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.cry.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://127.0.0.1:8848
spring:
application:
name: spring-cloud-dubbo-provider-user
main:
# Spring Boot2.1及更高的版本需要设定
allow-bean-definition-overriding: true
cloud:
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 {
@Autowired
private UserMapper userMapper;
@Override
public List<User> list() {
return userMapper.list();
}
@Override
public User getById(Integer id) {
return userMapper.getById(id);
}
}
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://127.0.0.1:8848
spring:
application:
name: spring-cloud-dubbo-consumer-user
main:
# Spring Boot2.1及更高的版本需要设定
allow-bean-definition-overriding: true
cloud:
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 {
@DubboReference
private 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();
}
}
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 {
@Autowired
private 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 {
@DubboReference
private UserService userService;
@RequestMapping("/info/{id}")
public User info(@PathVariable("id") Integer id){
return userService.getById(id);
}
@Autowired
@DubboTransported
private UserFeignService userFeignService;
@RequestMapping("/list")
public List<User> list(){
return userFeignService.list();
}
@Autowired
private UserDubboFeignService userDubboFeignService;
@RequestMapping("/list2")
public List<User> list2(){
return userDubboFeignService.list();
}
@Autowired
private RestTemplate restTemplate;
@Bean
@LoadBalanced
@DubboTransported
public 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);
}
}