聲明式調用 Fegin

一.初步認知fegin

相比ribbon更方便，簡化了代碼了，代理了請求。整合了hystrix。

二.寫一個feign

三.fegin的應用

pom

org.springframework.cloud

spring-cloud-starter-netflix-eureka-client

yml

server:

port: 8083

spring:

application:

name: feign-consumer

eureka:

client:

service-url:

defaultZone : http://127.0.0.1:10000/eureka/

feign:

hystrix:

enabled: true

hystrix:

command:

default:

execution:

isolation:

thread :

timeoutInMilliseconds: 100

客戶端注解

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication

@EnableFeignClients //啟用feign，如果說需要啟動默認配置，就這么寫，如果需要覆蓋就寫成(@EnableFeignClients(defaultConfiguration = "FooConfiguartion.class"))

public class FeignDemoApplication {

public static void main(String[] args) {

SpringApplication.run(FeignDemoApplication.class, args);

}

}

import com.dn.feigndemo.fallback.HelloDemoFallback;

import com.dn.feigndemo.model.Teacher;

import feign.Body;

import feign.Param;

import org.springframework.cloud.openfeign.FeignClient;

import org.springframework.stereotype.Component;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

@Component

@FeignClient(name="HELLOCLIENT",fallback = HelloDemoFallback.class)

public interface HelloDemoService {

@RequestMapping(value = "",method = RequestMethod.GET)

public Object getTeacher();

@RequestMapping(value = "/user",method = RequestMethod.GET)

public Teacher getByTeacher(@RequestParam("id")String id);

@Body("%7B\"orderNo\": \"{orderNo}\"%7D")

@RequestMapping(value = "/user",method = RequestMethod.POST)

public int addOrder(@Param("orderNo")String orderNo);

@RequestMapping(value = "/user",method = RequestMethod.POST)

public int addTeacher(@Param("orderNo")String orderNo);

}

1.模板 2.設置請求頭

package com.dn.feigndemo.service;

import com.dn.feigndemo.model.Teacher;

import feign.Headers;

import feign.Param;

import org.springframework.web.bind.annotation.RequestMapping;

@Headers("Accept:appliaction/json") //當前接口下，所有的feign請求都會被設置這個頭

public interface FeginHeaderDemo {

@Headers("Content-Type:appliaction/json")

@RequestMapping("")

int addOrder(Teacher teacher);

@Headers("Token:{token}")//設置動態值

@RequestMapping("")

Teacher getOrder(@Param("token")String token);

}

四.fegin的工作流程

五.fegin與hystrix的集成

六.fegin和ribbon的集成

文章來源: www.oschina.net，作者：這很耳東先生，版權歸原作者所有，如需轉載，請聯系作者。

原文鏈接：https://my.oschina.net/u/3728166/blog/3170798

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