Unity接入ChatGPT实现NPC聊天_unity中如何实现chatgpt聊天机器人

实现要求

1、能向OpenAI官网发送消息

        API官网：https://api.openai.com/v1/chat/completions

2、拥有自己的APIKey

实现步骤

1、明确发送消息的格式

            // 定义对话历史
            string conversation = "[{\"role\": \"system\", \"content\": \"You are a helpful assistant.\"}," +//确定是跟哪个对话窗口发送消息
                                  "{\"role\": \"user\", \"content\": \""+ message+"\"}]";//发送的消息
 
            // 构建请求体
            string requestBody = "{\"messages\": " + conversation + ", \"max_tokens\": 1024, " +//max_tokens 是收到消息的字节长度 一个token是四个字节 maxtoken越长收到的消息就越长
                                 "\"model\": \"gpt-3.5-turbo\"}";  // 设置使用的模型引擎按照你自己Key的模型这个是3.5的模型

2、明确收取消息的格式

{
  "id": "Key来源账户的ID",
  "object": "chat.completion",
  "created": 1691993667,
  "model": "gpt-3.5-turbo-0613",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "收到的消息类型"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 19,
    "completion_tokens": 18,
    "total_tokens": 37            //消息消耗的Token数量
  }
}

转化成对象类

public class ChatGPTJsonObjec
{
    public string id;
    public string @object;
    public string created;
    public string model;
    public Choices[] choices;
    public Usage usage;
}
[System.Serializable]
public class Choices
{
    public float index;
    public Message message;//消息放在这个类里下面有解释
    public string finish_reason;
}
[System.Serializable]
public class Message
{
    public string role;
    public string content;//收到的回复消息只要这个就行其他的都是一些用户信息没啥用
}
[System.Serializable]
public class Usage
{
    public int prompt_tokens;
    public int completion_tokens;
    public int total_tokens;//这条消息消耗的Token 一个token等于四个字节
}

实现脚本

using System.Collections;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using System.Text;
/// <summary>
/// 脚本功能:ChatGTP发送消息
/// </summary>
	public class BebornMemoryChatGPT : MonoBehaviour
	{
        //去API官网弄，有小白弄不来的私信我我告诉你哪里有
		public string apiKey = "key";
		private string apiUrl = "https://api.openai.com/v1/chat/completions";
        public Button button;
        public InputField inputField;
        private void Awake()
        {
            SendMessageToChatGPT("你好");//发送你好，里面的内容是啥都行
        }
        public void ToJson()
        {
            ChatGPTJsonObjec chatGPTJsonObjec = new ChatGPTJsonObjec();
            string json = JsonUtility.ToJson(chatGPTJsonObjec, true);
            Debug.Log(json);
        }
        /// <summary>
        /// 携程收发消息
        /// </summary>
        /// <param name="message">发送的消息</param>
 
        private void SendMessageToChatGPT(string message)
        {
            // 定义对话历史
            string conversation = "[{\"role\": \"system\", \"content\": \"You are a helpful assistant.\"}," +//确定是跟哪个对话窗口发送消息
                                  "{\"role\": \"user\", \"content\": \""+ message+"\"}]";//发送的消息
 
            // 构建请求体
            string requestBody = "{\"messages\": " + conversation + ", \"max_tokens\": 1024, " +//max_tokens 是收到消息的字节长度 一个token是四个字节 maxtoken越长收到的消息就越长
                                 "\"model\": \"gpt-3.5-turbo\"}";  // 设置使用的模型引擎
 
            StartCoroutine(AsyncSendMessageToChatGPT(requestBody));
            Debug.Log("发送："+ message);
        }
 
		private IEnumerator AsyncSendMessageToChatGPT(string message)
        {
            byte[] data = Encoding.UTF8.GetBytes(message);
            using(UnityWebRequest www = new UnityWebRequest(apiUrl, "POST"))
            {
                www.uploadHandler = new UploadHandlerRaw(data);//设置上传的数据是字符数组
                www.downloadHandler = new DownloadHandlerBuffer();
                www.SetRequestHeader("Content-Type", "application/json");
                www.SetRequestHeader("Authorization", "Bearer " + apiKey);
 
                yield return www.SendWebRequest();
                if (www.result != UnityWebRequest.Result.Success)
                {
                    Debug.LogError("Protocol Error: " + www.error);
                    Debug.LogError("Error Response: " + www.downloadHandler.text);
                    Debug.LogError("发送的消息失败，请重新创建链接，需要全局科学上网哦"+ www.result);
                }
                else
                {
                    string receive = www.downloadHandler.text;
                    Debug.Log(receive);//输出收到的所有Json信息
                    ChatGPTJsonObjec chatGPTJsonObjec = JsonUtility.FromJson<ChatGPTJsonObjec>(receive);
                    //chatGPTJsonObjec.choices[0].message.content  这个就是你收到的回复
                    Debug.Log("收到的回复："+chatGPTJsonObjec.choices[0].message.content);
                }
            }
            
        }
 
    }
#region JsonData
public class ChatGPTJsonObjec
{
    public string id;
    public string @object;
    public string created;
    public string model;
    public Choices[] choices;
    public Usage usage;
}
[System.Serializable]
public class Choices
{
    public float index;
    public Message message;
    public string finish_reason;
}
[System.Serializable]
public class Message
{
    public string role;
    public string content;
}
[System.Serializable]
public class Usage
{
    public int prompt_tokens;
    public int completion_tokens;
    public int total_tokens;
}
#endregion

实现效果

小结

能一本正经地回答一些呆瓜问题，挺好玩的，聊得越多越了解你，经过一定训练能当游戏的NPC。