1. Spring Cloud整合Dubbo

1.1 provider端配置

引入依赖

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

application.yml

dubbo:scan:# 指定 Dubbo 服务实现类的扫描基准包base-packages: com.tuling.mall.user.service
#  application:
#    name: ${spring.application.name}protocol:# dubbo 协议name: dubbo# dubbo 协议端口（ -1 表示自增端口，从 20880 开始）port: -1
#  registry:
#    #挂载到 Spring Cloud 注册中心  高版本可选
#    address: spring-cloud://127.0.0.1:8848spring:application:name: spring-cloud-dubbo-provider-usermain:# Spring Boot2.1及更高的版本需要设定allow-bean-definition-overriding: truecloud:nacos:# Nacos 服务发现与注册配置discovery:server-addr: 127.0.0.1:8848

服务实现类上配置@DubboService暴露服务

@DubboService
public class UserServiceImpl implements UserService {@Autowiredprivate UserMapper userMapper;@Overridepublic List<User> list() {return userMapper.list();}@Overridepublic User getById(Integer id) {return userMapper.getById(id);}
}

1.2 consumer端配置

引入依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-dubbo</artifactId>
</dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>

application.yml

dubbo:cloud:# 指定需要订阅的服务提供方，默认值*，会订阅所有服务，不建议使用subscribed-services: spring-cloud-dubbo-provider-user
#  application:
#    name: ${spring.application.name}protocol:# dubbo 协议name: dubbo# dubbo 协议端口（ -1 表示自增端口，从 20880 开始）port: -1
#  registry:
#    #挂载到 Spring Cloud 注册中心  高版本可选
#    address: spring-cloud://127.0.0.1:8848spring:application:name: spring-cloud-dubbo-consumer-usermain:# Spring Boot2.1及更高的版本需要设定allow-bean-definition-overriding: truecloud:nacos:# Nacos 服务发现与注册配置discovery:server-addr: 127.0.0.1:8848

当应用使用属性dubbo.cloud.subscribed-services为默认值时，日志中将会输出警告：

服务消费方通过@DubboReference引入服务

@RestController
@RequestMapping("/user")
public class UserConstroller {@DubboReferenceprivate UserService userService;@RequestMapping("/info/{id}")public User info(@PathVariable("id") Integer id){return userService.getById(id);}@RequestMapping("/list")public List<User> list(){return userService.list();}
}

1.3 从Open Feign迁移到Dubbo

Dubbo Spring Cloud 提供了方案，即 @DubboTransported 注解，支持在类，方法，属性上使用。能够帮助服务消费端的 Spring Cloud Open Feign 接口以及 @LoadBalanced RestTemplate Bean 底层走 Dubbo 调用（可切换 Dubbo 支持的协议），而服务提供方则只需在原有 @RestController 类上追加 Dubbo @Servce 注解（需要抽取接口）即可，换言之，在不调整 Feign 接口以及 RestTemplate URL 的前提下，实现无缝迁移。

修改服务提供者

@DubboService
@Slf4j
@RestController
@RequestMapping("/user")
public class UserServiceImpl implements UserService {@Autowiredprivate UserMapper userMapper;@Override@RequestMapping("/list")public List<User> list() {log.info("查询user列表");return userMapper.list();}@Override@RequestMapping("/getById/{id}")public User getById(@PathVariable("id") Integer id) {return userMapper.getById(id);}
}

服务消费端引入依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-dubbo</artifactId>
</dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

feign的实现，启动类上添加@EnableFeignClients

@SpringBootApplication
@EnableFeignClients
public class SpringCloudDubboConsumerUserFeignApplication {public static void main(String[] args) {SpringApplication.run(SpringCloudDubboConsumerUserFeignApplication.class, args);}}

feign接口添加 @DubboTransported 注解

@FeignClient(value = "spring-cloud-dubbo-provider-user-feign",path = "/user")
@DubboTransported(protocol = "dubbo")
public interface UserDubboFeignService {@RequestMapping("/list")public List<User> list();@RequestMapping("/getById/{id}")public User getById(@PathVariable("id") Integer id);
}@FeignClient(value = "spring-cloud-dubbo-provider-user-feign",path = "/user")
public interface UserFeignService {@RequestMapping("/list")public List<User> list();@RequestMapping("/getById/{id}")public User getById(@PathVariable("id") Integer id);
}

调用对象添加 @DubboTransported 注解

@RestController
@RequestMapping("/user")
public class UserConstroller {@DubboReferenceprivate UserService userService;@RequestMapping("/info/{id}")public User info(@PathVariable("id") Integer id){return userService.getById(id);}@Autowired@DubboTransportedprivate UserFeignService userFeignService;@RequestMapping("/list")public List<User> list(){return userFeignService.list();}@Autowiredprivate UserDubboFeignService userDubboFeignService;@RequestMapping("/list2")public List<User> list2(){return userDubboFeignService.list();}@Autowiredprivate RestTemplate restTemplate;@Bean@LoadBalanced@DubboTransportedpublic RestTemplate restTemplate() {return new RestTemplate();}@RequestMapping("/list3")public List<User> list3(){String url = "http://spring-cloud-dubbo-provider-user-feign/user/list";return restTemplate.getForObject(url, List.class);}}

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八：微服务调用组件Dubbo

1. Spring Cloud整合Dubbo

1.1 provider端配置

1.2 consumer端配置

1.3 从Open Feign迁移到Dubbo

八：微服务调用组件Dubbo相关推荐

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