系统安全架构的深度解析与实践：Java代码实现

java复制代码
// 前端：输入校验  
public class InputValidator {  
public static boolean validateInput(String input) {  
// 简单的输入校验逻辑，例如检查空字符串或特殊字符  
if (input == null || input.isEmpty() || !input.matches("[a-zA-Z0-9]+")) {  
return false;  
        }  
return true;  
    }  
}  
// 后端：身份验证  
public class AuthenticationService {  
public static boolean authenticate(String username, String password) {  
// 假设有一个用户数据库，进行身份验证  
if ("admin".equals(username) && "password123".equals(password)) {  
return true;  
        }  
return false;  
    }  
}

java复制代码
// API网关：访问控制  
public class ApiGateway {  
public static boolean checkAccess(String userId, String resource) {  
// 简单的访问控制逻辑，例如基于角色的访问控制  
if ("admin".equals(userId) && "sensitiveResource".equals(resource)) {  
return true;  
        }  
return false;  
    }  
}

java复制代码
// 数据存储加密（AES）  
import javax.crypto.Cipher;  
import javax.crypto.KeyGenerator;  
import javax.crypto.SecretKey;  
import javax.crypto.spec.SecretKeySpec;  
import java.util.Base64;  
public class AESUtil {  
public static String encrypt(String content, String password) throws Exception {  
KeyGenerator kgen = KeyGenerator.getInstance("AES");  
        kgen.init(128, new SecureRandom(password.getBytes()));  
SecretKey secretKey = kgen.generateKey();  
byte[] enCodeFormat = secretKey.getEncoded();  
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");  
Cipher cipher = Cipher.getInstance("AES");  
        cipher.init(Cipher.ENCRYPT_MODE, key);  
byte[] result = cipher.doFinal(content.getBytes("utf-8"));  
return Base64.getEncoder().encodeToString(result);  
    }  
public static String decrypt(String content, String password) throws Exception {  
KeyGenerator kgen = KeyGenerator.getInstance("AES");  
        kgen.init(128, new SecureRandom(password.getBytes()));  
SecretKey secretKey = kgen.generateKey();  
byte[] enCodeFormat = secretKey.getEncoded();  
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");  
Cipher cipher = Cipher.getInstance("AES");  
        cipher.init(Cipher.DECRYPT_MODE, key);  
byte[] result = cipher.doFinal(Base64.getDecoder().decode(content));  
return new String(result, "utf-8");  
    }  
}

java复制代码
// 多因素认证示例  
public class MultiFactorAuthentication {  
public static boolean authenticate(String userId, String password, String otp) {  
// 假设有一个多因素认证服务  
if ("admin".equals(userId) && "password123".equals(password) && "123456".equals(otp)) {  
return true;  
        }  
return false;  
    }  
}

java复制代码
// 基于角色的访问控制（RBAC）  
public class RBACService {  
public static boolean checkPermission(String userId, String resource) {  
// 简单的权限检查逻辑  
if ("admin".equals(userId) && "allResources".contains(resource)) {  
return true;  
        }  
return false;  
    }  
}

java复制代码
// 防火墙日志记录和告警示例（伪代码）  
public class FirewallService {  
public static void logAndAlert(String accessLog) {  
// 假设有一个日志记录和告警服务  
        System.out.println("Access Log: " + accessLog);  
if (accessLog.contains("unauthorized access")) {  
            System.out.println("Alert: Unauthorized access detected!");  
        }  
    }  
}

java复制代码
// 入侵检测系统（IDS）示例（伪代码）  
public class IDSService {  
public static void detectIntrusion(String networkTraffic) {  
// 假设有一个入侵检测算法  
if (networkTraffic.contains("malicious pattern")) {  
            System.out.println("Alert: Malicious traffic detected!");  
        }  
    }  
}