spring cloud实例Dome详细搭建（二）

你的名字 2023-02-18 08:00 4阅读 0赞

# 详解搭建spring cloud的实例Demo，跟着一步一步走，肯定可以的 #

## 直接跟上上一章 继续搭建 ##

**配置中心（config）， 熔断器（hystrix），（负载均衡）ribbon**  
[GitHub代码地址][GitHub]

--------------------

## 配置中心（config） ##

*  **1.在父目录下创建子项目，方式和上一章一致（普通maven项目）**![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70]
 *  **2.导入所需依赖**

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</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-config-server</artifactId>
            </dependency>
        </dependencies>

*  **3.配置**

server:
      port: 1299
    eureka:
      client:
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka
      instance:
        prefer-ip-address: true
    spring:
      application:
        name: CONFIG-SERVER
      cloud:
        config:
          server:
            git:
              uri: https://github.com/wl1006/test.git    #git文件地址
              username: 1006wanglong@gmail.com  		 #Github账号
              password: xxxxxxxx						 #GitHub账号密码

**GitHub文件预览，如要实践，则需在GitHub上创建一个仓库**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 1]  
**文件内容**

spring:
      profiles:
        active:
          - dev
    ---
    server:
      port: 3355
    spring:
      application:
        name: MICRO-SERVER-DEV
      profiles: dev #开发环境
    ---
    server:
      port: 3356
    spring:
      application:
        name: MICRO-SERVER-TEST
      profiles: test #测试环境

*  **创建启动类**

@SpringBootApplication
    @EnableEurekaClient
    @EnableConfigServer //启动配置中心服务
    public class Application_Config {
        public static void main(String[] args) {
            SpringApplication.run(Application_Config.class);
        }
    }

*  **启动测试，是否能拿到配置**  
    测试地址（ip根据配置）：  
    http://127.0.0.1:1299/application/dev  
    http://127.0.0.1:1299/application/test
 *  **测试结果（因为我安装了json格式化插件，原为json字符串）**  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 2]
 *  **其他项目从配置中心获取配置**  
    为保持原结构，重新建一个项目进行测试  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 3]  
    **配置pom.xml**

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</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-netflix-eureka-client</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-config</artifactId>
            </dependency>
        </dependencies>

**配置文件(注意要使用配置中心加载配置，配置文件名为 bootstrap.yml)**

spring:
      cloud:
        config:
          uri: http://127.0.0.1:1299 	#配置服务器
          label: master 				#分支
          name: application 			#github上面名称
          profile: dev 					#环境
    eureka:
      client:
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka  #告诉服务提供者要把服务注册到哪儿
      instance:
        prefer-ip-address: true #显示客户端真实ip

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 4]  
**启动类**

@SpringBootApplication
    @EnableEurekaClient
    public class Application_Config_Provider {
        public static void main(String[] args){
            SpringApplication.run(Application_Config_Provider.class);
        }
    }

**服务提供**

@RestController
    @RequestMapping("/config")
    public class HelloController {
    
        @GetMapping("/hello")
        public String index() {
            return "我是一个数据！";
        }
    }

**启动项目，因为配置文件中选择的是dev环境，所有端口和服务名称则为**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 5]  
**端口：3355**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 6]  
**服务名：MICRO-SERVER-DEV**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 7]  
**将服务添加到网关，网关配置**

server:
      port: 9527
    spring:
      application:
        name: ZUUL-SERVER
    eureka:
      client:
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka
    zuul:
      routes:
        provider.serviceId: TEST-PROVIDER
        provider.path: /test/**  #匹配指定的路径，资源匹配的路径才会拦截，转发
        configProvider.serviceId: MICRO-SERVER-DEV	#新增
        configProvider.path: /config-provide/**  	#新增
      ignored-services: "*"      #忽略直接使用服务名访问  *忽略所有的
      prefix: /server            #统一给访问前缀

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 8]  
**至此，配置中心就基本配置完毕，测试的项目和上一个服务提供者效果一致，只是配置的获取方式是从配置中心获取**

## ribbon ##

ribbon主要是做负载均衡，要做负载均衡就要有多个服务提供者，在消费者调用时进行负载均衡。

*  **创建第二个服务提供者**  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 9]  
    **配置依赖和原来提供者一致（拷贝server-provider依赖，controller，配置文件）**  
    **唯一修改（配置文件application.yml中的端口更改，其他不要改）**

server:
      port: 8002		#更改
    spring:
      application:
        name: TEST-PROVIDER 
    eureka:
      client:
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka #注册到Eureka的地址

