Eureka實現微服務的呼叫

1、版本

2、Eureka的註冊中心

 (1)、pom.xml

<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-server</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<!--版本控制  Dalston.SR3 ===》1.3.3.RELEASE  -->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR3</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	
	<dependencies>
		<!--與SpringCloud配置相關-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<!--Eureka的伺服器(註冊中心)-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka-server</artifactId>
		</dependency>
	</dependencies>


</project>

(2)、編寫啟動類

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
/*開啟Eureka的註冊中心*/
@EnableEurekaServer
public class ServerApp {

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

}

(3)、配置檔案(1、不去註冊中心註冊自己  2、不去註冊中心抓取服務檔案)

server:
  port: 8761
eureka:
  client:
    #不去註冊中心註冊自己(自己就是服務中心)
    register-with-eureka: false
    #不去註冊中心抓取服務檔案(自己就是服務中心)
    fetch-registry: false

(4)、啟動測試

   直接執行main

 

 

3、服務提供者

(1)、pom.xml

 

<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-police</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<!--定義版本-->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR3</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	<dependencies>
		<!--SpringCloud的配置-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<!--Eureka服務-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
	</dependencies>

</project>

(2)、編寫啟動類

 

package org.crazyit.cloud;

public class Police {

	private Integer id;
	private String name;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

package org.crazyit.cloud;

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

@SpringBootApplication
/*開啟Eureka客戶端*/
@EnableEurekaClient
public class PoliceServer {

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

}

(3)、配置檔案(1、註冊的服務名稱  2、註冊中心的地址)

spring:
  application:
    #Eureka服務名稱
    name: first-police
eureka:
  client:
    serviceUrl:
      #Eureka的註冊中心
      defaultZone: http://localhost:8761/eureka/

（4）、編寫服務

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;

/**
 * 服務提供者
 */
@RestController
public class PoliceController {

	@RequestMapping(value = "/call/{id}", method = RequestMethod.GET, 
			produces = MediaType.APPLICATION_JSON_VALUE)
	public Police call(@PathVariable Integer id) {
		Police p = new Police();
		p.setId(id);
		p.setName("angus");
		return p;
	}
}

(5)、啟動測試

 直接執行main

 

4、服務消費者

(1)、pom.xml

<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-person</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<!--定義版本-->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Dalston.SR3</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	<dependencies>
		<!--SpringCloud的配置-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		<!--Eureka-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<!--Ribbon-->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-ribbon</artifactId>
		</dependency>
	</dependencies>
	
</project>

(2)、編寫啟動類

package org.crazyit.cloud;

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

@SpringBootApplication
/*開啟Eureka的服務端*/
@EnableEurekaClient
public class PersonServer {

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

}

(3)、配置檔案(1、註冊的服務名稱  2、註冊中心的地址)

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.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestTemplate;

@Controller
/*載入RestTemplate的配置*/
@Configuration
public class TestController {
	
	@Bean
	@LoadBalanced
	public RestTemplate getRestTemplate() {
		return new RestTemplate();
	}

	@GetMapping("/router")
	@ResponseBody
	public String router() {
		RestTemplate tpl = getRestTemplate();
		//到註冊中心找服務並呼叫服務
		String json = tpl.getForObject("http://first-police/call/1", String.class);
		return json;
	}

}

（4）、編寫服務

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.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestTemplate;

@Controller
/*載入RestTemplate的配置*/
@Configuration
public class TestController {
	
	@Bean
	@LoadBalanced
	public RestTemplate getRestTemplate() {
		return new RestTemplate();
	}

	@GetMapping("/router")
	@ResponseBody
	public String router() {
		RestTemplate tpl = getRestTemplate();
		//到註冊中心找服務並呼叫服務
		String json = tpl.getForObject("http://first-police/call/1", String.class);
		return json;
	}

}

(5)、啟動測試

 http://localhost:8081/router