搭建注册服务提供者微服务

柔光的暖阳◎ 2023-07-08 09:25 5阅读 0赞

说明：本次主要完成将Spring Boot应用加入Eureka的服务治理体系(换句话说就是将一个微服务应用向服务注册中心发布自己)

1.修改pom.xml文件(增加Spring Cloud Eureka模块的依赖)

<?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>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.5.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.ml</groupId>
        <artifactId>hello-server</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>hello-server</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
            <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka</artifactId>
                <version>1.3.4.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    
        <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>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    </project>

2.新建HelloController类，创建/hello接口，通过注入DiscoveryClient对象，在日志中打印出服务的相关内容

@RestController
    public class HelloController { 
        private final Logger logger = LoggerFactory.getLogger(getClass());
    
        @Autowired
        private DiscoveryClient client;
    
        @RequestMapping(value = "/hello", method = RequestMethod.GET)
        public String index() { 
            List<String> service = client.getServices();
            //System.out.println("services:" + service.get(0));
            logger.info("services:" + service);
            return "hello world";
        }
    }

3.在主类中通过加入@EnableDiscoveryClient注解，激活Eureka中的DiscoveryClient实现(自动化配置，创建DiscoveryClient接口针对Eureka客户端的EnableDiscoveryClient实例)，才能实现上述Controller中对服务信息的输出。

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

4.最后需要在application.properties配置文件中添加以下内容

#配置服务器端口
    server.port=1112
    #服务命名
    spring.application.name=hello-server
    #指定服务注册中心地址
    eureka.client.serviceurl.defaultZone=http://localhost:1111/eureka/
    #ribbon.eureka.enabled=true