java获取钉钉用户access_token 完整代码

以下是获取钉钉用户access_token的完整Java代码示例：

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import com.alibaba.fastjson.JSONObject;

public class DingTalkAccessToken {
    
    public static void main(String[] args) {
        String appKey = "your_app_key"; // 应用的AppKey
        String appSecret = "your_app_secret"; // 应用的AppSecret
        String accessToken = getAccessToken(appKey, appSecret);
        System.out.println("Access token: " + accessToken);
    }
    
    public static String getAccessToken(String appKey, String appSecret) {
        String accessToken = null;
        String url = "https://oapi.dingtalk.com/gettoken?appkey=" + appKey + "&appsecret=" + appSecret;

        try {
            URL getUrl = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) getUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();

            InputStream inputStream = connection.getInputStream();
            byte[] data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();

            String result = new String(data, "UTF-8");
            JSONObject jsonObject = JSONObject.parseObject(result);
            accessToken = jsonObject.getString("access_token");

        } catch (IOException e) {
            e.printStackTrace();
        }

        return accessToken;
    }
}

请将代码中的`your_app_key`和`your_app_secret`替换为您的应用AppKey和AppSecret。