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Feign简介
Feign是一个声明式的伪Http客户端, 它使得写Http客户端变得简单, 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。
Feign采用的是基于接口的注解
Feign整合了Ribbon
创建服务消费者
创建一个工程名为hello-spring-cloud-web-admin-feign的服务消费者项目, pom配置如下
<?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>com.funtl</groupId><artifactId>hello-spring-cloud-dependencies</artifactId><version>1.0.0-SNAPSHOT</version><relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath></parent><artifactId>hello-spring-cloud-web-admin-feign</artifactId><packaging>jar</packaging><name>hello-spring-cloud-web-admin-feign</name><url>http://www.funtl.com</url><inceptionYear>2018-Now</inceptionYear><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-server</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><dependency><groupId>net.sourceforge.nekohtml</groupId><artifactId>nekohtml</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><mainClass>com.funtl.hello.spring.cloud.web.admin.feign.WebAdminFeignApplication</mainClass></configuration></plugin></plugins></build>
</project>
创建WebAdminFeignApplication
package com.funtl.hello.spring.cloud.web.admin.feign;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class WebAdminFeignApplication {public static void main(String[] args) {SpringApplication.run(WebAdminFeignApplication.class, args);}
}
application.yml
spring:application:name: hello-spring-cloud-web-admin-feignthymeleaf:cache: falsemode: LEGACYHTML5encoding: UTF-8servlet:content-type: text/html
server:port: 8765
eureka:client:serviceUrl:defaultZone: http://localhost:8761/eureka/
创建Feign接口
通过@FeignClient(“服务名”)注解来指定调用哪个服务
package com.funtl.hello.spring.cloud.web.admin.feign.service;import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;@FeignClient(value="hello-spring-cloud-service-admin")
public interface AdminService {@RequestMapping(value="hi", method= RequestMethod.GET)public String sayHi(@RequestParam String message);
}
创建测试用的Controller
package com.funtl.hello.spring.cloud.web.admin.feign.controller;import com.funtl.hello.spring.cloud.web.admin.feign.service.AdminService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;@RestController
public class AdminController {@Autowiredprivate AdminService adminService;@RequestMapping(value="hi", method= RequestMethod.GET)public String sayHi(String message){return adminService.sayHi(message);}
}
测试访问
在浏览器上多次访问http://localhost:8765/hi?message=HelloFeign
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