**项目结构**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 10]  
**在server-provider2的服务提供中修改一下数据，方便测试区分**  
**server-provider的controller：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 11]  
**server-provider2的controller：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 12]  
**启动测试**  
![在这里插入图片描述][20200616124700681.png]  
![在这里插入图片描述][20200616124720658.png]  
**两个服务提供者就准备好了**

*  **创建一个消费者进行负载均衡调用**  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 13]  
    添加依赖：

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
        </dependencies>

**启动类：**

**controller（注意URL，ip端口换为服务名称）**

@RestController
    @RequestMapping("consumer")
    public class ConsumerRibbonController {
    
        @Autowired
        private RestTemplate restTemplate;
    
        private final String URL = "http://TEST-PROVIDER/provider/get";
    
        @GetMapping("get")
        public String get() {
            String data = restTemplate.getForObject(URL, String.class);
            return data;
        }
    }

**配置文件**

server:
      port: 9003
    eureka:
      client:
        registerWithEureka: false #不注册到Eureka,不在注册中心显示
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka

**测试(轮询策略)：**  
![在这里插入图片描述][20200616142311185.gif]  
**更改负载均衡策略**

@SpringBootApplication
    @EnableEurekaClient
    public class Application_Ribbon {
        public static void main(String[] args) {
            SpringApplication.run(Application_Ribbon.class);
        }
    
        @Bean
        @LoadBalanced //开启负载均衡的功能
        public RestTemplate getRestTemplate() {
            return new RestTemplate();
        }
    
        //修改默认的负载均衡策略
        @Bean
        public IRule myRule() {
            //随机策略
            return new RandomRule();
        }
    }

**测试(随机策略)**  
![在这里插入图片描述][20200616142557639.gif]

--------------------

## 熔断器（hystrix） ##

*  **创建一个服务器提供者，模拟业务服务**  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 14]  
    **依赖**

**配置**

server:
      port: 8004
    spring:
      application:
        name: TEST-HYSTRIX-PROVIDER   #服务名称
    eureka:
      client:
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka #注册到Eureka的地址

**启动类**

@SpringBootApplication
    @EnableEurekaClient
    public class Application_Hystrix_Provider {
        public static void main(String[] args) {
            SpringApplication.run(Application_Hystrix_Provider.class);
        }
    }

**controller（模拟业务，如果num等于123，则判定为失败）**

@RestController
    @RequestMapping("provider")
    public class HystrixProviderController {
    
        @GetMapping("get/{num}")
        public String get(@PathVariable("num") Integer num) {
            if (num == 123) {
                throw new RuntimeException("FAILED");
            }
            return num + "==SUCCEED";
        }
    }

**测试**  
![在这里插入图片描述][20200616144146967.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 15]

*  **创建一个基于fegin的消费者**  
    **依赖**

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</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>
        </dependencies>

**配置**

server:
      port: 9004
    eureka:
      client:
        registerWithEureka: false #不注册到Eureka,不在注册中心显示
        service-url:
          defaultZone: http://127.0.0.1:7001/eureka
    feign:
      hystrix:
        enabled: true #开启熔断支持

**基本结构**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0NTc1Njgw_size_16_color_FFFFFF_t_70 16]  
**fegin接口**

//添加一个后备工厂，在失败时使用
    @FeignClient(value = "TEST-HYSTRIX-PROVIDER", fallbackFactory = ProviderClientFactory.class)
    @RequestMapping("provider")
    public interface ProviderClient {
    
        @GetMapping("get/{num}")
        public String get(@PathVariable("num") String num);
    }

**后备工厂**

@Component
    public class ProviderClientFactory implements FallbackFactory<ProviderClient> {
    
        @Override
        public ProviderClient create(Throwable cause) {
            return new ProviderClient() {
                @Override
                public String get(String num) {
                    return "Feign调用失败";
                }
            };
        }
    }

**启动类**

@SpringBootApplication
    @EnableEurekaClient
    @EnableFeignClients(basePackages = "com.wlg.hystrix.service")
    public class Application_Hystrix_Consumer {
        public static void main(String[] args) {
            SpringApplication.run(Application_Hystrix_Consumer.class);
        }
    }

**controller**

@RestController
    @RequestMapping("consumer")
    public class HystrixConsumerController {
    
        @Autowired
        private ProviderClient providerClient;
    
        @GetMapping("get/{num}")
        public String get(@PathVariable("num") String num) {
            String data = providerClient.get(num);
            return data;
        }
    }

**测试**  
![在这里插入图片描述][20200616151349183.png]  
![在这里插入图片描述][20200616151436892.png]  
hystrix就会在调用服务失败时，进行熔断，返回托底数据，避免了请求阻塞！

[GitHub]: https://github.com/wl1006/Spring-Cloud-Demo.git
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