【springCloud基础篇-5】SpringCloud的服务提供与调用(Feign方式调用)之创建消费者(接上篇)，附带讲解说明

柔情只为你懂 2023-06-11 02:20 1阅读 0赞

demo代码地址：[https://download.csdn.net/download/qq\_33333654/12014918][https_download.csdn.net_download_qq_33333654_12014918]

上篇地址：[https://blog.csdn.net/qq\_33333654/article/details/102782319][https_blog.csdn.net_qq_33333654_article_details_102782319]

环境：

IDEA

maven 3.0

spirngboot1.5.3

注：本人无法在springboot2.2.0中使用EnableFeignClients，如果哪位大佬会请评论我，非常感谢。

注:该篇文章是建立在注册中心高可用博客基础上写的。地址：[https://blog.csdn.net/qq\_33333654/article/details/102636388][https_blog.csdn.net_qq_33333654_article_details_102636388]

请先启动注册中心以及服务提供者(即上篇文章的项目)！！！！

Feign是一个声明式Web Service客户端。使用Feign能让编写Web Service客户端更加简单, 它的使用方法是定义一个接口，然后在上面添加注解，同时也支持JAX-RS标准的注解。Feign也支持可拔插式的编码器和解码器。Spring Cloud对Feign进行了封装，使其支持了Spring MVC标准注解和HttpMessageConverters。Feign可以与Eureka和Ribbon组合使用以支持负载均衡。

创建springboot项目，选择springboot版本为1.5.3。项目名称为：

consumer

修改pom文件：

>     <?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>
>             <groupId>org.springframework.boot</groupId>
>             <artifactId>spring-boot-starter-parent</artifactId>
>             <version>1.5.3.RELEASE</version>
>             <relativePath/> 
>         </parent>
>         <groupId>com.example</groupId>
>         <artifactId>consumer</artifactId>
>         <version>0.0.1-SNAPSHOT</version>
>         <name>consumer</name>
>         <description>Demo project for Spring Boot</description>
>         <packaging>jar</packaging>
>     
>         <properties>
>             <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
>             <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
>             <java.version>1.8</java.version>
>             <spring-cloud.version>Dalston.RELEASE</spring-cloud.version>
>         </properties>
>     
>         <dependencies>
>             <dependency>
>                 <groupId>org.springframework.cloud</groupId>
>                 <artifactId>spring-cloud-starter-feign</artifactId>
>             </dependency>
>             <dependency>
>                 <groupId>org.springframework.cloud</groupId>
>                 <artifactId>spring-cloud-starter-eureka</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-test</artifactId>
>                 <scope>test</scope>
>                 <exclusions>
>                     <exclusion>
>                         <groupId>org.junit.vintage</groupId>
>                         <artifactId>junit-vintage-engine</artifactId>
>                     </exclusion>
>                 </exclusions>
>             </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>

注意：

<dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-starter-feign</artifactId>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-starter-eureka</artifactId>  
        </dependency>

不能少，还需要添加：

<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>

修改yml文件：

>     eureka:
>       client:
>         service-url:
>           defaultZone: http://peer1:8000/eureka/,http://peer2:8001/eureka/,http://peer3:8002/eureka/
>     spring:
>       application:
>         name: spring-cloud-consumer
>     server:
>       port: 9001

启动类添加注解：

@EnableDiscoveryClient
    @EnableFeignClients

创建远程调用类：

>     @FeignClient(name= "spring-cloud-producer")
>     public interface HelloRemote {
>         @RequestMapping(value = "/hello")
>         String hello(@RequestParam(value = "name") String name);
>     }

创建控制器：

>     @RestController
>     public class ConsumerController {
>         @Autowired
>         private HelloRemote helloRemote;
>     
>         @RequestMapping("/hello/{name}")
>         public String index(@PathVariable("name") String name) {
>             return helloRemote.hello(name);
>         }
>     }

测试，访问地址：[http://localhost:9001/hello/neo][http_localhost_9001_hello_neo]

![2019102816080344.png][]

查看注册中心：

![20191028160818905.png][]

[https_download.csdn.net_download_qq_33333654_12014918]: https://download.csdn.net/download/qq_33333654/12014918
[https_blog.csdn.net_qq_33333654_article_details_102782319]: https://blog.csdn.net/qq_33333654/article/details/102782319
[https_blog.csdn.net_qq_33333654_article_details_102636388]: https://blog.csdn.net/qq_33333654/article/details/102636388
[http_localhost_9001_hello_neo]: http://localhost:9001/hello/neo
[2019102816080344.png]: /images/20230531/8ce27544322c494c99722d91be8db2ed.png
[20191028160818905.png]: /images/20230531/d51f9315066b4af1b8700d50c5793f18.png