03--springCloudAlibaba 集成 dubbo及springcloud(feign) RPC框架

今天药忘吃喽~ 2022-12-22 04:37 10阅读 0赞

#### [上一章 创建一个工程并将其注册至nacos，并使用nacos配置][_nacos_nacos] ####

#### 上一章 我们创建了一个生产者服务(producer-example) 并将其注册至了nacos和使用可nacos配置。 本章我们将创建一个消费者服务。并使用dubbo和feign进行rpc通信 ####

1.  在spring-cloud-alibaba项目中像创建producer-example 一样 创建 consumer-example模块
2.  pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>spring-cloud-alibaba</artifactId>
            <groupId>spring-cloud-alibaba</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>consumer-example</artifactId>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <mainClass>com.cloud.alibaba.ConsumerApplication</mainClass>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

1.  ConsumerApplication.java

package com.cloud.alibaba;
    
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.boot.CommandLineRunner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    /** * @author 刘志强 * @date 2020/11/17 09:29 * @EnableDiscoveryClient 启动客户端 */
    @EnableDiscoveryClient
    @SpringBootApplication
    @Slf4j
    public class ConsumerApplication implements CommandLineRunner { 
    
    
        public static void main(String[] args) { 
            SpringApplication.run(ConsumerApplication.class, args);
        }
    
        @Override
        public void run(String... args) { 
            log.info("command已启动");
    
        }
    }

1.  nacos配置如下

Data ID: consumer-example-dev.yml
    Group：DEFAULT_GROUP
    配置格式：YAML
    配置内容：
    author:
        userName: 刘志强
        mailbox: 2425358736@qq.com
        
    
    Data ID: consumer-example.yml
    Group：DEFAULT_GROUP
    配置格式：YAML
    配置内容：
    server:
      port: 10001

1.  bootstrap.yml

spring:
      application:
        name: consumer-example
      profiles:
        active: dev
    
      main:
        allow-bean-definition-overriding: true
      cloud:
        nacos:
          discovery:
            # 服务注册地址
            server-addr: 101.37.152.195:8848
          config:
            server-addr: 101.37.152.195:8848
            # 配置文件格式
            file-extension: yml
            # 共享配置
            shared-dataids: application-${spring.profiles.active}.${spring.cloud.nacos.config.file-extension}
        refresh:
          enabled: true

1.  application-dev.yml 为consumer-example 和 producer-example 服务共享。在上一章已经创建过了

### DUBBO ###

1.  consumer-example 引入dubbo开发包

<dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>

1.  consumer-example 的bootstrap.yml 增加dubbo配置。也可以将此配置写在nacos中的consumer-example.yml里。 订阅producer-example服务

dubbo:
      registry:
        # 注册地址 nacos服务
        address: spring-cloud://101.37.152.195
      cloud:
        # 订阅
        subscribed-services: producer-example
      application:
        ## 启用服务质量
        qos-enable: true
        qos-port: 22222

1.  producer-example 模块引入dubbo开发包
2.  producer-example 的 bootstrap.yml加入dubbo配置

dubbo:
      registry:
        ## 注册地址 nacos
        address: spring-cloud://52.83.239.30
      scan:
        ## 暴露的服务
        base-packages: com.cloud.alibaba.rpc.dubbo.**
      ## 协议
      protocol:
        name: dubbo
        port: -1
      application:
        qos-enable: true
        qos-port: 22223
      cloud:
        # 不订阅任何服务 默认订阅所由服务
        subscribed-services: ""

1.  新建dubbo-api模块。存放 生产者 和 消费者 的通用接口与通用实体类
2.  dubbo-api 中 创建 DubboApiService 接口

package com.cloud.alibaba;
    
    /** * @author 刘志强 * @date 2020/11/17 14:48 */
    public interface DubboApiService { 
    
        /** * 获取名称 * @return */
        String getUserName();
    }

1.  producer-example 和 consumer-example 模块分别引入dubbo-api模块

<dependency>
            <groupId>spring-cloud-alibaba</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

