用java调用百度云API写一个查询域名到期时间的接口

很高兴扮演ChitGPT，接下来我将为您提供有关如何使用Java调用百度云API查询域名到期时间的详细说明。

首先，您需要申请一个百度云账号并在控制台中创建一个新的应用程序，然后在应用程序中启用“域名API”服务。接着，您需要获取您的Access Key和Secret Key，这将用于与百度云API进行身份验证和授权。

在获得这些凭证之后，您可以使用Java中的HttpClient类来向百度API发送GET请求并获取JSON响应。以下为示例代码：

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

public class DomainExpirationQuery {

    private static final String API_URL = "https://domainapi.baidu.com/api/v3/domain/expiredate";

    public static void main(String[] args) {
        String domainName = "example.com";
        String accessKeyId = "yourAccessKeyId";
        String secretKey = "yourSecretKey";

        try {
            URL url = new URL(API_URL + "?apikey=" + accessKeyId + "&domain=" + domainName);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("User-Agent", "Mozilla/5.0");
            conn.setRequestProperty("X-bce-date", "20220101T010101Z");

            String auth = AuthUtils.generateAuthorization(accessKeyId, secretKey, "GET", 
                                                          url.toString(), null, conn.getRequestProperty("X-bce-date"));
            conn.setRequestProperty("Authorization", auth);

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

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

            System.out.println(response.toString());
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}

在上面的示例代码中，您需要将“example.com”替换为您要查询到期时间的域名，将“yourAccessKeyId”和“yourSecretKey”替换为您的百度云凭证。

请注意，您还需要在AuthUtils类中实现generateAuthorization方法以生成用于身份验证的Authorization头。这需要使用HMAC-SHA256算法和UTF-8字符集生成签名，并对其进行Base64编码。以下为示例代码：

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.SimpleTimeZone;

public class AuthUtils {
    private static final String BCE_AUTH_VERSION = "bce-auth-v1";
    private static final String BCE_DATE_FORMAT = "yyyyMMdd'T'HHmmss'Z'";
    private static final String BCE_TIME_ZONE = "UTC";

    public static String generateAuthorization(String accessKeyId, String secretAccessKey, String httpMethod,
                                                String uri, String params, String timestamp) {
        try {
            String authString = BCE_AUTH_VERSION + "/" + accessKeyId + "/"
                    + getFormattedTimestamp(timestamp) + "/1800";

            String httpHeaders = "";

            String httpQuery = (params != null && !params.isEmpty()) ? "?" + params : "";

            String signingKey = generateSigningKey(secretAccessKey, getFormattedTimestamp(timestamp), "bce/auth/v1");
            String auth = generateAuthString(authString, httpMethod.toUpperCase(), uri, httpQuery, httpHeaders,
                    timestamp, signingKey);

            return auth;
        } catch (Exception e) {
            throw new RuntimeException("Unable to generate authorization signature", e);
        }
    }

    private static String generateAuthString(String authString, String httpMethod, String uri, String httpQuery,
                                             String httpHeaders, String timestamp, String signingKey) throws NoSuchAlgorithmException {
        String canonicalRequest = httpMethod + "\n" + uri + httpQuery + "\n" + httpQuery + "\n" + httpHeaders + "\n\n" + "content-md5;content-type\n" + timestamp + "\n" + "x-bce-date:" + timestamp + "\n\n" + "content-md5;content-type;x-bce-date\n" + "UNSIGNED-PAYLOAD";

        String signing = hmacSha256(signingKey, canonicalRequest);

        String auth = authString + "/" + "host" + "/" + signing;

        return auth;
    }

    private static String hmacSha256(String secret, String message) {
        try {
            byte[] key = secret.getBytes(StandardCharsets.UTF_8);
            SecretKeySpec secretKeySpec = new SecretKeySpec(key, "HmacSHA256");

            Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(secretKeySpec);

            byte[] messageBytes = message.getBytes("UTF-8");
            byte[] result = mac.doFinal(messageBytes);

            return Base64.encodeBase64String(result);
        } catch (Exception e) {
            throw new RuntimeException("Unable to calculate a request signature: " + e.getMessage(), e);
        }
    }

    private static String generateSigningKey(String secretAccessKey, String dateStamp, String regionName) throws Exception {
        byte[] kSecret = ("Baidu" + secretAccessKey).getBytes(StandardCharsets.UTF_8);
        byte[] kDate = hmacSha256("Baidu" + dateStamp, kSecret).getBytes(StandardCharsets.UTF_8);
        byte[] kRegion = hmacSha256(regionName, kDate).getBytes(StandardCharsets.UTF_8);
        byte[] kService = hmacSha256("bce/auth/v1", kRegion).getBytes(StandardCharsets.UTF_8);
        byte[] kSigning = hmacSha256("bce/auth/v1", kService).getBytes(StandardCharsets.UTF_8);

        return Base64.encodeBase64String(kSigning);
    }

    private static String getFormattedTimestamp(String timestamp) {
        SimpleDateFormat sdf = new SimpleDateFormat(BCE_DATE_FORMAT, Locale.US);
        sdf.setTimeZone(new SimpleTimeZone(0, BCE_TIME_ZONE));
        if (timestamp == null) {
            return sdf.format(new Date());
        }
        Calendar cd = Calendar.getInstance();
        try {
            Date date = sdf.parse(timestamp);
            cd.setTime(date);
        } catch (Throwable ignored) {
        }
        return sdf.format(cd.getTime());
    }
}

最后，代码将输出响应的JSON字符串，其中包含查询到域名到期日期的信息。

希望这个例子能帮助您理解如何使用Java调用百度云API来查询域名到期时间！