1、首先创建一个ParentMoudle的java pom文件项目进行服务项目管理,其中要注意的是需要将配置成如下的dependencyManagement格式,否则子项目会报错;
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Greenwich.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
2、依次创建eurekaServer、provider、feignClient(主要是对外暴露),每个项目的parent设置成如下格式
<parent>
<groupId>com.yangfan</groupId>
<artifactId>springcloud_feign_parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
- 创建eurekaserver项目
1⃣️pom文件中引入spring-cloud-starter-netflix-eureka-server
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
</dependencies>
2⃣️ 配置yml文件:核心是设置eurekaClient的注册中心的地址
server:
port: 9010
spring:
application:
name: eureka-server
eureka:
client:
service-url:
#eureka 服务地址,如果是集群的话;需要指定其他集群eureka地址
defaultZone: http://127.0.0.1:9010/eureka
# 不注册自己
registry-with-eureka: false
#不拉服务
fetch-registry: false
3⃣️在启动类中开启@EnableEurekaServer注解,开启eurekaServer服务
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
- 创建provider项目
1⃣️项目引入spring-boot-starter-web项目、spring-cloud-starter-netfix-eureka-client依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--eureka客户端依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
</dependencies>
2⃣️设置eurekaServer的注册地址为:http://127.0.0.1:9010/eureka
server:
port: 9011
spring:
application:
name: sentinel-feign-provider
eureka:
client:
service-url:
#eureka 服务地址,如果是集群的话;需要指定其他集群eureka地址
defaultZone: http://127.0.0.1:9010/eureka #需要注册到注册中心的地址
# 不注册自己
3⃣️在启动类中开启@EnableEurekaClient注解,表示开启Eureka客户端发现功能
@EnableEurekaClient //开启Eureka客户端发现功能
@SpringBootApplication
public class SentinelFeignProviderApplication {
public static void main(String[] args) {
SpringApplication.run(SentinelFeignProviderApplication.class, args);
}
}
- 创将feign项目
1⃣️项目中引入spring-cloud-starter-netfix-eureka-client依赖、feign的起步依赖spring-cloud-starter-openfeign、sentinel依赖spring-cloud-starter-alibaba-sentinel
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--eureka客户端依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
<!--feign的起步依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
</dependencies>
2⃣️yml文件配置:开启sentinel对feign的支持、设置sentinel本地的dashboard地址、向eureka注册中心注册feign服务
server:
port: 9012
spring:
application:
name: sentinel-feign-client
cloud:
sentinel:
transport:
dashboard: localhost:9000 #开启 sentinel对feign的支持
#激活sentinel的支持
feign:
sentinel:
enabled: true
eureka:
client:
service-url:
#eureka 服务地址,如果是集群的话;需要指定其他集群eureka地址
defaultZone: http://127.0.0.1:9010/eureka #需要注册到注册中心的地址
# 不注册自己
3⃣️开启@EnableEurekaClient 注解表示向注册中心注册自己@EnableFeignClients表示开启FeignClient服务
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class SentinelFeignClientApplication {
public static void main(String[] args) {
SpringApplication.run(SentinelFeignClientApplication.class, args);
}
}
4⃣️创建一个FallbackService实现自FeignAgent并实现hello方法
@Component
public class FallbackService implements FeignAgent {
@Override
public String hello() {
return "系统繁忙请稍后!";
}
}
5⃣️在Feign中新建一个Controller,并引入FeignClient,在hello方法中调用feign的hello方法
@RestController
public class TestController {
@Autowired
private FeignAgent feignAgent;
@GetMapping("/hello")
public String hello(){
return feignAgent.hello();
}
}
6⃣️配置sentinel dashboard的流控规则,流控规则的编写形式为:http:请求方式:协议://服务名/请求路径跟参数 (GET:http://sentinel-feign-provider/hello)
最终效果如下