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spring cloud应用

时间:2019-10-10 22:15:32      阅读:87      评论:0      收藏:0      [点我收藏+]

1、什么是注册中心

(1)就是首先有一个eureka server,服务的注册与发现的中心
(2)你如果写好了一个服务,就可以将其注册到eureka server上去
(3)然后别人的服务如果要调用你的服务,就可以从eureka server上查找你的服务所在的地址,然后调用

2、Eureka基本原理

(1)服务都会注册到eureka的注册表
(2)eureka有心跳机制,自动检测服务,故障时自动从注册表中摘除
(3)每个服务也会缓存euraka的注册表,即使eureka server挂掉,每个服务也可以基于本地注册表缓存,与其他服务进行通信
(4)只不过是如果eureka server挂掉了,那么无法发布新的服务了

实验步骤

(1)启动和发布一个eureka server,注册中心,web界面可以看到所有注册的服务
(2)写一个hello world服务,注册到eureka server上去

3、eureka server

(1)pom.xml

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>1.5.2.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>
</properties>

<dependencies>
	<!--eureka server -->
	<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-eureka-server</artifactId>
	</dependency>

	<!-- spring boot test-->
	<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>Dalston.RC1</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>

(2)Application

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

(3)application.yml

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
	  
(4)访问8761端口

4、eureka client

(1)pom.xml

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>1.5.2.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>
</properties>

<dependencies>
	<dependency>
		<groupId>org.springframework.cloud</groupId>
		<artifactId>spring-cloud-starter-eureka</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>Dalston.RC1</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>

(2)Application

@SpringBootApplication
@EnableEurekaClient
@RestController
public class SayHelloServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(SayHelloServiceApplication.class, args);
    }

    @Value("${server.port}")
    String port;
    @RequestMapping("/sayHello")
    public String home(@RequestParam String name) {
        return "hello, " + name + " from port:" +port;
    }

}

(3)application.yml

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
server:
  port: 8762
spring:
  application:
    name: service-say-hello

(4)查看eureka server界面

(5)http://localhost:8762/sayHello?name=leo

  

spring cloud应用

原文:https://www.cnblogs.com/sunliyuan/p/11650873.html

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