转写踩坑实录之OpenAI语音接口超时与重复请求

export OPENAI_API_KEY='你的密钥'
javac Transcribe.java && java Transcribe meeting.mp3

import java.io.*;
import java.net.URI;
import java.net.http.*;
import java.nio.file.*;
import java.time.Duration;
public class Transcribe {
  static final String B = "----snail-ai-boundary";
  static void part(OutputStream out, String name, String value) throws IOException {
    out.write(("--" + B + "\r\nContent-Disposition: form-data; name=\"" + name + "\"\r\n\r\n" + value + "\r\n").getBytes());
  }
  static byte[] form(Path audio) throws IOException {
    if (Files.size(audio) > 20 * 1024 * 1024) throw new IllegalArgumentException("教学示例限制20MB");
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    part(out, "model", "gpt-4o-mini-transcribe");
    out.write(("--" + B + "\r\nContent-Disposition: form-data; name=\"file\"; filename=\"" + audio.getFileName() + "\"\r\nContent-Type: audio/mpeg\r\n\r\n").getBytes());
    out.write(Files.readAllBytes(audio));
    out.write(("\r\n--" + B + "--\r\n").getBytes());
    return out.toByteArray();
  }
  public static void main(String[] args) throws Exception {
    if (args.length != 1) throw new IllegalArgumentException("用法: 音频路径");
    String key = System.getenv("OPENAI_API_KEY");
    if (key == null || key.isBlank()) throw new IllegalStateException("缺少OPENAI_API_KEY");
    HttpRequest req = HttpRequest.newBuilder(URI.create("https://api.openai.com/v1/audio/transcriptions"))
        .timeout(Duration.ofSeconds(30))
        .header("Authorization", "Bearer " + key)
        .header("Content-Type", "multipart/form-data; boundary=" + B)
        .POST(HttpRequest.BodyPublishers.ofByteArray(form(Paths.get(args[0]))))
        .build();
    HttpResponse<String> res = HttpClient.newBuilder().connectTimeout(Duration.ofSeconds(5)).build()
        .send(req, HttpResponse.BodyHandlers.ofString());
    if (res.statusCode() / 100 != 2) throw new IOException("转写失败 HTTP=" + res.statusCode());
    System.out.println("转写成功；生产环境请将JSON交给解析器并脱敏保存。");
  }
}