Spring Cloud 实战 (二) 服务的注册与发现

旧城等待， 2022-02-02 23:17 223阅读 0赞

先创建一个最简单的 Spring Cloud 项目  
创建Spring Boot 项目 取名 SpringCloud-Main  
然后在 Maven 中添加 Spring Cloud

<dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Greenwich.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                    <exclusions>
                    </exclusions>
                </dependency>
            </dependencies>
        </dependencyManagement>

然后创建在 SpringCloud-Main 中创建一个 Module 子项目 取名 SpringCloud-eurekaserver  
同样在 Maven 中添加 Spring Cloud 且添加依赖：

<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-hystrix</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            
    	<dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Greenwich.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                    <exclusions>
                    </exclusions>
                </dependency>
            </dependencies>
        </dependencyManagement>

然后在 src/main/resources 中 修改配置文件：(yml格式)

server:
      port: 8761
      
    spring:
      application:
        name: eurekaserver
      profiles:
        active: dev
      cloud:
        inetutils:
          preferred-networks: 127.0.0.1
        client:
          ip-address: 127.0.0.1
          
    eureka:
      server:
        peer-node-read-timeout-ms: 3000 #微服务节点连接超时时间
        enable-self-preservation: true #是否开启自我保护 默认true
      instance:
        prefer-ip-address: true #是否以 IP 注册到注册中心 默认false
        instance-id: ${spring.cloud.client.ip-address}:${server.port} #注册限制的实例 ID
      client:
        registerWithEureka: true
        fetchRegistry: false
        healthcheck:
          enabled: true
        serviceUrl:
          defaultZone: http://127.0.0.1:8761/eureka/ #注册中心默认地址

然后在启动类添加注解 @EnableEurekaServer  
然后启动 SpringCloud-eurekaserver 项目[ http://localhost:8761][http_localhost_8761]  
效果图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjExODI4NA_size_16_color_FFFFFF_t_70]  
创建一个服务提供者（即客户端）注册到注册中心  
在 SpringCloud-Main 中创建一个 Module 子项目 取名 SpringCloud-client-A

<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-netflix-hystrix</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    	
    	<dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Greenwich.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                    <exclusions>
                    </exclusions>
                </dependency>
            </dependencies>
        </dependencyManagement>

同样修改配置文件：

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
          
    server:
      port: 8762
      
    spring:
      application:
        name: SpringCloud-client-A

启动类中@SpringCloudApplication 注解包含了 @EnableDiscoveryClient 注解，因此无需显式开启服务发现。  
效果图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjExODI4NA_size_16_color_FFFFFF_t_70 1]  
创建 controller ：

@RestController
    public class HelloController {
    
        @Value("${server.port}")
        private int port;
    
        @RequestMapping("index")
        public String index(){
            return "Hello World!,端口："+port;
        }
    }

访问[http://localhost:8762/][http_localhost_8762]  
效果图：  
![在这里插入图片描述][20190508125428152.png]

[上一篇 Spring Cloud 实战 (一) 简介 ][Spring Cloud _ _ _]

[下一篇 Spring Cloud 实战 (三) 服务网关 gateway][Spring Cloud _ _ _ gateway]

[git源码地址][git]

[http_localhost_8761]: http://localhost:8761
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjExODI4NA_size_16_color_FFFFFF_t_70]: /images/20220203/68e64f4eccb348268916ddcd6555c38c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjExODI4NA_size_16_color_FFFFFF_t_70 1]: /images/20220203/91506cc121c84b399869a8f78f955327.png
[http_localhost_8762]: http://localhost:8762/
[20190508125428152.png]: /images/20220203/e690b97be381493da22eb207ac28aa64.png
[Spring Cloud _ _ _]: https://blog.csdn.net/weixin_42118284/article/details/89949127
[Spring Cloud _ _ _ gateway]: https://blog.csdn.net/weixin_42118284/article/details/89949777
[git]: https://github.com/mars0520/Spring-Cloud