reCaptcha v3与JSP的集成

<script src="https://www.google.com/recaptcha/api.js?render=您的reCaptcha v3 API密钥"></script>
<script>
    grecaptcha.ready(function() {
        grecaptcha.execute('您的reCaptcha v3 API密钥', {action: '页面标识'}).then(function(token) {
            // 在此处可以将token发送到后端进行验证
        });
    });
</script>

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

public class RecaptchaVerifier {
    public static boolean verify(String token, String secretKey) throws Exception {
        String url = "https://www.google.com/recaptcha/api/siteverify";
        String params = "secret=" + URLEncoder.encode(secretKey, "UTF-8") + "&response=" + URLEncoder.encode(token, "UTF-8");

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("POST");
        con.setDoOutput(true);

        con.getOutputStream().write(params.getBytes("UTF-8"));

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuilder response = new StringBuilder();

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

        // 解析响应结果
        JSONObject jsonObject = new JSONObject(response.toString());
        boolean success = jsonObject.getBoolean("success");
        return success;
    }
}