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Feign-负载均衡

2022年11月09日 14:10:33服务端12

一、简介

Feign是一个声明式的伪Http客户端,它使得写Http客户端变得更简单。使用Feign,只需要创建一个接口并注解。它具有可插拔的注解特 性,可使用Feign 注解和JAX-RS注解。Feign支持可插拔的编码器和解码器。Feign默认集成了Ribbon,并和Eureka结合,默认实现了负载均衡的效果。

简而言之:

Feign 采用的是基于接口的注解
Feign 整合了ribbon,具有负载均衡的能力
整合了Hystrix,具有熔断的能力

二、项目实例(负载均衡

 1.注册中心eureka(eurekaserver)

 项目图

Feign-负载均衡 _ JavaClub全栈架构师技术笔记

      1.1 在pom.xml中加入以下依赖

<?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.example</groupId>

    <artifactId>eurekaserver</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>eurekaserver</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.12.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <spring-cloud.version>Edgware.SR3</spring-cloud.version>

    </properties>

    <dependencies>


        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</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>${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>

</project>


      1.2 application.properties 配置

server.port=8089
eureka.instance.hostname=127.0.0.1
#不要向注册中心注册自己
eureka.client.register-with-eureka=false
#禁止检索服务
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone=http://127.0.0.1:8089/eureka
spring.application.name=eurekserver

      1.3 开启eureka

package SpringCloud3;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;


/**
 * Hello world!
 *
 */

@EnableEurekaServer
@SpringBootApplication
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }


}

2 创建2个生产者服务器(provider-demo2,provider-demo3)

  2.1  provider-demo2

项目图               Feign-负载均衡 _ JavaClub全栈架构师技术笔记

         2.1.1 在pom.xml中加入以下依赖

      

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

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

    <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-ribbon</artifactId>
            <version>1.3.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>25.1-jre</version>
        </dependency>
        <dependency>
            <groupId>com.diffplug.guava</groupId>
            <artifactId>guava-cache</artifactId>
            <version>19.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId> spring-cloud-starter-netflix-ribbon</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>

</project>

         2.1.2 application.properties 配置

         

server.port=8115

#设置应用的名称

spring.application.name=provider-demo2-ribbon


#服务注册的Eureka Server地址

eureka.client.serviceUrl.defaultZone=http://127.0.0.1:8089/eureka
##http://shumeigang:123456@127.0.0.1:8081/eureka
eureka.instance.prefer-ip-address=true
#设置注册ip
#表示是否将自己注册在EurekaServer上,默认为true。由于当前应用就是EurekaServer,所以置为false
eureka.client.register-with-eureka=true
#表示表示是否从EurekaServer获取注册信息,默认为true。单节点不需要同步其他的EurekaServer节点的数据
eureka.client.fetch-registry=true


#自定义应用实例id

#健康检查

##eureka.client.healthcheck.enabled=true

         2.1.3 Controller

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class ProviderController {

    @GetMapping("/Provider/hi")
    public String sayHi(){
        return "provider-demo22";
    }

}

 

 2.2  provider-demo3

                  项目图  Feign-负载均衡 _ JavaClub全栈架构师技术笔记

       2.2.1 在pom.xml中加入以下依赖

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

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

    <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-ribbon</artifactId>
            <version>1.3.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>25.1-jre</version>
    </dependency>
    <dependency>
        <groupId>com.diffplug.guava</groupId>
        <artifactId>guava-cache</artifactId>
        <version>19.0.0</version>
    </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId> spring-cloud-starter-netflix-ribbon</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>

</project>

       2.2.2 application.properties 配置

server.port=8114

#设置应用的名称

spring.application.name=provider-demo3-ribbon


#服务注册的Eureka Server地址

eureka.client.serviceUrl.defaultZone=http://127.0.0.1:8089/eureka
  ##http://shumeigang:123456@127.0.0.1:8081/eureka
eureka.instance.prefer-ip-address=true
#设置注册ip
#表示是否将自己注册在EurekaServer上,默认为true。由于当前应用就是EurekaServer,所以置为false
eureka.client.register-with-eureka=true
#表示表示是否从EurekaServer获取注册信息,默认为true。单节点不需要同步其他的EurekaServer节点的数据
eureka.client.fetch-registry=true


#自定义应用实例id

#健康检查

##eureka.client.healthcheck.enabled=true

       2.2.3 Controller

package com.example.demo.controller;

import com.example.demo.Entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class ProviderController {
    @GetMapping("/Provider/hi")
    public String sayHi(){
        return "provider-demo3";
    }
}

创建一个Feign

         项目图 

      Feign-负载均衡 _ JavaClub全栈架构师技术笔记

 3.1 在pom.xml中加入以下依赖

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

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

    <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-openfeign</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>${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>

</project>

 3.1 application.properties 配置

   

server.port=8707

#设置应用的名称

spring.application.name=FeignClient3

#服务注册的Eureka Server地址

eureka.client.serviceUrl.defaultZone=http://127.0.0.1:8089/eureka
##http://shumeigang:123456@127.0.0.1:8081/eureka
eureka.instance.prefer-ip-address=true
#设置注册ip
#表示是否将自己注册在EurekaServer上,默认为true。由于当前应用就是EurekaServer,所以置为false
eureka.client.register-with-eureka=true
#表示表示是否从EurekaServer获取注册信息,默认为true。单节点不需要同步其他的EurekaServer节点的数据
eureka.client.fetch-registry=true


 3.2 Feign 接口

package com.example.demo.feign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

//@FeignClient("PROVIDER-DEMO3-RIBBON")

@FeignClient(value = "PROVIDER-DEMO3-RIBBON")
//@FeignClient(value = "PROVIDER-DEMO3-RIBBON",url="http://127.0.0.1:8115/")
public interface FeignService {

    @GetMapping("/Provider/hi")
    String sayHi();


}

3.3 Feign Controller

package com.example.demo.Controller;

import com.example.demo.feign.FeignFallBack;
import com.example.demo.feign.FeignService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by cong on 2018/5/17.
 */
@RestController
public class ConsumerController {

      @Autowired
    private FeignService feignService;


    @GetMapping("/Consumer/hi")
    public String sayHi(){

        return feignService.sayHi();
    }


}

3.4 Feign 起动

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class DemoApplication {

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

}

 

运行结果:

1 先运行 eureka

 2, 2个生产者服务器

3 Feign 起动

eureka结果:

http://127.0.0.1:8089/

Feign-负载均衡 _ JavaClub全栈架构师技术笔记

Feign 结果 负载均衡

http://127.0.0.1:8707/Consumer/hi

provider-demo22

Feign-负载均衡 _ JavaClub全栈架构师技术笔记

http://127.0.0.1:8707/Consumer/hi

provider-demo3

Feign-负载均衡 _ JavaClub全栈架构师技术笔记

作者:shumeigang
来源链接:https://blog.csdn.net/shumeigang/article/details/93052619

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标签: Feign
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