(一)服务的注册于发现(eureka);
Eureka Server: 服务注册中心，负责服务列表的注册、维护和查询等功能
在Idea里，新建项目，选择Spring initializer.
下面的pom
<?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>
<groupId>com.example</groupId>
<artifactId>spring-clound-eureka-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-clound-eureka-demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.M3</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
配置properties文件参数;
server.port=8882
#域名
eureka.instance.hostname=localhost
#禁用 Eureka的客户端注册行为
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
#eureka注册中心服务地址
eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/
在启动类上添加注解@EnableEurekaServer
// @EnableEurekaServer 代表启动注册服务中心
@EnableEurekaServer
@SpringBootApplication
public class SpringCloundEurekaDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringCloundEurekaDemoApplication.class, args);
}
}
启动项目,打开连接 http://localhost:8882
二.创建一个服务提供者(Eureka-client)
服务提供方，同时也是一个Eureka Client，负责将所提供的服务向Eureka Server进行注册、续约和注销等操作。注册时所提供的主要数据包括服务名、机器ip、端口号、域名等，从而能够使服务消费方能够找到
Eureka服务器我们已经编写好了，接下来我们就可以编写一个Eureka的客户端了。这个客户端可能是一个服务提供者，也可能是一个服务消费者，甚至两者都是。
我们先编写一个简单的Eureka Client
在Idea里，新建项目，选择Spring initializ.
下面的pom
<?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>
<groupId>com.example</groupId>
<artifactId>spring-clound-ribbon-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-clound-ribbon-example</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.M3</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>1.4.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<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>
<scope>test</scope>
</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
配置yml文件参数;（换下配置方式）
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8882/eureka/
server:
port: 8883
spring:
application:
name: service-hello
在启动类上添加注解@EnableEurekaClient
// @ EnableEurekaClient 表示申明自己是一个发服务提供者;
@EnableEurekaClient
@SpringBootApplication
public class SpringCloundEurekaClientExampleApplication {
public static void main(String[] args) {
SpringApplication.run(SpringCloundEurekaClientExampleApplication.class, args);
}
}
创建conroller
@RestController
public class HelloController {
@Value("${server.port}")
String port;
@Value("${spring.application.name}")
String name;
@RequestMapping("/index")
public String index() {
return "服务提供者client:" + name + "服务端口：" + port;
}
}
启动项目
然后我们再来看一下服务注册中心;就会看到，已经注册了一个服务提供者;
为了接下来测试Ribbon负载
我们将client的配置文件属性注册的端口改为8884;;然后在IDEA把该服务再启动一个实例
（把single instance only勾选去掉）
回到服务中心，已经有两个client了
原文地址：https://www.cnblogs.com/skyLogin/p/10002472.html
时间： 2024-08-02 15:52:37