Spring Cloud Consul 服務註冊與消費

1.下載Consul，下載地址爲：https://www.consul.io/downloads

2.下載解壓，配置環境變量，例如:環境變量是爲C:\tools\consul

3.cmd 輸入consul -version命令，查看是否安裝成功

4.打開cmd運行consul.exe  agent -dev啓動

5.瀏覽器輸入http://localhost:8500/ui ，可以看到如下界面表示ok冒得問嘚

 

服務提供者搭建

服務提供者和消費者是一樣的pom.xml，並沒有什麼不同，如下所示：

<?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>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.8.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.hangzhou.springcloud</groupId>
	<artifactId>consul-producer</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>consul-server</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>Hoxton.SR6</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-consul-discovery</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<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>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

application.properties文件如下：

# 指定運行的端口號
server.port=8501
# 工程名字
spring.application.name=consul-producer
# 去此地址註冊(ip和端口號)
spring.cloud.consul.host=localhost
spring.cloud.consul.port=8500
# 註冊服務的服務名
spring.cloud.consul.discovery.service-name=consul-producer

程序啓動類，代碼如下：

//支持服務註冊
@EnableDiscoveryClient
@SpringBootApplication
public class ConsulServerApplication {

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

}

編寫Controller類如下：

@RequestMapping(value="/cousul")
@RestController
public class HelloController {
	@Autowired
	DiscoveryClient discoveryClient;
	
	@Value("${server.port}")
	private String port;
	
	@RequestMapping(value= {"/sayHello"},method=RequestMethod.GET)
	public String sayHello() {
		return "你好，我是服務生產者"+port;
	}
}

更改application.properties文件中的端口號爲8601，再啓動一次，瀏覽器輸入http://localhost:8500/ui/dc1/services/consul-producer/instances，效果如下所示：

打開postman，運行以下這兩個服務是否暢通，http://localhost:8601/cousul/sayHello，http://localhost:8501/cousul/sayHello，不再多贅述，自行去做。

 

消費者搭建，pom.xml文件不變。

application.properties文件如下所示：

server.port=8701

spring.application.name=consul-consumer
spring.cloud.consul.host=localhost
spring.cloud.consul.port=8500
# 不用註冊了，反正沒有誰調用我
spring.cloud.consul.discovery.register=false
spring.cloud.consul.discovery.service-name=consul-consumer

程序啓動類，不用修改，保持默認的就好

@SpringBootApplication
public class ConsulConsumerApplication {

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

}

controller類如下：

@RequestMapping("/test")
@RestController
public class ConsumerController {
	
	@Resource
	private LoadBalancerClient loadBalancerClient;
	
	@Resource
	DiscoveryClient discoveryClient;
	
	@Autowired
	RestTemplate restTemplate;
	
	@GetMapping("/hehe")
	public String he() {
		return "haha";
	}
	
	@RequestMapping(value="/index",method=RequestMethod.GET)
	public String customer() {
		ServiceInstance choose = loadBalancerClient.choose("consul-producer");
		URI uri = choose.getUri();
		System.out.println("uri的地址是：" + uri);
		
		String forObject = restTemplate.getForObject(uri+"/cousul/sayHello", String.class);
		return  forObject;
	}
}

不要忘記rest模板注入bean哦，一併貼上

@Configuration
public class ConsumerConfig {
	
	@Bean
	public RestTemplate restTemplate() {
		return new RestTemplate();
	}
	
}

自此，完成了，輸入http://localhost:8701/test/index，訪問結果下圖所示：