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