spring cloud feign demo

1. 工程结构

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2. 父工程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>2.2.2.RELEASE</version><relativePath/></parent><groupId>com.anycode</groupId><artifactId>springcloud-lk</artifactId><version>1.0-SNAPSHOT</version><modules><module>springcloud-api</module><module>springcloud-provider-user-8001</module><module>springcloud-provider-user-8002</module><module>springcloud-consumer-user-feign</module></modules><!--打包方式--><packaging>pom</packaging><properties><java.version>1.8</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><spring.cloud.version>Hoxton.SR1</spring.cloud.version><spring-cloud-alibaba-dependencies.version>2.1.1.RELEASE</spring-cloud-alibaba-dependencies.version><junit.version>4.12</junit.version><log4j.version>1.2.17</log4j.version><lombok.version>1.16.18</lombok.version></properties><dependencyManagement><dependencies><!--springCloud的依赖--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring.cloud.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>${spring-cloud-alibaba-dependencies.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${lombok.version}</version></dependency></dependencies></dependencyManagement></project>

3. springcloud-api 模块只是提供一个实体

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4. springcloud-provider-user-8001 服务提供者模块

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><parent><artifactId>springcloud-lk</artifactId><groupId>com.anycode</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>springcloud-provider-user-8001</artifactId><version>0.0.1-SNAPSHOT</version><dependencies><dependency><groupId>com.anycode</groupId><artifactId>springcloud-api</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--nacos客户端--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!--热部署工具--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId></dependency></dependencies></project>

@RestController
@RequestMapping("/user")
public class UserController {@GetMapping("/{id}")public User getUser(@PathVariable("id") int id) {System.out.println("call provide-user-8001");return new User("Anycode", 18, "anycode@163.com", "北京");}
}

@SpringBootApplication
@EnableDiscoveryClient
public class SpringcloudProviderUser8001 {public static void main(String[] args) {SpringApplication.run(SpringcloudProviderUser8001.class, args);}}

5. springcloud-provider-user-8002

与springcloud-provider-user-8001 完全一样, 用于启动两个服务测试负载均衡.

6. springcloud-consumer-user-feign

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><artifactId>springcloud-lk</artifactId><groupId>com.anycode</groupId><version>1.0-SNAPSHOT</version></parent><artifactId>springcloud-consumer-user-feign</artifactId><version>0.0.1-SNAPSHOT</version><dependencies><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></dependency><!--nacos客户端--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><dependency><groupId>com.anycode</groupId><artifactId>springcloud-api</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies></project>

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Feign客户端开发, 照猫画虎, 和Controller异曲同工.

@FeignClient(name = "springcloud-provider-user", path = "/user")
public interface UserService {@GetMapping("/{id}")public User getUser(@PathVariable("id") int id);
}

启动类

@SpringBootApplication
@EnableDiscoveryClient //注册服务
@EnableFeignClients // 开启Feign
public class SpringcloudConsumerUserFeign {public static void main(String[] args) {SpringApplication.run(SpringcloudConsumerUserFeign.class, args);}}