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一、背景
1.Feign是一个声明式的伪Http客户端,它使得写Http客户端变得更简单。使用Feign,只需要创建一个接口并注解。它具有可插拔的注解特性,可使用Feign 注解和JAX-RS注解。Feign支持可插拔的编码器和解码器。Feign默认集成了Ribbon,并和Eureka结合,默认实现了负载均衡的效果。
2.简而言之
2.1.Feign 采用的是基于接口的注解
2.2.Feign 整合了ribbon
3.我自己理解的就是服务与服务之间的调用用到的是feign,下面我就通过一个具体的小案例来讲解这个feign.
二、项目结构
三、项目中的各个配置
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>1.5.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo-serviceorder-fegin</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo-serviceorder-fegin</name>
<description>Demo project for Spring Boot</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.RC1</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>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
2.controller
@RestController
public class FeignMemberController {
@Autowired
private MemberFeign memberFeign;
@RequestMapping("/getFeignOrderByUserList")
public List<String> getFeignOrderByUserList() {
return memberFeign.getOrderByUserList();
}
}
3.service
@FeignClient("demo-service-member")
public interface MemberFeign {
@RequestMapping("/getMemberAll")
public List<String> getOrderByUserList();
}
4.application.yml
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8888/eureka/
server:
port: 8765
spring:
application:
name: demo-serviceorder-feign
4.启动类
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class DemoServiceorderFeginApplication {
public static void main(String[] args) {
SpringApplication.run(DemoServiceorderFeginApplication.class, args);
}
}
5.分别依次启动项目Eurka、项目demo-service-member、项目demo-serviceorder-feign、具体哪个项目可以参看我前一个博客:https://blog.csdn.net/chenmingxu438521/article/details/90514885
四、效果图
1.Eureka注册中心
2.服务间调用的结果数据
五、总结
希望能帮到你们,下几篇讲解,熔断,晚安,各位!!!