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ChatGPT API Ajax連携

Posted at

今日までの進捗まとめ

■HTML

ブラウザはシンプル
スクリーンショット 2023-03-03 12.12.34.png

ポイント id名
送信ボタン send-button
<!DOCTYPE html>
<html lang="ja" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>OpenAI Chat Bot</title>
</head>
<body>
	<input type="text" id="input-field">
	<button id="send-button">送信</button> //■ポイント: ここです!!!!!!!!
  
  
 	<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
	<script th:src="@{/js/start.js}"></script>
</body>
</html>

■JavaScript

ポイント

1 送信ボタン(id="send-button")を押す
 →sendRequestメソッドが動く
2 sendRequestメソッドの中でAjaxが動く
 →Javaに繋がる

$(function(){
	$('#send-button').on('click', function() {
		const message = $('#input-field').val();
		sendRequest(message);
	});//■ onの終わり
});//■ 1番上のready関数の最後

//OpenAI APIにリクエストを送信する関数
function sendRequest(message) {
    $.ajax({
    	url: "/openAiChat",
    	type: "POST",
    	contentType: "application/json",
        data: JSON.stringify({
        	message: message
        })
    }).done(function(response, textStatus, jqXHR) {
    	console.log(response);
    }).fail(function(jqXHR, textStatus, errorThrown) {
    	console.log("きてない");
    });
}

■Java

なんでJavaいるの?

セキュリティの観点から
Java側で環境変数内のAPIキーを取得

ポイント

ここでChatGPTのAPIとやりとりをする

package com.example.controller;

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

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;

@Controller
@RequestMapping("")
public class TestChatAjaxController {

	@RequestMapping("")
	public String toStart() {
        return "start";
	}
	
    @PostMapping("/openAiChat")
    public ResponseEntity<String> openAiChat(@RequestBody String preMessage) {
    	String url = "https://api.openai.com/v1/chat/completions";
    	String api_key = System.getenv("OPENAI_API_KEY");
    	String model = "gpt-3.5-turbo";
    	String message = "{\"role\": \"system\", \"content\": \"返答は日本語で\"},{\"role\": \"user\", \"content\": \" + preMessage + \"}";
    	String content =  "";
    	try {
    		// HTTPリクエストの作成
    		URL obj = new URL(url);
    		HttpURLConnection con = (HttpURLConnection) obj.openConnection();
    		con.setRequestMethod("POST");
    		con.setRequestProperty("Content-Type", "application/json");
    		con.setRequestProperty("Authorization", "Bearer " + api_key);
    		con.setDoOutput(true);

    		// リクエストの送信
    		OutputStreamWriter out = new OutputStreamWriter(con.getOutputStream());
    		out.write("{\"model\": \"" + model + "\", \"messages\": [" + message + "]}");
    		out.close();

    		// レスポンスの取得
    		BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
    		Gson gson = new Gson();
    		JsonObject jsonResponse = gson.fromJson(in, JsonObject.class);
    		JsonArray choicesArray = jsonResponse.getAsJsonArray("choices");
    		JsonObject messageObject = choicesArray.get(0).getAsJsonObject().get("message").getAsJsonObject();
    		content = messageObject.get("content").getAsString();
    		
    		// レスポンスの出力
    		System.out.println(content);
    	} catch (Exception e) {
    		System.out.println(e);
    	}  
    	return new ResponseEntity<>(content, HttpStatus.OK);
    }
}

■Maven

なんでGoogleが出てくるの?

GoogleのGsonを使って
Json形式の値を操作できるようにする為
※Googleだからって何か特別な操作はいらない

<dependency>
	<groupId>com.google.code.gson</groupId>
	<artifactId>gson</artifactId>
	<version>2.8.8</version>
</dependency>
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