1.  producer-example（生产者） 服务中实现DubboApiService 接口。并暴露此服务

package com.cloud.alibaba.rpc.dubbo;
    
    import com.cloud.alibaba.DubboApiService;
    import com.cloud.alibaba.domain.Author;
    import org.apache.dubbo.config.annotation.Service;
    import org.springframework.beans.factory.annotation.Autowired;
    
    /**
     * @author 刘志强
     * @date 2020/11/17 14:55
     */
    @Service(version = "1.0.0")
    public class DubboApiImpl implements DubboApiService {
    
        @Autowired
        private Author author;
    
        @Override
        public String getUserName() {
            return author.toString();
        }
    }

1.  @Service 注解是dubbo 包下的注解，别弄错了。
2.  consumer-example（消费者） 服务 消费此接口

package com.cloud.alibaba.controller;
    
    import com.cloud.alibaba.DubboApiService;
    import org.apache.dubbo.config.annotation.Reference;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /** * @author 刘志强 * @date 2020/11/17 14:58 */
    @RestController
    public class ConsumerController { 
    
        @Reference(version = "1.0.0", check = false)
        private DubboApiService dubboApiService;
    
        @GetMapping("getUserName")
        public String getUserName() { 
            return dubboApiService.getUserName();
        }
    
    }

1.  启动生产者 在启动消费者。浏览器访问 http://127.0.0.1:10001/getUserName

### Feign ###

1.  consumer-example 引入 openfeign 开发包

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

1.  consumer-example 的bootstrap.yml 配置 feign 和 hystrix

# 开启feign熔断
    feign:
      hystrix:
        enabled: true
    
    hystrix:
      command:
        default:
          execution:
            isolation:
              thread:
                # 超时毫秒
                timeoutInMilliseconds: 10000

1.  consumer-example 启动类增加 @EnableFeignClients 注解 开启Feign 客户端
2.  consumer-example 增加@FeignClient 接口

package com.cloud.alibaba.rpc.feign;
    
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.RequestHeader;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    
    /** * @author 刘志强 * @date 2020/11/17 15:23 * producer-example 生产者服务的 spring.application.name * fallback 当下游服务异常时，本服务的回滚处理类 */
    @FeignClient(value = "producer-example", fallback = FeignServiceImpl.class)
    public interface FeignService { 
    
        /** * 获取用户名 * @param authorization * @param userName * @return */
        @RequestMapping(method = RequestMethod.GET, value = "/getUserName")
        String getUserName(@RequestHeader(value = "Authorization") String authorization, @RequestParam("userName") String userName);
    
    }

package com.cloud.alibaba.rpc.feign;
    
    import org.springframework.stereotype.Component;
    
    /**
     * @author 刘志强
     * @date 2020/11/17 15:24
     */
    @Component
    public class FeignServiceImpl implements FeignService {
        @Override
        public String getUserName(String authorization, String userName) {
            return "下游服务调用失败";
        }
    }

1.  producer-example 服务增加 ProducerController 并编写getUserName 接口

package com.cloud.alibaba.controller;
    
    import com.cloud.alibaba.domain.Author;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.servlet.http.HttpServletRequest;
    
    /**
     * @author 刘志强
     * @date 2020/11/17 15:31
     */
    @RestController
    @Slf4j
    public class ProducerController {
    
        @Autowired
        private Author author;
        @Autowired
        private HttpServletRequest httpServletRequest;
    
        @GetMapping("/getUserName")
        public String getUserName(String userName) {
            log.info(userName);
            String authorization = httpServletRequest.getHeader("Authorization");
            log.info(authorization);
            return author.toString();
        }
    }

1.  分别启动 producer-example 与 consumer-example 服务
2.  访问 http://127.0.0.1:10001/getUserNameTwo?userName=%E5%88%98%E5%BF%97%E5%BC%BA

#### [源码地址][Link 1] ####

[_nacos_nacos]: https://blog.csdn.net/lzq199528/article/details/109741851
[Link 1]: https://gitee.com/lzq199528/spring-cloud-alibaba