Idea下SpringCloud2实验（三、Eureka+Fegin服务消费）

2024-12-07 技术教程

一、创建SpringBoot的项目springcloud-eureka-customer，操作同上一篇

二、配置文件
1、pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.4.RELEASE</version> <relativePath/>  </parent> <groupId>com.jane</groupId> <artifactId>springcloud-eureka-customer</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springcloud-eureka-customer</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> <version>2.0.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-openfeign-core</artifactId> <version>2.0.2.RELEASE</version> </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> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>

2、启动文件

package com.jane.springcloudeurekacustomer;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.openfeign.EnableFeignClients;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.ComponentScans;@SpringBootApplication@EnableDiscoveryClient@EnableFeignClients(basePackages = "com.jane")@ComponentScan("com.jane")public class SpringcloudEurekaCustomerApplication { public static void main(String[] args) { SpringApplication.run(SpringcloudEurekaCustomerApplication.class, args); }}

3、application.properties

server.port=6020spring.application.name=springcloud-eureka-customereureka.client.service-url.defaultZone=http://127.0.0.1:6001/eureka/eureka.client.fetchRegistry=true

4、Fegin客户端TestFeginServiceClient

package com.jane.service;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;@FeignClient("springcloud-eureka-client-order")public interface TestFeginServiceClient { @RequestMapping(value = "/test", method = RequestMethod.GET) public String test();}

5、调用文件TestController

package com.jane.controller;import com.jane.service.TestFeginServiceClient;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class TestController { @Autowired TestFeginServiceClient testService; /** * 普通Restful * @return */ @RequestMapping(value = "/local", method = RequestMethod.GET) public String local() { return "本地local调用"; } /** * 利用Fegin客户端实现RPC调用order服务 * @return */ @RequestMapping(value = "/order/test", method = RequestMethod.GET) public String test(){ return testService.test(); }}

三、启动文件
1、服务中心

2、服务消费
2.1本地调用

2.2RPC调用

四、FeignClient本身集成了本地负载均衡Netflix的Ribbon，所以可以轻松实现负载均衡。
1、修改client-order端口号6011，多启动一个服务

2、消费服务多次调用结果如下：