创建服务消费者
- Spring Cloud Alibaba-Nacos-服务消费者(LoadBalance)
概述
服务消费者的创建与服务提供者大同小异,这里采用最原始的一种方式,即显示的使用 LoadBalanceClient 和 RestTemplate 结合的方式来访问。
POM
创建一个工程名为 hello-spring-cloud-alibaba-nacos-consumer
的服务消费者项目,pom.xml
配置如下:
4.0.0
com.xxm
hello-spring-cloud-alibaba-dependencies
1.0.0-SNAPSHOT
../hello-spring-cloud-alibaba-dependencies/pom.xml
hello-spring-cloud-alibaba-nacos-consumer
jar
hello-spring-cloud-alibaba-nacos-consumer
https://www.jianshu.com/u/03100dbc8fad
2019-Now
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-actuator
org.springframework.boot
spring-boot-starter-test
test
org.springframework.cloud
spring-cloud-starter-alibaba-nacos-discovery
org.springframework.boot
spring-boot-maven-plugin
com.xxm.hello.spring.cloud.alibaba.nacos.consumer.NacosConsumerApplication
Application
package com.xxm.hello.spring.cloud.alibaba.nacos.consumer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class NacosConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(NacosConsumerApplication.class, args);
}
}
Configuration
创建一个名为 NacosConsumerConfiguration
的 Java 配置类,主要作用是为了注入 RestTemplate
package com.xxm.hello.spring.cloud.alibaba.nacos.consumer.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
@Configuration
public class NacosConsumerConfiguration {
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
Controller
创建一个名为 NacosConsumerController
测试用的 Controller
package com.xxm.hello.spring.cloud.alibaba.nacos.consumer.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class NacosConsumerController {
@Autowired
private LoadBalancerClient loadBalancerClient;
@Autowired
private RestTemplate restTemplate;
@Value("${spring.application.name}")
private String appName;
@GetMapping(value = "/echo/app/name")
public String echo() {
//使用 LoadBalanceClient 和 RestTemplate 结合的方式来访问
ServiceInstance serviceInstance = loadBalancerClient.choose("nacos-provider");
String url = String.format("http://%s:%s/echo/%s", serviceInstance.getHost(), serviceInstance.getPort(), appName);
return restTemplate.getForObject(url, String.class);
}
}
application.yml
spring:
application:
name: nacos-consumer
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
server:
port: 9091
management:
endpoints:
web:
exposure:
include: "*"
启动工程
通过浏览器访问 http://localhost:8848/nacos
,即 Nacos Server 网址
你会发现多了一个名为 nacos-consumer
的服务
这时打开 http://localhost:9091/echo/app/name
,你会在浏览器上看到:
Hello Nacos Discovery nacos-consumer
服务的端点检查
通过浏览器访问 http://localhost:9091/actuator/nacos-discovery
你会在浏览器上看到: