二、SpringBoot 整合 Dubbo 进阶，Provider 不使用 web 容器启动

demo github 地址

0、docker 启动 zk

docker-compose.yml

version: '3'
services:
  zoo1:
    image: zookeeper
    restart: always
    hostname: zoo1
    ports:
      - 2181:2181

docker-compose up -d

1、创建父 pom

    4.0.0

    com.csp
    dubbo-exam
    pom
    1.0-SNAPSHOT
    
        dubbo-api
        dubbo-provider
        dubbo-consumer
    

    
        
            
                com.101tec
                zkclient
                0.10
            

            
                org.apache.zookeeper
                zookeeper
                3.4.13
                pom
                
                    
                        org.slf4j
                        slf4j-log4j12
                    
                
            

            
                org.apache.curator
                curator-recipes
                2.8.0
            

            
                org.apache.dubbo
                dubbo-spring-boot-starter
                2.7.7
                
                    
                        org.slf4j
                        slf4j-log4j12
                    
                
            

            
                org.apache.dubbo
                dubbo
                2.7.7
            

            
                org.apache.curator
                curator-framework
                4.0.1
            
        
    

2、创建 API maven 工程

package com.csp.dubbo.demo;

public interface TestApiService {
    String sayHello(String name);
}

3、创建 Provider maven 工程

pom.xml

    
        dubbo-exam
        com.csp
        1.0-SNAPSHOT
    
    4.0.0

    dubbo-provider


    
        
            com.csp
            dubbo-api
            1.0-SNAPSHOT
        

        
            com.101tec
            zkclient
        

        
            org.apache.curator
            curator-recipes
        

        
            org.apache.dubbo
            dubbo-spring-boot-starter
        

        
            org.apache.dubbo
            dubbo
        

        
            org.apache.curator
            curator-framework
        
    

dubbo-provider.properties

dubbo.application.name=dubbo-demo-annotation-provider
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880

dubbo-provider.properties

###set log levels###
log4j.rootLogger=info, stdout
###output to the console###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d{dd/MM/yy HH:mm:ss:SSS z}] %t %5p %c{2}: %m%n

Application

package com.csp.dubbo.demo.provider;


import java.io.IOException;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

public class Application {

    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);
        context.start();
        System.in.read();
    }

    @Configuration
    @EnableDubbo(scanBasePackages = "com.csp.dubbo.demo.provider.impl")
    @PropertySource("classpath:dubbo-provider.properties")
    static class ProviderConfiguration {
        @Bean
        public RegistryConfig registryConfig() {
            RegistryConfig registryConfig = new RegistryConfig();
            registryConfig.setAddress("zookeeper://127.0.0.1:2181");
            return registryConfig;
        }
    }
}

TestApiServiceImpl

package com.csp.dubbo.demo.provider.impl;

import com.csp.dubbo.demo.TestApiService;
import org.apache.dubbo.config.annotation.DubboService;

@DubboService(version = "1.0.0", interfaceClass = TestApiService.class)
public class TestApiServiceImpl implements TestApiService {

    public String sayHello(String name) {
        System.out.println("我是 provider， 我被调用了");
        return name + " say hello";
    }
}

4、创建 Provider maven 工程

pom.xml

    
        dubbo-exam
        com.csp
        1.0-SNAPSHOT
    
    4.0.0

    dubbo-consumer

    
        
            com.csp
            dubbo-api
            1.0-SNAPSHOT
        

        
            com.101tec
            zkclient
            
                
                    org.slf4j
                    slf4j-log4j12
                
            
        

        
            org.apache.curator
            curator-recipes
        

        
            org.apache.dubbo
            dubbo-spring-boot-starter
        

        
            org.apache.dubbo
            dubbo
        

        
            org.apache.curator
            curator-framework
        

        
            org.springframework.boot
            spring-boot-starter-web
        
    

    
        
            
                org.springframework.boot
                spring-boot-starter-parent
                2.1.7.RELEASE
                pom
                import
            
        
    

application.properties

#spring项目名
spring.application.name=dubbo_auto_configuration_consumer_demo
#Dubbo provider configuration
dubbo.application.name=dubbo_consumer
dubbo.registry.protocol=zookeeper
dubbo.registry.address=zookeeper://127.0.0.1:2181

server.port=8082

log4j.properties

###set log levels###
log4j.rootLogger=info, stdout
###output to the console###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d{dd/MM/yy HH:mm:ss:SSS z}] %t %5p %c{2}: %m%n

Application

package com.csp.dubbo.demo.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }
}

TestController

package com.csp.dubbo.demo.consumer.controller;

import com.csp.dubbo.demo.Test2Service;
import com.csp.dubbo.demo.TestApiService;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @DubboReference(version = "1.0.0")
    TestApiService testApiService;

    @GetMapping("/sayHello")
    public Object sayHello(String name) {
        String hello = testApiService.sayHello(name);
        return hello;
    }
}

5、总结

1. 整体思路是将 web 相关的 maven 依赖从父 pom 中抽离出来，单独放到 consumer 中
2. dubbo 使用的日志的依赖是 slf4j-log4j12，spring boot 默认使用的是 logback-classic。二者有冲突，在笔者项目中，选择去除掉了 slf4j-log4j12