nacos+feign简化代码最终章

创建代码

? nacos-provider服务方，nacos-consumer服务方，nacos-parent父工程

maven坐标

nacos-provider：

<dependencies>
        <!--nacos坐标-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>0.2.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>1.1.0</version>
        </dependency>
        <!--springboot web启动依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

? nacos-consumer：

<dependencies>
        <!--nacos-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>0.2.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>1.1.0</version>
        </dependency>
        <!--springboot web启动依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--feign简化代码坐标-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>

? nacos-parent:


    <!--spring boot 环境 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/>
    </parent>
    <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 版本-->
        <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    </properties>
    <!--引入Spring Cloud 依赖-->
    <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>

yml

? nacos-provider:

server:
  port: 8000
spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848 #配置nacos服务端地址
  application:
    name: nacos-provider

? nacos-consumer

server:
  port: 9000
spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848 #配nacos服务端地址
  application:
    name: nacos-consumer

服务调用代码

nacos-provider:

domain包下面的Goods类

package com.miracle.nacosprovider.domain;

public class Goods {
    private int id;
    private String title;
    private int price;
    private int count;

    public Goods() {
    }

    public Goods(int id, String title, int price, int count) {
        this.id = id;
        this.title = title;
        this.price = price;
        this.count = count;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }
}

dao包下面的类GoodsDao

package com.miracle.nacosprovider.dao;

import com.miracle.nacosprovider.domain.Goods;
import org.springframework.stereotype.Repository;

@Repository
public class GoodsDao {
    public Goods findOne(int id){
        return new Goods(1,"华为手机",8999,10000);
    }
}

service包下面的GoodsService类

package com.miracle.nacosprovider.service;

import com.miracle.nacosprovider.dao.GoodsDao;
import com.miracle.nacosprovider.domain.Goods;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class GoodsService {
    @Autowired
    private GoodsDao goodsDao;
    public Goods findOne(int id){
        return goodsDao.findOne(id);

    }
}

controller下面的类GoodsController

package com.miracle.nacosprovider.controller;

import com.miracle.nacosprovider.domain.Goods;
import com.miracle.nacosprovider.service.GoodsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/goods")
public class GoodsController {
    @Autowired
    private GoodsService goodsService;
    @GetMapping("/goods/{id}")
    public Goods findOne(@PathVariable("id") int id){
        Goods goods = goodsService.findOne(id);
        return goods;
    }
}

启动类NacosProviderApp

package com.miracle.nacosprovider;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient//作为服务中心必须要开启这个服务
public class NacosProviderApp {
    public static void main(String[] args) {
        SpringApplication.run(NacosProviderApp.class,args);
    }
}

nacos-consumer:

domain和provider一样不变

controller包里面的OrderController类

package com.miracle.nacosconsumer.controller;

import com.miracle.nacosconsumer.domain.Goods;
import com.miracle.nacosconsumer.feign.GoodsFeignClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/order")
public class OrderController {
    @Autowired
    private GoodsFeignClient goodsFeignClient;
    @GetMapping("/goods/{id}")
    public Goods findGoodsById(@PathVariable("id") int id){
        Goods goods = goodsFeignClient.findGoodsById(id);
        return goods;
    }
}

feign包下面的GoodsFeignClient接口

package com.miracle.nacosconsumer.feign;


import com.miracle.nacosconsumer.domain.Goods;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
//创建被调用方的值，需要和注册中心里面获得的名称一样
@FeignClient(value = "nacos-provider")
public interface GoodsFeignClient {

    //讲provider里面需要调用的类通过接口写过来加上路劲从第一个路劲到最后一个路劲
    @GetMapping("/goods/goods/{id}")
    public Goods findGoodsById(@PathVariable("id") int id);

}

nacos启动

第一步

	Nacos（Dynamic Naming and Configuration Service） 是阿里巴巴2018年7月开源的项目。它专注于服务发现和配置管理领域 致力于帮助您发现、配置和管理微服务。Nacos 支持几乎所有主流类型的“服务”的发现、配置和管理。一句话概括就是Nacos = Spring Cloud注册中心 + Spring Cloud配置中心。

官网：https://nacos.io/
下载地址： https://github.com/alibaba/nacos/releases