SpringCloud服务消费(feign+Hystrix)(Finchley版本)

Love The Way You Lie 2023-02-12 05:26 11阅读 0赞

**这里实现基于eureka实现feign的负载均衡和熔断。**

**1.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.5.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.cxb</groupId>
        <artifactId>springcloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>serice-feign</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
            <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
        </properties>
    
        <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>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

**2.application.yml**

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    server:
      port: 8765
    spring:
      application:
        name: service-feign
    
    # 这里一定要开启熔断，不然没有效果的
    feign:
      hystrix:
        enabled: true

**3.ServiceHiHystric 熔断时访问的方法**

package com.cxb.springcloud.client.impl;
    
    import com.cxb.springcloud.client.HelloClient;
    import org.springframework.stereotype.Component;
    
    @Component
    public class ServiceHiHystric implements HelloClient {
    
        @Override
        public String hi(String name) {
            return "service is error,sorry "+name;
        }
    }

**4.HelloClient**

package com.cxb.springcloud.client;
    
    import com.cxb.springcloud.client.impl.ServiceHiHystric;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    
    /**
     *  value是服务名称
     */
    @FeignClient(value = "eureka-service",fallback = ServiceHiHystric.class)
    public interface HelloClient {
    
        @RequestMapping(value = "/hi",method = RequestMethod.GET)
        String hi(@RequestParam(value = "name") String name);
    }

**5.HelloController**

package com.cxb.springcloud.web;
    
    import com.cxb.springcloud.client.HelloClient;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloController {
    
        @Autowired
        HelloClient helloClient;
    
        @GetMapping(value = "/hi")
        public String sayHi(@RequestParam String name) {
            return helloClient.hi( name );
        }
    
    }

**6.SericeFeignApplication启动类**

package com.cxb.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.cloud.netflix.hystrix.EnableHystrix;
    import org.springframework.cloud.openfeign.EnableFeignClients;
    
    @SpringBootApplication
    @EnableEurekaClient
    @EnableDiscoveryClient
    @EnableFeignClients
    public class SericeFeignApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SericeFeignApplication.class, args);
        }
    
    }

测试：负载均衡

![20200524145818837.png][]

![2020052414583798.png][]

熔断：

![20200524145915476.png][]

**[学习相关代码下载][Link 1]**

[20200524145818837.png]: https://img-blog.csdnimg.cn/20200524145818837.png
[2020052414583798.png]: https://img-blog.csdnimg.cn/2020052414583798.png
[20200524145915476.png]: https://img-blog.csdnimg.cn/20200524145915476.png
[Link 1]: https://github.com/ChenXbFrank/SpringCloudFinchley-Code