stream: true 的方式应该怎么写？

要使用 OpenAI API 的 stream 模式，您需要对代码进行一些修改。以下是使用 Java 进行 stream 请求的示例代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class OpenAIJavaStreamExample {
    public static void main(String[] args) {
        try {
            String apiKey = "YOUR_API_KEY";
            String prompt = "Hello, world!";
            String model = "gpt-3.5-turbo";

            OpenAIJavaStreamExample.sendRequest(apiKey, prompt, model);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void sendRequest(String apiKey, String prompt, String model) throws IOException {
        String url = "https://api.openai.com/v1/engines/" + model + "/completions";
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        // Set the request method and headers
        con.setRequestMethod("POST");
        con.setRequestProperty("Content-Type", "application/json");
        con.setRequestProperty("Authorization", "Bearer " + apiKey);

        // Build the JSON request body
        String requestBody = "{\"prompt\": \"" + prompt + "\", \"stream\": true}";
        con.setDoOutput(true);
        try (OutputStream os = con.getOutputStream()) {
            byte[] input = requestBody.getBytes("utf-8");
            os.write(input, 0, input.length);
        }

        // Send the request and get the response
        int responseCode = con.getResponseCode();
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println("Response: " + inputLine);
        }
        in.close();
    }
}

请注意，与之前的代码相比，我们在请求体中添加了 `"stream": true`。在 `while` 循环中，我们逐行读取响应并打印出来。

记得将 `YOUR_API_KEY` 替换为您自己的 API 密钥。