Java中的分布式系统开发基于 Zookeeper 与 Dubbo 的应用案例解析

./zkServer.sh start

<dependencies>
    <!-- Dubbo -->
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo</artifactId>
        <version>3.2.0</version>
    </dependency>
    <!-- Zookeeper 客户端 -->
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo-dependencies-zookeeper</artifactId>
        <version>3.2.0</version>
        <type>pom</type>
    </dependency>
</dependencies>

// src/main/java/com/example/api/GreetingService.java
package com.example.api;
public interface GreetingService {
    String sayHello(String name);
}

// src/main/java/com/example/provider/GreetingServiceImpl.java
package com.example.provider;
import com.example.api.GreetingService;
public class GreetingServiceImpl implements GreetingService {
    @Override
    public String sayHello(String name) {
        return "Hello, " + name + "! 欢迎使用 Dubbo + Zookeeper";
    }
}

# application.yml
dubbo:
  application:
    name: greeting-provider
  registry:
    address: zookeeper://127.0.0.1:2181
  protocol:
    name: dubbo
    port: 20880

// src/main/java/com/example/provider/ProviderApplication.java
package com.example.provider;
import org.apache.dubbo.config.annotation.DubboService;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ProviderApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProviderApplication.class, args);
        System.out.println("服务提供者已启动...");
    }
}
// 将服务暴露出去
@DubboService
class GreetingServiceImpl implements com.example.api.GreetingService {
    @Override
    public String sayHello(String name) {
        return "Hello, " + name + "! 来自 Provider 服务";
    }
}

# application.yml
dubbo:
  application:
    name: greeting-consumer
  registry:
    address: zookeeper://127.0.0.1:2181

// src/main/java/com/example/consumer/ConsumerApplication.java
package com.example.consumer;
import com.example.api.GreetingService;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ConsumerApplication {
    public static void main(String[] args) {
        var context = SpringApplication.run(ConsumerApplication.class, args);
        GreetingController controller = context.getBean(GreetingController.class);
        controller.testCall();
    }
}
import org.springframework.stereotype.Component;
@Component
class GreetingController {
    @DubboReference
    private GreetingService greetingService;
    public void testCall() {
        String result = greetingService.sayHello("Alice");
        System.out.println("Consumer 调用结果: " + result);
    }
}

./zkServer.sh start

服务提供者已启动...

Consumer 调用结果: Hello, Alice! 来自 Provider 服务