Spring Cloud Feign使用详解-阿里云开发者社区

Spring Cloud Feign使用详解

2023-09-02 95

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简介： Spring Cloud Feign使用详解

快速入门

在本节中，我们将通过一个简单示例来展示Spring Cloud Feign在服务客户端定义所带来的便利。下面等示例将继续使用之前我们实现等hello-service服务，这里我们会通过Spring Cloud Feign提供的声明式服务绑定功能来实现对该服务接口的调用。

▪️首先，创建一个Spring Boot基础工程，取名为kyle-service-feign，并在pom.xml中引入spring-cloud-starter-eureka和spring-cloud-starter-feign依赖，具体内容如下所示。

父工程build.gradle 也是注册中心

plugins {
    id 'org.springframework.boot' version '2.5.6'
    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'
configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}
repositories {
    maven { url 'https://maven.aliyun.com/repository/public' }
    mavenCentral()
}
dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
//    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-server'
//    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-hystrix'
//    implementation 'org.springframework.cloud:spring-cloud-starter-openfeign'
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'mysql:mysql-connector-java'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
ext {
    set('springCloudVersion', "2020.0.4")
}
dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}
test {
    useJUnitPlatform()
}
//针对所有project的配置，包含根项目，除此之外还有subprojects 和 project，感兴趣的童鞋可以自行百度查阅
allprojects {
    //创建项目时的你
    //项目是java项目
    apply plugin: 'java'
    //项目是idea项目
    apply plugin: 'idea'
    //jdk版本
    sourceCompatibility = 17
}
// 子项目配置
subprojects {
    apply plugin: 'java'
    //项目是idea项目
    apply plugin: 'idea'
    apply plugin: 'org.springframework.boot'
    apply plugin: 'io.spring.dependency-management'
    //错误写法 ，不能携带版本号
//    apply plugin: 'org.springframework.boot:2.5.6'
//    apply plugin: 'io.spring.dependency-management:1.0.11.RELEASE'
    repositories {
        //国内阿里云仓库配置
        maven { url 'https://maven.aliyun.com/repository/public' }
        mavenCentral()
    }
    sourceCompatibility = '17'
}

启动类

package com.example.feigndemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
//@EnableEurekaClient
public class FeignEurekaServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(FeignEurekaServerApplication.class, args);
    }
}

生产者

plugins {
//    id 'org.springframework.boot' version '2.5.6'
//    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'
configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}
repositories {
    maven{url 'https://maven.aliyun.com/repository/public'}
    mavenCentral()
}
ext {
    set('springCloudVersion', "2020.0.4")
}
dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
//    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-server'
//    implementation 'org.springframework.cloud:spring-cloud-starter-openfeign'
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'mysql:mysql-connector-java'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}
test {
    useJUnitPlatform()
}

package com.example.feigndemo;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController {
    @ResponseBody
    @RequestMapping("test")
    public String test(){
        return "Hello World!";
    }
}

spring:
  application:
    name: feign-producer
server:
  port: 8763
eureka:
  client:
    #??????????Eureka Server????true?
    registerWithEureka: true
    #?????Eureka Server??????????true?
    fetchRegistry: true
    #server:
    #waitTimeInMsWhenSyncEmpty: 0
    #???Eureka Server??????????????????????
    serviceUrl:
      defaultZone: http://127.0.0.1:8761/eureka/

消费者

plugins {
//    id 'org.springframework.boot' version '2.5.6'
//    id 'io.spring.dependency-management' version '1.0.11.RELEASE'
    id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '17'
configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}
repositories {
    maven{url 'https://maven.aliyun.com/repository/public'}
    mavenCentral()
}
ext {
    set('springCloudVersion', "2020.0.4")
}
dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
//    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-server'
    implementation 'org.springframework.cloud:spring-cloud-starter-openfeign'
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'mysql:mysql-connector-java'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}
test {
    useJUnitPlatform()
}

package com.example.feigndemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class FeignConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(FeignConsumerApplication.class, args);
    }
}

package com.example.feigndemo;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
public class Test1Controller {
    @Resource
    FeignProducerClient feignProducerClient;
    @Resource
    FeignDatawayClient feignDatawayClient;
    @RequestMapping("/")
    public String hello() {
        return feignProducerClient.test();
    }
    @RequestMapping("/test2")
    public String test2() {
        return feignProducerClient.test();
    }
    @RequestMapping("/test3")
    public String test3() {
        return feignDatawayClient.test();
    }
}

package com.example.feigndemo;
import org.springframework.web.bind.annotation.RequestMapping;
@org.springframework.cloud.openfeign.FeignClient(name = "feign-producer")
public interface FeignProducerClient {
    @RequestMapping("test")
    public String test();
}

源码地址

https://gitee.com/stylesmile/spring-boot-study/tree/master/gradle-cloud-project/cloud-feign-demo

Spring Cloud Feign使用详解

快速入门

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