SpringCloud-hystrix熔断器

一、maven配置

 <groupId>com.wk.sc</groupId>
    <artifactId>springcloud-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

二、application.yml配置

server:
  port: 7072
spring:
  application:
    name: service-ribbon-hystrix
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka

三、启动类

@SpringBootApplication
@EnableEurekaClient //启用客户端发现配置
@EnableDiscoveryClient //启用DiscoveryClient实现
@EnableHystrix //开启 hystrix
public class ServiceRibbonHystrixApplication {

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

    @Bean //配置rest实例
    @LoadBalanced  //配置负载均衡
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

四、服务调用

/**
 * 服务调用
 */
@Service
public class HelloService {

    @Autowired
    private RestTemplate restTemplate;

    /**
     * 服务调用
     *
     * @param name
     * @return
     */
    @HystrixCommand(fallbackMethod = "hiError")
    public String hiService(String name) {
        return restTemplate.getForObject("http://service-hi/hi?name=" + name, String.class); //service-hi大小写不敏感
    }

    /**
     * 熔断处理
     *
     * @param name
     * @return
     */
    public String hiError(String name) {
        return "hi," + name + ",sorry,error!";
    }

}

五、控制器调用服务

/**
 * 服务调用模拟
 *
 */
@RestController
public class HelloController {

    @Autowired
    private HelloService helloService;

    @GetMapping(value = "/hi")
    public String hi(@RequestParam String name) {
        return helloService.hiService(name);
    }

}