Spring Cloud 服务发布与调用

2024-12-29 技术教程

1. 发布服务引入相关依赖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>2.1.3.RELEASE</version> <relativePath/>  </parent> <groupId>com.zws.cloud</groupId> <artifactId>Eurka-Producer</artifactId> <version>0.0.1-SNAPSHOT</version> <name>Eurka-Producer</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Greenwich.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>配置Eureka Server地址 application.yml

server: port: 8080eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/spring: application: name: Eureka-Producer发布一个服务，其实就是一个Http接口，如下：

package com.zws.cloud.producer;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;/** * @Author wensh.zhu * @Date 2019/2/16 19:33 */@RestControllerpublic class HelloController { @GetMapping("/hello") public String hello() { return "hello"; }}启动 package com.zws.cloud.producer;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class EurekaProducerApplication { public static void main(String[] args) { SpringApplication.run(EurekaProducerApplication.class, args); }}2. 调用服务依赖配置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>2.1.3.RELEASE</version> <relativePath/>  </parent> <groupId>com.zws.cloud</groupId> <artifactId>Eurka-Producer</artifactId> <version>0.0.1-SNAPSHOT</version> <name>Eurka-Producer</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Greenwich.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <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-ribbon</artifactId> </dependency>  <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>启用Ribbon负载均衡以及Feign接口注入，application.yml

server: port: 8088eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/spring: application: name: Eureka-Consumer定义Feign客户端以及熔断回调

package com.zws.cloud.consumer;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;/** * @Author wensh.zhu * @Date 2019/2/16 15:14 */@FeignClient(value = "Eureka-Producer", fallbackFactory = HelloClientFallbackFactory.class)public interface HelloClient { @GetMapping("/hello") String hello();}package com.zws.cloud.consumer;import feign.hystrix.FallbackFactory;import org.springframework.stereotype.Component;/** * @Author wensh.zhu * @Date 2019/2/16 16:12 */@Componentpublic class HelloClientFallbackFactory implements FallbackFactory<String>, HelloClient { @Override public String create(Throwable throwable) { return this.hello(); } @Override public String hello() { return ""; }}

@FeignClient(value = "Eureka-Producer", fallbackFactory = HelloClientFallbackFactory.class)其中Eurka-Producer为服务提供方的实例名称（spring.application.name）

启用Feign接口以及调用

package com.zws.cloud.EurkaProducer;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.openfeign.EnableFeignClients;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestController@EnableFeignClients@SpringBootApplicationpublic class EurkaProducerApplication { @Resource private HelloFeign helloFeign; public static void main(String[] args) { SpringApplication.run(EurkaProducerApplication.class, args); } @GetMapping("/hello") public String hello() { return helloFeign.hello(); }}3. 总结

服务发布主要涉及如下三个方面：

配置Eureka Server地址：

## 多个以逗号隔开eureka:client:serviceUrl: defaultZone: http://peer1:8761/eureka/引入Eureka Client依赖

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency>定义普通的Http接口

服务调用：

引入三个依赖：

<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-ribbon</artifactId></dependency><dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId></dependency>配置Eureka Server：

eureka: client: serviceUrl: defaultZone: http://localhost:8762/eureka/定义FeignClient接口以及失败的回调启动类添加@EnableFeignClients注解

@EnableFeignClients会把第三步定义的接口注入Spring上下文中，然后使用的时候直接注入即可。