(4)springcloud创建服务消费者（Ribbon）

待我称王封你为后i 2023-05-29 05:07 3阅读 0赞

1.创建hello-spring-cloud-web-admin-ribbon

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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <parent>
            <groupId>com.itheima</groupId>
            <artifactId>hello-spring-cloud-dependencies</artifactId>
            <version>1.0.0-SNAPSHOT</version>
            <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath>
        </parent>
    
        <artifactId>hello-spring-cloud-web-admin-ribbon</artifactId>
        <packaging>jar</packaging>
    
        <name>hello-spring-cloud-web-admin-ribbon</name>
        <inceptionYear>2019</inceptionYear>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            </dependency>
            
    
            
            <dependency>
                <groupId>net.sourceforge.nekohtml</groupId>
                <artifactId>nekohtml</artifactId>
            </dependency>
    
           
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <mainClass>com.itheima.hello.spring.cloud.web.admin.ribbon.WebAdminRibbonApplication</mainClass>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

3.通过@EnableDiscoveryClient注解注册到服务中心

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

4.application.yml

spring:
      application:
        name: hello-spring-cloud-web-admin-ribbon
      thymeleaf:
        cache: false
        mode: LEGACYHTML5
        encoding: UTF-8
        servlet:
          content-type: text/html
    
    server:
      port: 8764
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka

5.Configuration

配置注入RestTemplate的Bean，并通过@LoadBalanced注解标明开启负载均衡功能

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.client.RestTemplate;
    
    
    
    @Configuration
    public class RestTemplateConfiguration {
    
        @Bean
        @LoadBalanced
        public RestTemplate restTemplate() {
            return new RestTemplate();
        }
    }

将上一篇 的8763端口号改成8762 再起一个服务

![20191104140630411.png][]

刷新Eureka

![20191104140644133.png][]

6.创建测试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 AdminService {
    
        @Autowired
        private RestTemplate restTemplate;
    
      
        public String sayHi(String message) {
            return restTemplate.getForObject("http://hello-spring-cloud-service-admin/hi?message=" + message, String.class);
        }
    
        
    }

7.创建controller调用测试的service

import com.itheima.hello.spring.cloud.web.admin.ribbon.service.AdminService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    
    
    @RestController
    public class AdminController {
    
        @Autowired
        private AdminService adminService;
    
        @GetMapping("/hi")
        public String sayHi(String message) {
            return adminService.sayHi(message);
        }
    }

8.浏览器 刷新可以看到一会访问8762 一会儿访问8763 实现负载均衡

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70 1][]

此时的Eureka

![20191104141659994.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70 2][]

项目结构：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70 3][]

[20191104140630411.png]: https://img-blog.csdnimg.cn/20191104140630411.png
[20191104140644133.png]: https://img-blog.csdnimg.cn/20191104140644133.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191104141459521.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191104141515717.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg==,size_16,color_FFFFFF,t_70
[20191104141659994.png]: https://img-blog.csdnimg.cn/20191104141659994.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191104141747399.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191104152424307.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lhbnlmMjAxNg==,size_16,color_FFFFFF,t_70