如何利用Java对接百度AI接口进行情感分析

<dependencies>
    <dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <version>20190722</version>
    </dependency>
</dependencies>

import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class SentimentAnalysis {
    public static void main(String[] args) {
        String apiKey = "YOUR_API_KEY";
        String secretKey = "YOUR_SECRET_KEY";
        String text = "今天天气真好";

        try {
            String result = sentimentAnalysis(apiKey, secretKey, text);
            JSONObject jsonObject = new JSONObject(result);
            int sentiment = jsonObject.getJSONObject("items").getInt("sentiment");
            System.out.println("情感倾向： " + sentiment);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String sentimentAnalysis(String apiKey, String secretKey, String text) throws Exception {
        String url = "https://aip.baidubce.com/rpc/2.0/nlp/v1/sentiment_classify";
        String param = "text=" + URLEncoder.encode(text, "UTF-8");

        String accessToken = getAccessToken(apiKey, secretKey);
        url = url + "?charset=UTF-8&access_token=" + accessToken;

        URL realUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        connection.setRequestProperty("Content-Length", String.valueOf(param.getBytes().length));
        connection.setDoOutput(true);
        connection.getOutputStream().write(param.getBytes());

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line;
        StringBuilder result = new StringBuilder();
        while ((line = in.readLine()) != null) {
            result.append(line);
        }

        return result.toString();
    }

    public static String getAccessToken(String apiKey, String secretKey) throws Exception {
        String grantType = "client_credentials";
        String url = "https://aip.baidubce.com/oauth/2.0/token?grant_type=" + grantType + "&client_id=" + apiKey + "&client_secret=" + secretKey;

        URL realUrl = new URL(url);
        HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
        connection.setRequestMethod("GET");

        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line;
        StringBuilder result = new StringBuilder();
        while ((line = in.readLine()) != null) {
            result.append(line);
        }

        JSONObject jsonObject = new JSONObject(result.toString());
        String accessToken = jsonObject.getString("access_token");

        return accessToken;
    }
}