0)前置准备,我们使用zk作为注册中心,先启动zk,也就是2181端口。
1)父工程pom.xml
4.0.0
com.imooc
dubbo-demo
pom
1.0-SNAPSHOT
UTF-8
11
11
api
consumer
provider
2)api
pom.xml
4.0.0
com.imooc
dubbo-demo-api
1.0-SNAPSHOT
UTF-8
11
11
2个接口
package com.imooc.springboot.dubbo.demo;
public interface CityService {
String city(Integer cityId);
}
package com.imooc.springboot.dubbo.demo;
public interface DemoService {
String sayHello(String name);
}
3)服务1
application.properties
server.port=8082
#####dubbo服务消费者#####
#应用名字
spring.dubbo.application.name=demo-consumer
#扫描的包
spring.dubbo.scan=com.imooc.springboot.dubbo.demo.consumer
# 从哪个注册中心取服务
spring.dubbo.registry.address=zookeeper://127.0.0.1:2181
# 使用的协议名字(可缺,估计默认的就是这个)
spring.dubbo.protocol.name=dubbo
# 使用的协议端口(不可缺,别的端口如:20881等也是可以,这个应该是唯一的,provider用过了,consumer就不能用了)
spring.dubbo.protocol.port=20881
Main.java
package com.imooc.springboot.dubbo.demo.consumer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(ConsumerApplication.class,args);
}
}
DemoController.java
package com.imooc.springboot.dubbo.demo.consumer.controller;
import com.alibaba.dubbo.config.annotation.Reference;
import com.imooc.springboot.dubbo.demo.DemoService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class DemoController {
@Reference
private DemoService demoService;
/**
* 浏览器中访问 http://localhost:8082/sayHello?name="22"
*
* @param name
* @return
*/
@RequestMapping("/sayHello")
public String sayHello(@RequestParam String name) {
return demoService.sayHello(name);
}
}
CityServiceImpl.java // 这里我们让消费者也是生产者,我们也提供一些实现
package com.imooc.springboot.dubbo.demo.consumer.service;
import com.alibaba.dubbo.config.annotation.Service;
import com.imooc.springboot.dubbo.demo.CityService;
@Service
public class CityServiceImpl implements CityService {
@Override
public String city(Integer cityId) {
return "你的cityId=" + cityId;
}
}
4)服务2
pom.xml
org.springframework.boot
spring-boot-starter-parent
1.5.3.RELEASE
4.0.0
com.imooc
dubbo-demo-provider
UTF-8
11
11
io.dubbo.springboot
spring-boot-starter-dubbo
1.0.0
com.imooc
dubbo-demo-api
1.0-SNAPSHOT
org.springframework.boot
spring-boot-starter-web
RELEASE
compile
ProviderApplication.java
package com.imooc.springboot.dubbo.demo.provider;
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);
}
}
CityController.java
package com.imooc.springboot.dubbo.demo.provider.controller;
import com.alibaba.dubbo.config.annotation.Reference;
import com.imooc.springboot.dubbo.demo.CityService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class CityController {
@Reference
private CityService cityService;
/**
* http://localhost:8081/cityId?cityId=1
*
* @param cityId
* @return
*/
@RequestMapping("/cityId")
public String cityId(@RequestParam Integer cityId) {
return cityService.city(cityId);
}
}
DemoServiceImpl.java
package com.imooc.springboot.dubbo.demo.provider.service;
import com.alibaba.dubbo.config.annotation.Service;
import com.imooc.springboot.dubbo.demo.DemoService;
@Service
public class DemoServiceImpl implements DemoService {
public String sayHello(String name) {
return "Hello, consumer" + name + " (i am provider)";
}
}
运行:
打开zk,观察下注册中心中的数据:
所以,zk中记录的是:每一个接口的生产者和消费者是谁。这样子有人消费接口时,就可以查找一个就行。
总结dubbo的使用:
1.api中写接口
2.@Service注解使用dubbo的,不是Spring的那个
3.Controller中使用某个Service时使用@Reference而不是@Autowired
就这么简单,每个服务既是生产者又是消费者!所以我们可以轻松的实现集群,GateWay去引用各个服务的实现即可,实现所谓的微服务。