springcloud 系列入门教程整理（之二）feign服务提供者

「爱情、让人受尽委屈。」 2022-02-19 16:45 203阅读 0赞

之一传送门：[注册中心eureka的搭建][eureka]

feign 是springcloud体系中，系统与系统互相调用接口的技术。底层利用httpclient 实现。

（1）搭建普通的maven项目。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25leW1hcl9qcg_size_16_color_FFFFFF_t_70][]

（2）pom

<?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>
    
        <groupId>com.zhihao</groupId>
        <artifactId>feignService</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
        </properties>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.0.RELEASE</version>
        </parent>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Finchley.BUILD-SNAPSHOT</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <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-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.11</version>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    
        <repositories>
            <repository>
                <id>spring-snapshots</id>
                <name>Spring Snapshots</name>
                <url>https://repo.spring.io/libs-snapshot</url>
                <snapshots>
                    <enabled>true</enabled>
                </snapshots>
            </repository>
        </repositories>
    
        <build>
            <finalName>feignService</finalName>
        </build>
    
    
    </project>

（3）配置文件application.yml

server:
      port: 8600
    
    spring:
      application:
        name: feignService
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8800/eureka/
    app:
      ip: localhost

（3）实体类，不必要，只是为了返回对象创建的实体类。

package com.zhihao.model;
    
    public class Result {
    
        private int code;
    
        private String message;
    
        private Object content;
    
        private String serviceName;
    
        private String host;
    
    //  注意，以下省略了get和set方法，省篇幅。
    
    }

（4）controller 接口类

import com.zhihao.model.Result;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class TestController {
    
        @RequestMapping("/who")
        public Object who() {
            Result result = new Result();
            result.setServiceName("I am feign service");
            result.setMessage("chenzhihao is me!");
            return result;
        }
    
    }

（5）启动类

import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    @EnableDiscoveryClient
    @SpringBootApplication
    public class App {
    
        public static void main(String[] args) {
            SpringApplication.run(App.class, args);
        }
    }

OK。就是一个普通的springboot 项目，为了给其他子系统提供接口调用而搭建的。启动之后，在注册中心会看见本系统。

[eureka]: https://blog.csdn.net/neymar_jr/article/details/89342457
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