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