Ribbon【入门】

2019-10-18 00:00:00 ribbon 入门

公共依赖:

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/>
</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>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>

 

1、创建eureka-server注册中心工程

a、eureka-server工程pom依赖:

<!--加上上面的公共依赖-->

<
dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>

 

b、eureka-server启动类:

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

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

 

c、eureka-server工程配置文件:eureka-server\src\main\resources\bootstrap.yml

server:
  port: 8888
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

 

d、启动注册中心

mvn spring-boot:run

 

2、创建demo-client服务工程

a、demo-client工程pom配置:

<!--加上上面的公共依赖-->

<
dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>

 

b、demo-client启动类:

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

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

 

c、demo-client工程配置文件:demo-client\src\main\resources\bootstrap.yml

server:
  port: 7070
spring:
  application:
    name: client
eureka:
  client:
    serviceUrl:
      defaultZone: http://${eureka.host:127.0.0.1}:${eureka.port:8888}/eureka/
  instance:
    prefer-ip-address: true

 

d、编写测试接口:

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 测试API
 */
@RestController
public class TestController {

    @GetMapping("/testApi")
    public String testApi(Integer a, Integer b, HttpServletRequest request) {
        return " From Port: " + request.getServerPort() + ", Result: " + (a + b);
    }
}

 

e、启动工程

mvn spring-boot:run 

mvn spring-boot:run -Dserver.port=7171

启动了2个工程实例,一个端口是7070,一个是7171

 

3、创建demo-ribbon客户端工程 

a、demo-ribbon工程pom依赖:

<!--加上上面的公共依赖-->

<
dependencies> <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-eureka-client</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>

 

b、demo-ribbon工程启动类:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
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
public class RibbonLoadbalancerApplication {

    public static void main(String[] args) {
        SpringApplication.run(RibbonLoadbalancerApplication.class, args);
    }
    
   //声明该RestTemplate用于负载均衡 @Bean @LoadBalanced
public RestTemplate restTemplate() { return new RestTemplate(); } }

 

c、编写一个测试接口:

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

@RestController
public class TestController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/testApi")
    public String testApi(Integer a, Integer b) {
     //使用RestTemplate调用demo-client工程暴露的测试API接口 String result
= restTemplate.getForObject("http://CLIENT/testApi?a=" + a + "&b=" + b, String.class); System.out.println(result); return result; } }

 

d、demo-ribbon工程配置文件:demo-ribbon\src\main\resources\bootstrap.yml

spring:
  application:
    name: ribbon-loadbalancer
server:
  port: 7777
eureka:
  client:
    serviceUrl:
      defaultZone: http://${eureka.host:127.0.0.1}:${eureka.port:8888}/eureka/
  instance:
    prefer-ip-address: true

 

e、启动demo-ribbon工程:

mvn spring-boot:run

 

4、访问 localhost:7777/testApi?a=2019&=2020

《Ribbon【入门】》

从结果可以看到这次访问的是7171端口服务。

从下面的控制台输出可以看出,ribbon在做负载均衡的时候,默认使用的是轮询的方式!

《Ribbon【入门】》

 

 入门成功!!!

    原文作者:KingJames、
    原文地址: https://www.cnblogs.com/idoljames/p/11687359.html
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。

相关文章