SpringCloudAlibaba（三）——Nacos客户端开发和openfeign服务间通信

Nacos客户端开发和openfeign服务间通信

nacos客户端开发

1、新建一个模块springclouAlibaba-nacos-client-8989

2、导入相关依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>
<!--引入nacos client的依赖-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency>

3、编写application.properties配置文件

server.port=8989
spring.application.name=NACOSCLIENT

#指定服务名称
spring.cloud.nacos.server-addr=47.106.105.80:8848

4、编写主启动类

package com.study.springcloudAlibaba;

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

@SpringBootApplication
@EnableDiscoveryClient   //开启服务的注册(可以省略不写)
public class NacosClientApplication {
    public static void main(String[] args) {
        SpringApplication.run(NacosClientApplication.class,args);
    }
}

5、启动测试

openfeign服务间的通信

一、生产者模块

1、新建一个提供者模块springcloudAlibaba-products-9090

2、导入相关依赖

 <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
</dependencies>

3、编写application.properties配置文件

server.port=9090
spring.application.name=PRODUCTS

#指定nacos server地址
spring.cloud.nacos.server-addr=47.106.105.80:8848

4、编写主启动类

package com.sutdy.springcloudAlibaba;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ProductsApplication_9090 {
    public static void main(String[] args) {
        SpringApplication.run(ProductsApplication_9090.class,args);
    }
}

5、编写controller层

package com.sutdy.springcloudAlibaba.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ProductsController {

    @Value("${server.port}")
    private int port;

    @GetMapping("/product/{id}")
    public String products(@PathVariable("id") Integer id){
        return "调用商品服务返回："+id+",当前提供服务的端口为："+port;
    }
}

二、消费者模块

1、新建一个消费者模块springcloudAlibaba-users-8989

2、导入相关依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--引入nacos client的依赖-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--导入openfeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>

3、编写application.properties配置文件

server.port=8989
spring.application.name=USERS

#指定nacos server地址
spring.cloud.nacos.server-addr=47.106.105.80:8848

4、编写主启动类,添加`@EnableFeignClients`注解开启Openfeign

package com.study.springcloudAlibaba;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableFeignClients //开启Openfeign调用支持
public class UserApplication_8989 {
    public static void main(String[] args) {
        SpringApplication.run(UserApplication_8989.class,args);
    }
}

5、编写openfeign客户端接口，添加`@FeignClient("PRODUCTS")`注解调用名称为"PRODUCTS"的微服务，实现服务之间的通信。

package com.study.springcloudAlibaba.feignclients;

import org.springframework.cloud.openfeign.FeignClient;

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


@FeignClient("PRODUCTS")
public interface ProductClient {
    @RequestMapping("/product/{id}")
    String product(@PathVariable("id") Integer id);
}

6、编写controller层实现服务通信接口

package com.study.springcloudAlibaba.controller;

import com.study.springcloudAlibaba.feignclients.ProductClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    @Autowired
    private ProductClient productClient;

    @GetMapping("/invoke")
    public String invokeProduct(){
        String result = productClient.product(21);
        return "调用用户服务成功.....调用商品服务结果：{}"+result;
    }
}