1. 生成和驗證授權碼
2. 記錄授權時間和過期時間
3. 實現授權邏輯

以下是具體的實現方法：

1. 生成和驗證授權碼

可以使用加密技術生成和驗證授權碼。授權碼中可以包含有效期等信息，并使用密鑰進行簽名。

示例代碼：

java復制代碼
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
import java.util.Date;
import java.util.concurrent.TimeUnit;public class LicenseManager {private static final String SECRET_KEY = "your_secret_key";public static String generateLicense(String userId, long durationInDays) throws Exception {long currentTime = System.currentTimeMillis();long expiryTime = currentTime + TimeUnit.DAYS.toMillis(durationInDays);String data = userId + ":" + expiryTime;Mac sha256HMAC = Mac.getInstance("HmacSHA256");SecretKeySpec secretKey = new SecretKeySpec(SECRET_KEY.getBytes(), "HmacSHA256");sha256HMAC.init(secretKey);String hash = Base64.getEncoder().encodeToString(sha256HMAC.doFinal(data.getBytes()));return Base64.getEncoder().encodeToString((data + ":" + hash).getBytes());}public static boolean validateLicense(String license) throws Exception {String decodedLicense = new String(Base64.getDecoder().decode(license));String[] parts = decodedLicense.split(":");if (parts.length != 3) return false;String data = parts[0] + ":" + parts[1];String hash = parts[2];Mac sha256HMAC = Mac.getInstance("HmacSHA256");SecretKeySpec secretKey = new SecretKeySpec(SECRET_KEY.getBytes(), "HmacSHA256");sha256HMAC.init(secretKey);String calculatedHash = Base64.getEncoder().encodeToString(sha256HMAC.doFinal(data.getBytes()));if (!calculatedHash.equals(hash)) return false;long expiryTime = Long.parseLong(parts[1]);return System.currentTimeMillis() <= expiryTime;}
}

2. 記錄授權時間和過期時間

通過授權碼生成和驗證，可以記錄和檢查授權時間和過期時間。

3. 實現授權邏輯

在Spring Boot應用中，通過攔截器或過濾器來驗證每次請求的授權碼。

示例代碼：

創建一個攔截器

java復制代碼
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;@Component
public class LicenseInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {String license = request.getHeader("License-Key");if (license == null || !LicenseManager.validateLicense(license)) {response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "License is invalid or expired");return false;}return true;}
}

注冊攔截器

在Spring Boot配置類中注冊攔截器：

java復制代碼
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebConfig implements WebMvcConfigurer {@Autowiredprivate LicenseInterceptor licenseInterceptor;@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(licenseInterceptor).addPathPatterns("/**");}
}

4. 使用授權碼

公司使用項目時，需要將授權碼放在HTTP請求頭中：

http復制代碼
GET /your/api/endpoint
License-Key: generated_license_key

5. 重新授權

在3個月到期后，需要重新生成并分發新的授權碼。可以為此創建一個管理端點來幫助重新授權。

示例代碼：

java復制代碼
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;@RestController
public class LicenseController {@GetMapping("/generateLicense")public String generateLicense(@RequestParam String userId, @RequestParam long durationInDays) throws Exception {return LicenseManager.generateLicense(userId, durationInDays);}
}