SpringCloud(一)_Eureka

Eureka构建服务器（server）

maven项目需要用到jar包，pom.xml文件如下

<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>org.crazyit.cloud</groupId>
	<artifactId>first-ek-server</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

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

</project>

　

resource目录新建application.yml文件

　　文件指定port

       修改配置指定这个Eureka是服务器端不需要注册

server:
 port: 8761
eureka :
 client :
  registerWithEureka: false
  fetchRegistry: false

　　

启动server文件

@SpringBootApplication：使用springboot一样的启动方式

@EnableEurekaServer指定这是一个Eureka的Server

package org.crazyit.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class FirstServer {

	public static void main(String[] args) {
		new SpringApplicationBuilder(FirstServer.class).run(args);

	}

}

　　

run上面的main方法

从Tomcat started on port(s): 8761 (http)可知，启动的端口是8761

输入：http://localhost:8761/ 找到server

如下（现在没有任何Eureka客户端或提供者注册这个server）

Eureka提供者（provider）

maven项目需要用到jar包，pom.xml文件如下

<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>org.crazyit.cloud</groupId>
	<artifactId>first-ek-service-provider</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
	</dependencies>
	
</project>

　　

resource目录新建application.yml文件

　　提供者的名字

　　主机的名字

　　指定注册哪个server

spring:
  application:
    name: first-service-provider
eureka:
  instance:
    hostname: localhost
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
logging:
  level:
    com.netflix: INFO

　　

      

启动server

@SpringBootApplication：使用springboot一样的启动方式

@EnableEurekaClient指定这是一个Eureka的client，需要去指定的server注册

package org.crazyit.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class FirstServiceProvider {

	public static void main(String[] args) {
		new SpringApplicationBuilder(FirstServiceProvider.class).run(args);
	}
}

　

run上面的main方法

输入：http://localhost:8761/ 找到server

如下（现在first-service-provider注册这个server）

　

编写controller类，为后面的invoker调用（person类自己写就行）

package org.crazyit.cloud;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class FirstController {
	
	@RequestMapping(value = "/person/{personId}", method = RequestMethod.GET, 
			produces = MediaType.APPLICATION_JSON_VALUE)
	public Person findPerson(@PathVariable("personId") Integer personId) {
		Person person = new Person(personId, "Crazyit", 30);
		return person;
	}
}

　　

Eureka调用者（invoker）

maven项目需要用到jar包，pom.xml文件如下

<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>org.crazyit.cloud</groupId>
	<artifactId>first-ek-service-invoker</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR1</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-ribbon</artifactId>
		</dependency>
	</dependencies>
</project>

　　

resource目录新建application.yml文件

　　指定调用者的port：9000

　　调用者的名字

　　主机的名字

　　指定注册哪个server

server:
  port: 9000
spring:
  application:
    name: first-service-invoker
eureka:
  instance:
    hostname: localhost
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

　　

启动server

@SpringBootApplication：使用springboot一样的启动方式

@EnableDiscoveryClient指定这是一个Eureka的DiscoveryClient（invoker），需要去指定的server注册

package org.crazyit.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class FirstInvoker {

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

　　

run上面的main方法

输入：http://localhost:8761/ 找到server

如下（现在first-service-invoker注册这个server）

写一个controller，该contoller去调用server中的client

package org.crazyit.cloud;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@Configuration
public class InvokerController {

	@Bean
	@LoadBalanced
	public RestTemplate getRestTemplate() {
		return new RestTemplate();
	}

	@RequestMapping(value = "/router", method = RequestMethod.GET, 
			produces = MediaType.APPLICATION_JSON_VALUE)
	public String router() {
		RestTemplate restTpl = getRestTemplate();
		// 鏍规嵁搴旂敤鍚嶇О璋冪敤鏈嶅姟
		String json = restTpl.getForObject(
				"http://first-service-provider/person/1", String.class);
		return json;
	}
}

通过http://localhost:9000/router访问上面的controller

发现成功调用了proviser的controller

三者关系如下