SpringCloud
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一、SpringCloud_eureka_server
1、导入依赖
<!--SpringBoot节点--> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <!--eureka依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix- eureka-server</artifactId> </dependency> <dependencyManagement> <dependencies> <!--springCloud依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Greenwich.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
2、配置application.yml文件
###应用名称 spring: application: name: eureka-server ###声明当前eurekaserver的端口号 server: port: 8888 ###配置eureka eureka: client: ###代表是否将自己注册到注册中心去 register-with-eureka: false ###表明自己是注册中心 fetch-registry: false ###配置地址 service-url: defaultZone: http://localhost:8888/eureka
3、创建启动类
package com.cloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @SpringBootApplication @EnableEurekaServer public class StartEurekaServer { public static void main(String[] args){ SpringApplication.run(StartEurekaServer.class,args); } }
4、实现效果如下
二、生产者与消费者
1、SpringCloud_eureka_provider(生产者项目)
(1)导入依赖
<!--SpringBoot节点--> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <!--eureka依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix- eureka-server</artifactId> </dependency> <dependencyManagement> <dependencies> <!--springCloud依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Greenwich.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
(2)配置application.yml文件
(3)创建启动类
package com.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class StratProvider {
public static void main(String[] args){
SpringApplication.run(StratProvider.class,args);
}
}
(4)创建Service层
package com.cloud.service; public interface IDoSomeService { public String doSome(); }
(5)创建ServiceImpl层
package com.cloud.service.impl; import com.cloud.service.IDoSomeService; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class IDoSomeServiceImpl implements IDoSomeService { @RequestMapping("/doSome") @Override public String doSome() { System.out.println("生产者提供"); return "eureka"; } }
2、SpringCloud_eureka_consumer(生产者项目)
(1)导入依赖
同生产者一样的依赖
(2)配置application.yml文件
(3)创建Controller层
package com.cloud.controller; import com.cloud.service.IDoSomeService; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import javax.annotation.Resource; @RestController public class ConsumerController { @Resource private RestTemplate restTemplate; @RequestMapping("/doSome") public String doSome(){ System.out.println("消费者提供"); return restTemplate.getForObject("http://
@RequestMapping("/doSome")
public String doSome(){
System.out.println("消费者提供");
return restTemplate.getForObject("http://localhost:8888/doSome",String.class);
}
/doSome",String.class); } }
(4)创建启动类
package com.cloud; import com.netflix.loadbalancer.IRule; import com.netflix.loadbalancer.RandomRule; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate; @SpringBootApplication @EnableEurekaClient @EnableFeignClients public class StratConsumer { public static void main(String[] args){ SpringApplication.run(StratConsumer.class,args); } @Bean @LoadBalanced //实现负载均衡 RestTemplate restTemplate(){ return new RestTemplate(); } }
(5)启动效果如下
三、实现负载均衡
1、更改Controller层的访问地址
2、启动类如下
package com.cloud; import com.netflix.loadbalancer.IRule; import com.netflix.loadbalancer.RandomRule; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import org.springframework.cloud.openfeign.EnableFeignClients; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate; @SpringBootApplication @EnableEurekaClient @EnableFeignClients public class StratConsumer { public static void main(String[] args){ SpringApplication.run(StratConsumer.class,args); } @Bean @LoadBalanced //实现负载均衡 RestTemplate restTemplate(){ return new RestTemplate(); } }
3、实现效果如下
勾选上此选项即可启动多个端口
生产者启动两个或两个以上端口访问
总共访问3此次,第一个端口走两次,第二个端口走一次(默认轮训机制)
4、指定负载均衡策略
四、Feign负载均衡策略
1、导入依赖
<!--导入feign依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>
2、创建Service层(生产者接口名称不可有下划线)
3、Controller层
package com.cloud.controller; import com.cloud.service.IDoSomeService; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate; import javax.annotation.Resource; @RestController public class ConsumerController { @RestController public class ConsumerController { /* @Resource private RestTemplate restTemplate;*/ @Resource private IDoSomeService iDoSomeService; @RequestMapping("/doSome") public String doSome(){ System.out.println("消费者"); return iDoSomeService.doSome(); } }
4、启动类
@SpringBootApplication @EnableEurekaClient @EnableFeignClients public class StratConsumer { public static void main(String[] args){ SpringApplication.run(StratConsumer.class,args); } }
5、实现效果如下
同样至少启动两个访问端口
总共访问3此次,第一个端口走两次,第二个端口走一次(轮训机制)
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