1.nacos安装

2.项目父工程

请参考 : SpringCloud H系列 alibaba 2.1.1 (一) nacos1.X 注册中心服务端

3.项目结构

4.创建Feign 服务调用端

pom.xml

    <parent>
        <groupId>com.alibaba</groupId>
        <artifactId>spring-cloud-hoxton</artifactId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>alibaba-sentinel-feign-server</artifactId>
    <packaging>jar</packaging>

    <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>
    </dependencies>

SentinelFeignServerApplication.java 服务提供端启动类

/**
 * @author Lion Li
 */
@EnableDiscoveryClient // 启动Feign客户端
@SpringBootApplication
public class SentinelFeignServerApplication {

	public static void main(String[] args) {
		SpringApplication.run(SentinelFeignServerApplication.class, args);
	}

}

TestController.java 接口提供

/**
 * @author Lion Li
 */
@RestController
public class TestController {

	@PostMapping("/test")
	public String test(@RequestParam("name") String name) {
		return "服务提供端::返回值 => " + name;
	}

}

application.yml 配置文件

spring:
  application:
    name: alibaba-sentinel-feign-server
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.101.11:8848
server:
  port: 8000

启动服务提供端查看nacos

注册成功

5.创建Feign 服务消费端

pom.xml

    <parent>
        <groupId>com.alibaba</groupId>
        <artifactId>spring-cloud-hoxton</artifactId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>alibaba-sentinel-feign-client</artifactId>
    <packaging>jar</packaging>

    <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>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-transport-simple-http</artifactId>
        </dependency>
    </dependencies>

SentinelFeignClientApplication.java 服务消费端启动类

/**
 * @author Lion Li
 */
@EnableFeignClients // 启动Feign客户端
@SpringCloudApplication
public class SentinelFeignClientApplication {

	public static void main(String[] args) {
		SpringApplication.run(SentinelFeignClientApplication.class, args);
	}

}

TestService.java Feign远程接口调用

/**
 * @author Lion Li
 */
@FeignClient(name = "alibaba-sentinel-feign-server", 
		fallback = TestServiceFallback.class)
public interface TestService {

	/**
	 * 调用服务提供端的接口.
	 */
	@PostMapping("/test")
	String test(@RequestParam("name") String name);

}

TestServiceFallback.java 接口降级响应

/**
 * @author Lion Li
 * sentinel 降级处理
 */
@Component
public class TestServiceFallback implements TestService {

	@Override
	public String test(String name) {
		return "服务消费端::降级";
	}

}

TestController.java web接口

/**
 * @author Lion Li
 */
@RestController
public class TestController {

	@Autowired
	private TestService testService;

	@GetMapping("/test")
	public String test(@RequestParam("name") String name) {
		return testService.test(name);
	}

}

application.yml 配置文件

spring:
  application:
    name: alibaba-sentinel-feign-client
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.101.11:8848
    # sentinel 控制台地址
    sentinel:
      transport:
        dashboard: 127.0.0.1:8080
# Feign开启sentinel服务
feign:
  sentinel:
    enabled: true
server:
  port: 8002

启动服务消费端查看nacos