写一个用java调用chatgptapi的代码

非常感谢您的提问，以下是一个使用Java调用ChatGPT API的示例代码：

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

public class ChatGPTAPI {

    public static void main(String[] args) throws IOException {
        String url = "https://api.chatgpt.com/chat";
        String apiKey = "YOUR_API_KEY";
        String prompt = "Hello, how are you?";
        String payload = "{\"prompt\": \"" + prompt + "\"}";

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("Content-Type", "application/json");
        con.setRequestProperty("Authorization", "Bearer " + apiKey);
        con.setDoOutput(true);

        OutputStreamWriter wr = new OutputStreamWriter(con.getOutputStream());
        wr.write(payload);
        wr.flush();

        int responseCode = con.getResponseCode();
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        System.out.println(response.toString());
    }
}

请注意，您需要将 `YOUR_API_KEY` 替换为您自己的 ChatGPT API 密钥。此外，您还需要确保您的 Java 环境已正确配置，以便能够进行网络请求。