springcloud(Brixton版) EurekaServer Ribbon Hystrix

水深无声 2023-08-17 16:26 128阅读 0赞

[https://blog.csdn.net/qq\_33371766/article/details/101623526][https_blog.csdn.net_qq_33371766_article_details_101623526] 跟这篇博文大致一样，新增了Hystrix熔断机制，调用的微服务报错的话，就走默认的方法，返回“error”字符。

1.创建springboot项目。

2.pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <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.didispace</groupId>
       <artifactId>eureka-ribbon</artifactId>
       <version>1.0.0</version>
       <packaging>jar</packaging>
    
       <name>eureka-ribbon</name>
       <description>Spring Cloud project</description>
    
       <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.3.5.RELEASE</version>
          <relativePath/> 
       </parent>
    
       <properties>
          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
          <java.version>1.8</java.version>
       </properties>
    
       <dependencies>
          <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-hystrix</artifactId>
          </dependency>
          <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-ribbon</artifactId>
          </dependency>
          <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-eureka</artifactId>
          </dependency>
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
    
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
          </dependency>
       </dependencies>
    
       <dependencyManagement>
          <dependencies>
             <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Brixton.RELEASE</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>
    
    </project>

3.application.properties

spring.application.name=ribbon-consumer
    server.port=3333
    eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

4.service

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.web.client.RestTemplate;
    
    @Service
    public class ComputeService {
    
        @Autowired
        RestTemplate restTemplate;
    
        @HystrixCommand(fallbackMethod = "addServiceFallback") //这里如果调用微服务出错就调用默认的方法 使整个流程不报错
        public String addService() {
            return restTemplate.getForEntity("http://COMPUTE-SERVICE/add?a=10&b=20", String.class).getBody();
        }
    
        public String addServiceFallback() {
            return "error";
        }
    
    }

5.controller

import com.didispace.service.ComputeService;
    import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    import java.util.Map;
    
    @RestController
    public class ConsumerController {
    
        @Autowired
        private ComputeService computeService;
    
        @RequestMapping(value = "/add", method = RequestMethod.GET)
        public String add() {
            return computeService.addService();
        }
    
    }

6.启动类

import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    @EnableCircuitBreaker
    public class RibbonApplication {
    
       @Bean
       @LoadBalanced
       RestTemplate restTemplate() {
          return new RestTemplate();
       }
    
       public static void main(String[] args) {
          SpringApplication.run(RibbonApplication.class, args);
       }
    
    }

7.访问：[http://localhost:1111/][http_localhost_1111]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70][]

[http://192.168.8.1:3333/add][http_192.168.8.1_3333_add]

如果计算服务正常则是：

![20190928173007138.png][]

测试一下：关闭计算服务或者计算服务接口报错：

![20190928173107293.png][]

出现了默认的error。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70 1][]

上面是手动让接口报错。

[https_blog.csdn.net_qq_33371766_article_details_101623526]: https://blog.csdn.net/qq_33371766/article/details/101623526
[http_localhost_1111]: http://localhost:1111/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70]: /images/20230810/060574fd38d840c6b260246be8f30ecd.png
[http_192.168.8.1_3333_add]: http://192.168.8.1:3333/add
[20190928173007138.png]: /images/20230810/fbe7ecf3917548089239c06625001b7f.png
[20190928173107293.png]: /images/20230810/ad69e1ec1c514cffb0769441b1ff620a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70 1]: /images/20230810/7ba3461859d74e5385dfc9b1292399c9.png