SpringCloud-创建服务消费者-Ribbon方式(附代码下载)

我会带着你远行 2023-10-11 13:47 28阅读 0赞

## 场景 ##

SpringCloud-服务注册与实现-Eureka创建服务注册中心(附源码下载)：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/102535957][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102535957]

SpringCloud-服务注册与实现-Eureka创建服务提供者(附源码下载)：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/102558004][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102558004]

在上面已经实现服务注册中心和服务提供者的基础上，再创建服务消费者，即使用上面提供服务的一方。

注：

博客：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
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## 实现 ##

参考上面构建项目的方式，依次建立目录hello-spring-cloud-web-admin-ribbon目录以及在

目录下新建pom.xml，并将其托管。然后新建src/main/java目录和src/main/resources目录并分别进行目录设置。

然后在java下新建包，包下新建启动类，在resources下新建配置文件application.yml。

完成后的目录为：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

pom.xml代码：

<?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>com.badao</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>
        <url>https://blog.csdn.net/badao_liumang_qizhi</url>
        <inceptionYear>2019-Now</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.funtl.hello.spring.cloud.web.admin.ribbon.WebAdminRibbonApplication</mainClass>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    </project>

注：

这里的parent标签要与上面的统一的依赖管理对应起来。

要修改指定的程序入口类为自己相应的路径。

然后应用启动类的代码：

package com.badao.hello.spring.cloud.web.admin.ribbon;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class WebAdminRibbonApplication {
        public static void main(String[] args) {
            SpringApplication.run(WebAdminRibbonApplication.class, args);
        }
    }

注：

通过 @EnableDiscoveryClient 注解注册到服务中心

然后是配置文件代码：

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/

注：

1.服务注册与发现是根据上面的name去寻找。

2.port表示端口号。

3.serviceURL设置eureka的地址，与上面创建服务注册中心时的URL对应。

然后新建配置类注入RestTemplte的Bean并通过@LoadBalanced 注解表明开启负载均衡功能。

在包下新建config包并新建RestTemplateConfiguration配置类

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

package com.badao.hello.spring.cloud.web.admin.ribbon.config;
    
    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();
        }
    }

为了体现出负载均衡效果，我们要启动两台service-admin，即启动两个服务提供者。

我们先启动服务注册中心Eureka服务8761端口，再以8762端口启动一个服务提供者，然后点击Run-Edit Configuration，将启动单实例去掉。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

然后修改服务提供者的配置文件中端口号为8763，再启动一个服务提供者。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

然后我们在Eureka的界面即：[http://localhost:8761/][http_localhost_8761]刷新就可以看到两个服务提供者。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

消费者要想实现负载均衡的效果，应该一会访问8762的服务提供者，一会访问8763的服务提供者。

所以我们在服务消费者配置了@LoadBalanced即可实现。

既然是消费服务者，所以要新建调用服务的controller和service

在ribbon包下新建service包，包下新建AdminService

package com.badao.hello.spring.cloud.web.admin.ribbon.service;
    
    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);
        }
    }

这里使用的是Ribbon+RestTemlate进行服务的调用，使用RestTeplate的getForObject()方法。其中url参数就是

上面服务提供者的配置文件中的name。

然后再新建controller包，包下新建AdminController

package com.badao.hello.spring.cloud.web.admin.ribbon.controller;
    
    import com.badao.hello.spring.cloud.web.admin.ribbon.service.AdminService;
    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.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class AdminController {
    
        @Autowired
        private AdminService adminService;
    
        @RequestMapping(value = "hi", method = RequestMethod.GET)
        public String sayHi(@RequestParam String message) {
            return adminService.sayHi(message);
        }
    }

然后运行当前服务消费者的启动程序。

打开浏览器输入：

[http://localhost:8764/hi?message=badaoXiaofeizhe][http_localhost_8764_hi_message_badaoXiaofeizhe]

![20191014222209843.gif][]

## 代码下载 ##

[https://download.csdn.net/download/badao\_liumang\_qizhi/11860102][https_download.csdn.net_download_badao_liumang_qizhi_11860102]

此时的架构

一个服务注册中心，Eureka Server，端口号为：8761  
service-admin 工程运行了两个实例，端口号分别为：8762，8763  
web-admin-ribbon 工程端口号为：8764  
web-admin-ribbon 通过 RestTemplate 调用 service-admin 接口时因为启用了负载均衡功能故会轮流调用它的 8762 和 8763 端口

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102535957]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102535957
[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102558004]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102558004
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191014221958347.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191014222040498.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191014222059846.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191014222109749.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[http_localhost_8761]: http://localhost:8761/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20191014222119391.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[http_localhost_8764_hi_message_badaoXiaofeizhe]: http://localhost:8764/hi?message=badaoXiaofeizhe
[20191014222209843.gif]: https://img-blog.csdnimg.cn/20191014222209843.gif
[https_download.csdn.net_download_badao_liumang_qizhi_11860102]: https://download.csdn.net/download/badao_liumang_qizhi/11860102