【互联网一线大厂 Java 程序员面试 + 学习指南】含全面面试知识点面试技巧与最新技术实操内容

代码教程

三、最新技术实操内容

（一）微服务架构实践

1. 服务注册与发现（Spring Cloud Alibaba Nacos）

环境搭建

# 下载Nacos服务器
wget https://github.com/alibaba/nacos/releases/download/2.2.3/nacos-server-2.2.3.tar.gz
tar -zxvf nacos-server-2.2.3.tar.gz
cd nacos/bin
# 启动Nacos（单机模式）
sh startup.sh -m standalone

服务注册示例（Spring Boot应用）

// 添加依赖
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <version>2022.0.0.0-RC2</version>
</dependency>

// 配置文件 application.yml
spring:
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848

// 主类添加注解
@SpringBootApplication
@EnableDiscoveryClient
public class UserServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserServiceApplication.class, args);
    }
}

2. 服务调用与负载均衡（OpenFeign + Ribbon）

// 添加依赖
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

// 创建Feign客户端接口
@FeignClient(name = "order-service")
public interface OrderServiceClient {
    @GetMapping("/orders/{userId}")
    List<Order> getOrdersByUserId(@PathVariable("userId") Long userId);
}

// 主类启用Feign
@SpringBootApplication
@EnableFeignClients
public class UserServiceApplication { ... }

3. 网关（Spring Cloud Gateway）

// 添加依赖
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>

// 配置路由规则
spring:
  cloud:
    gateway:
      routes:
        - id: user_route
          uri: lb://user-service
          predicates:
            - Path=/api/users/**
        - id: order_route
          uri: lb://order-service
          predicates:
            - Path=/api/orders/**

（二）容器化与Kubernetes

1. Docker基础操作

# 构建镜像
docker build -t user-service:v1 .

# 运行容器
docker run -d -p 8080:8080 --name user-service user-service:v1

# 查看容器日志
docker logs -f user-service

# 创建Docker网络
docker network create microservice-network

# 连接容器到网络
docker network connect microservice-network user-service

2. Kubernetes部署应用

Deployment配置示例（user-service-deployment.yaml）

apiVersion: apps/v1
kind: Deployment
metadata:
  name: user-service
spec:
  replicas: 3
  selector:
    matchLabels:
      app: user-service
  template:
    metadata:
      labels:
        app: user-service
    spec:
      containers:
      - name: user-service
        image: user-service:v1
        ports:
        - containerPort: 8080
        env:
        - name: DB_URL
          valueFrom:
            configMapKeyRef:
              name: db-config
              key: db-url

Service配置示例（user-service-service.yaml）

apiVersion: v1
kind: Service
metadata:
  name: user-service
spec:
  selector:
    app: user-service
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: ClusterIP

部署应用

# 创建ConfigMap
kubectl create configmap db-config --from-literal=db-url=jdbc:mysql://mysql-service:3306/users

# 部署应用
kubectl apply -f user-service-deployment.yaml
kubectl apply -f user-service-service.yaml

# 查看部署状态
kubectl get deployments
kubectl get services

（三）云原生技术实践

1. 服务网格（Istio）

# 安装Istio
curl -L https://istio.io/downloadIstio | sh -
cd istio-1.18.2
export PATH=$PWD/bin:$PATH
istioctl install --set profile=demo -y

# 注入Sidecar
kubectl label namespace default istio-injection=enabled

# 部署示例应用
kubectl apply -f samples/bookinfo/platform/kube/bookinfo.yaml

# 创建网关
kubectl apply -f samples/bookinfo/networking/bookinfo-gateway.yaml

# 验证部署
istioctl analyze

2. 可观测性（Prometheus + Grafana）

Prometheus配置（prometheus.yml）

global:
  scrape_interval: 15s

scrape_configs:
  - job_name: 'istio-mesh'
    kubernetes_sd_configs:
      - role: endpoints
    relabel_configs:
      - source_labels: [__meta_kubernetes_service_name]
        regex: istio-telemetry;prometheus
        action: keep

