1. restTemplate+ribbon使用hystrix
1.1 引入依赖
<!-- 配置hystrix断路器 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-hystrix</artifactId> </dependency>
1.2 在需要熔断的方法上添加注解
@Service public class HiService { @Autowired RestTemplate restTemplate; //需要熔断的方法 @HystrixCommand(fallbackMethod="hiError")//熔断后执行的方法 public String sayHi() { return restTemplate.getForObject("http://SERVICE-HI/info", String.class); } //熔断后执行的方法 public String hiError() { return "sorry hi error"; } }
1.3 在启动类中声明使用hystrix
@SpringBootApplication @EnableDiscoveryClient//向服务中心注册 @RestController @EnableHystrix//启用熔断机制 public class ConsumerRibbon { @Autowired private HiService hiService; public static void main(String[] args) { SpringApplication.run(ConsumerRibbon.class, args); } @Bean @LoadBalanced//使用这个restTemplate开启负载均衡 RestTemplate initRestTemplate(){ return new RestTemplate(); } @RequestMapping("info") public String hiConsumer() { String response=hiService.sayHi(); return response; } }
1.4 启动注册中心和cloud-consumer-ribbon,访问http://localhost:8764/info 返回sorry hi error
启动service-hi,访问http://localhost:8764/info 返回hello eureka client 8762
2 feign使用hystrix
2.1 feign自带熔断器,无需导入hystrix的依赖,但是需要导入以下依赖,否则回报java.lang.NoClassDefFoundError: com/netflix/hystrix/contrib/javanica/aop/aspectj/HystrixCommandAspect错误
<dependency> <groupId>com.netflix.hystrix</groupId> <artifactId>hystrix-javanica</artifactId> </dependency>
2.2 在配置文件中启用hystrix,默认是关闭的
feign:
hystrix:
enabled: true
2.3 指定熔断后要执行的类
@FeignClient(value="service-hi",fallback=HiServiceHystric.class)//指定调用哪个服务提供者,指定熔断后的执行的类 public interface IHiService { @RequestMapping(value="/info",method=RequestMethod.GET)//指定调用服务提供者的哪个接口 String info(); @RequestMapping(value="/info",method=RequestMethod.GET)//指定调用服务提供者的哪个接口 String hi(); }
2.4 指定熔断后要执行对应的方法
@Component public class HiServiceHystric implements IHiService { //熔断后执行相应的方法 public String info() { return "sorry info feign"; } public String hi() { return "sorry hi feign"; } }
2.5 在启动类中声明启动hystrix
@EnableHystrix
2.6 启动注册中心和cloud-consumer-feign,访问http://localhost:8765/info 返回sorry info feign
启动service-hi,访问http://localhost:8765/info 返回hello eureka client 8762
3 使用熔断器监控(hystrix dashboard)
3.1 引入相应的jar依赖
<!-- 配置hystrix断路器 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-hystrix</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency>
3.2 在启动类中声明启动hystrix dashboard
@SpringBootApplication @EnableEurekaClient//向服务中心注册 @EnableHystrix//启用熔断机制 @EnableHystrixDashboard //启用熔断器监控页面 public class ConsumerRibbonApp { public static void main(String[] args) { SpringApplication.run(ConsumerRibbonApp.class, args); } @Bean @LoadBalanced//使用这个restTemplate开启负载均衡 RestTemplate initRestTemplate(){ return new RestTemplate(); } }
3.3 启动项目
4 熔断器聚合监控
如果多个项目都配置了hystrix和hystrix dashboard,想要在一个项目中的hystrix dashboard上看到其他项目的hystrix dashboard情况,就需要使用turbine进行聚合监控
4.1 创建springboot项目,引入jar依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.beifeng.hadoop</groupId> <artifactId>beifeng-spring-cloud-turbine</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>beifeng-spring-cloud-turbine</name> <url>http://maven.apache.org</url> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.RELEASE</version> <relativePath /> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Dalston.RC1</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 声明为web项目 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 配置eureka --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <!-- 引入hystrix turbine 熔断器聚合监控 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-turbine</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-netflix-turbine</artifactId> </dependency> </dependencies> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
4.2 在配置文件中配置那些项目要进行聚合监控
spring:
application:
name: service-turbine
server:
port: 8770
security:
basic:
enabled: false
turbine:
aggregator:
clusterConfig: default #指定聚合那些集群,多个使用 , 分隔,默认为default
appConfig: cloud-consumer-ribbon,cloud-consumer-feign #配置要监控的服务,多个使用 , 分隔
clusterNameExpression: new String("default")
eureka:
client:
serviceUrl:
defaultZone: http://peer1:8761/eureka/
4.3. 在启动类中声明启动turbine
@SpringBootApplication @EnableTurbine //开启turbine,该注解包含了@EnableDiscoveryClient public class TurbineApp { public static void main(String[] args) { SpringApplication.run(TurbineApp.class, args); } }
4.4 启动项目,在任何一个配置了hystrix dashboard的项目中查看聚合监控