SpringBoot整合SpringCloud

SpringCloud 可以说是一门非常热门的技术，依赖于SpringBoot进行实现。cloud就像一个大管家，而SpringBoot 才是真正干活的人。且SpringBoot可以独自运行，不依赖于SpringCloud。本篇主要介绍SpringCloud中五大神兽里的两大神兽，eureka和rabbin，其中eureka 是重点，而rabbin只是简单使用了它的一个注解。

0，工程结构图

 

1，eureka 配置

①，pom.xml

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.12.RELEASE</version>
    </parent>

    <properties>
        <spring-cloud.version>Edgware.SR3</spring-cloud.version>
    </properties>

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

②，application.properties

#eueka 主机名
eureka.instance.hostname=eureka-service
#不注册自己
eureka.client.register-with-eureka=false
#获取服务
eureka.client.fetch-registry=false
#提供者和消费者的注册地址
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

server.port=8761

③，启用注册中心

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

//启用注册中心
@EnableEurekaServer
@SpringBootApplication
public class EurekaApplication {

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

2，provider配置

①，pom.xml

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.12.RELEASE</version>
    </parent>

    <properties>
        <spring-cloud.version>Edgware.SR3</spring-cloud.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>
    </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>

②，application.properties

server.port=8002
#服务名
spring.application.name=ticket-provider
#使用ip进行注册
eureka.instance.prefer-ip-address=true
#注册地址
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

③，定义服务

import org.springframework.stereotype.Service;

@Service
public class TicketService {

    public String buyTicket(){
        System.out.println("我是8002");
        return "《疯狂的石头》";
    }
}

④，提供服务

import com.example.provider.service.TicketService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TicketController {

    @Autowired
    private TicketService ticketService;

    @RequestMapping("/")
    public String index(){
        return ticketService.buyTicket();
    }
}

3，customer配置

①，pom.xml

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.12.RELEASE</version>
    </parent>

    <properties>
        <spring-cloud.version>Edgware.SR3</spring-cloud.version>
    </properties>

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

②，application.properties

server.port=8200

spring.application.name=ticket-customer
eureka.instance.prefer-ip-address=true
#注册地址
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

③，消费者配置

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

//开启发现服务
@EnableDiscoveryClient
@SpringBootApplication
public class CustomerApplication {

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

//    启用负载均衡，默认算法是轮询
    @LoadBalanced
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

④，消费者消费方法

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class CustomerController {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/")
    public String index(){
        String result = restTemplate.getForObject("http://ticket-provider/", String.class);

        return result;
    }
}

4，测试

①，启动eureka工程

②，启动提供者工程

③，启动消费者工程

④，最后会看到消费者和提供者都注册到了eureka中，并可以通过，消费接口访问服务者提供的服务，

并且使用了轮询的负载均衡策略