Spring Cloud 快速入门

 Spring Cloud快速入门

代码地址：

https://gitee.com/gloryxu/spring-cloud-test

EureKa:服务注册中心

添加依赖

     <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

        </dependency>

开启Eureka Server

@EnableEurekaServer

@SpringBootApplication

public class EurekaApplication {

    public static void main(String[] args) {

        SpringApplication.run(EurekaApplication.class, args);

    }

}

配置

#设置tomcat服务端口号

server.port=

# 本地调试环境下关闭自我保护机制

eureka.server.enable-self-preservation=false

# 清理间隔时间，单位为毫秒

eureka.server.eviction-interval-timer-in-ms=

#设置服务名称

spring.application.name=eureka-service

eureka.instance.hostname=localhost

#注册中心不需要注册自己

eureka.client.register-with-eureka=false

#注册中心不需要去发现服务

eureka.client.fetch-registry=false

#设置服务注册中心的URL

eureka.client.serviceUrl.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka

启动成功

2.创建一个服务提供者

添加依赖

<dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

@EnableDiscoveryClient // 声明这是一个Eureka Client

@SpringBootApplication

public class Server1Application {

    public static void main(String[] args) {

        SpringApplication.run(Server1Application.class, args);

    }

}

添加配置

server.port=

#设置服务名

spring.application.name=hello-service

#设置服务注册中心的URL，本服务要向该服务注册中心注册自己

eureka.client.serviceUrl.defaultZone=http://localhost:8101/eureka

添加Controller

@RestController

public class HelloController {

    Logger logger = LoggerFactory.getLogger(HelloController.class);

    @RequestMapping("/hello")

    public String hello() {

        return "hello";

    }

}

启动注册成功

3.创建一个消费者

添加依赖

    <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-openfeign</artifactId>

        </dependency>

LoadBalanced 方式可实现负载均衡

@EnableFeignClients

@EnableDiscoveryClient

@SpringBootApplication

public class ConsumerApplication {

    @Bean

    @LoadBalanced

    public RestTemplate restTemplate() {

        return new RestTemplate();

    }

    public static void main(String[] args) {

        SpringApplication.run(ConsumerApplication.class, args);

    }

}

添加配置

server.port=

spring.application.name=hello-consumer

eureka.client.serviceUrl.defaultZone=http://localhost:8101/eureka/

声明Feign方式 ，value为注册的服务名

@FeignClient(value = "hello-service")

public interface HelloService {

    @RequestMapping(value = "/hello")

    String hello();

}

以下以两种方式调用服务提供者，一种是以Rest方式，另一种以Feign方式

@RestController

public class ConsumerController {

    Logger logger = LoggerFactory.getLogger(ConsumerController.class);

    @Autowired

    private RestTemplate restTemplate;

    @Autowired

    HelloService helloService;

    @GetMapping("/getserver")

    public String getserver() {

        String xx=restTemplate.getForObject("http://hello-service/hello", String.class);

        return "consumer finish result:"+xx;

    }

    @GetMapping("/gettest")

    public String gettest(){

        return helloService.hello();

    }

}

启动

4.创建Zuul路由

添加依赖

<dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>

        </dependency>

加入注解，以便注册到注册中心

@EnableZuulProxy

@SpringBootApplication

public class ZuulApplication {

    public static void main(String[] args) {

        SpringApplication.run(ZuulApplication.class, args);

    }

}

配置路由，以下是以服务的方式调用

spring.application.name=eureka-zuul

server.port=

zuul.routes.hello-service.path=/hello-service/**

zuul.routes.hello-service.serviceId=hello-service

eureka.client.serviceUrl.defaultZone=http://localhost:8101/eureka/

启动 注册成功，调用成功