部署Prometheus和Grafana

kubectl apply -f samples/addons
kubectl rollout status deployment prometheus -n istio-system
kubectl rollout status deployment grafana -n istio-system

（四）高性能开发实践

1. Reactor响应式编程

// 添加依赖
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

// 创建响应式Repository
public interface UserRepository extends ReactiveCrudRepository<User, Long> {
    Flux<User> findByAgeGreaterThan(int age);
}

// 创建响应式Controller
@RestController
@RequestMapping("/users")
public class UserController {
    private final UserRepository userRepository;

    public UserController(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    @GetMapping
    public Flux<User> getAllUsers() {
        return userRepository.findAll();
    }

    @PostMapping
    public Mono<User> createUser(@RequestBody User user) {
        return userRepository.save(user);
    }
}

2. 异步编程（CompletableFuture）

public class AsyncService {
    private final ExecutorService executor = Executors.newFixedThreadPool(10);

    public CompletableFuture<User> getUserDetails(Long userId) {
        return CompletableFuture.supplyAsync(() -> {
            // 模拟数据库查询
            return userRepository.findById(userId)
                    .orElseThrow(() -> new RuntimeException("User not found"));
        }, executor);
    }

    public CompletableFuture<List<Order>> getOrders(Long userId) {
        return CompletableFuture.supplyAsync(() -> {
            // 模拟远程调用
            return orderServiceClient.getOrdersByUserId(userId);
        }, executor);
    }

    public CompletableFuture<UserProfile> getUserProfile(Long userId) {
        CompletableFuture<User> userFuture = getUserDetails(userId);
        CompletableFuture<List<Order>> ordersFuture = getOrders(userId);

        return userFuture.thenCombine(ordersFuture, (user, orders) -> 
            new UserProfile(user, orders));
    }
}

（五）数据持久化实践

1. Redis高级应用（分布式锁）

// Redisson实现分布式锁
@Service
public class RedisLockService {
    private final RedissonClient redissonClient;

    public RedisLockService(RedissonClient redissonClient) {
        this.redissonClient = redissonClient;
    }

    public void processWithLock(String lockKey, Runnable task) {
        RLock lock = redissonClient.getLock(lockKey);
        try {
            // 尝试获取锁，等待10秒，自动释放时间30秒
            boolean isLocked = lock.tryLock(10, 30, TimeUnit.SECONDS);
            if (isLocked) {
                task.run();
            } else {
                throw new RuntimeException("获取锁失败");
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            throw new RuntimeException("获取锁被中断", e);
        } finally {
            if (lock.isHeldByCurrentThread()) {
                lock.unlock();
            }
        }
    }
}

2. 分库分表（ShardingSphere）

配置示例（application.yml）

spring:
  shardingsphere:
    datasource:
      names: ds0,ds1
      ds0:
        type: com.zaxxer.hikari.HikariDataSource
        jdbc-url: jdbc:mysql://localhost:3306/db0
        username: root
        password: root
      ds1:
        type: com.zaxxer.hikari.HikariDataSource
        jdbc-url: jdbc:mysql://localhost:3306/db1
        username: root
        password: root
    rules:
      sharding:
        tables:
          orders:
            actual-data-nodes: ds$->{0..1}.orders_$->{0..1}
            table-strategy:
              standard:
                sharding-column: order_id
                sharding-algorithm-name: order-table-inline
            key-generate-strategy:
              column: order_id
              key-generator-name: snowflake
        sharding-algorithms:
          order-table-inline:
            type: INLINE
            props:
              algorithm-expression: orders_$->{order_id % 2}
        key-generators:
          snowflake:
            type: SNOWFLAKE

上述实操内容涵盖了当前互联网大厂的主流技术栈，你可以根据自身情况进行实践。建议先搭建本地开发环境，逐步实现各模块功能，遇到问题可查阅官方文档或社区资源。如果需要进一步的代码解释或优化建议，随时告诉我。

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