springcloud consul

代码必须有包名，比如test。如果没有，运行会报错。

一.下载consul的windows版本consul_1.6.2_windows_amd64.zip

1.解压之后只有一个文件，consul.exe

2.新建文件run.bat，内容如下：

consul agent -dev
pause

默认启动端口号是8500，访问地址： 

http://127.0.0.1:8500/ui/dc1/services

二.建立producer工程spring-cloud-consul-producer

pom.xml

<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>
	<groupId>consul-test</groupId>
	<artifactId>consul-test</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>consul-test</name>
	<packaging>jar</packaging>
	<description>consul-test</description>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencyManagement>
		<dependencies>
			<!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> 
				<version>2.0.0.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> -->
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Finchley.M8</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-actuator</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-consul</artifactId>
		</dependency>

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

新建文件application.properties

spring.application.name=spring-cloud-consul-producer
server.port=8501
#spring.cloud.consul.host=127.0.0.1
#spring.cloud.consul.port=8500
spring.cloud.consul.discovery.serviceName=service-producer

application.yml启动优先级小于bootstrap.yml，会报错：Fetching config from server at : http://localhost:8888

所以需要：新建bootstrap.yml

spring:
  cloud:
    config:
      uri: http://localhost:8500

demo代码：

package test;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
	@RequestMapping("/hello")
	public String hello() {
		return "hello consul";
	}
}

　　

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

@SpringBootApplication
@EnableDiscoveryClient
public class SpringCloudConsulProducerApplication {

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

consul健康检查服务请求：http://127.0.0.1:8501/actuator/health

三.建立consumer工程spring-cloud-consul-consumer

pom.xml

<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>
    <groupId>consul-test</groupId>
    <artifactId>consul-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>consul-test</name>
    <packaging>jar</packaging>
    <description>consul-test</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
    </parent>
    <dependencyManagement>
        <dependencies>
            <!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> 
                <version>2.0.0.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.M8</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul</artifactId>
        </dependency>

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

application.properties

spring.application.name=spring-cloud-consul-consumer
server.port=8503
#spring.cloud.consul.host=127.0.0.1
#spring.cloud.consul.port=8500
spring.cloud.consul.discovery.register=false

　

application.yml启动优先级小于bootstrap.yml，会报错：Fetching config from server at : http://localhost:8888

所以需要：新建bootstrap.yml

spring:
  cloud:
    config:
      uri: http://localhost:8500

demo代码：

package test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class CallHelloController {
	@Autowired
	private LoadBalancerClient loadBalancerClient;

	@RequestMapping("/call")
	public String call() {
		ServiceInstance serviceInstance = loadBalancerClient.choose("service-producer");
		System.out.println("服务地址：" + serviceInstance.getUri());
		System.out.println("服务名称：" + serviceInstance.getServiceId());

		String callServiceResult = new RestTemplate().getForObject(serviceInstance.getUri().toString() + "/hello",
				String.class);
		System.out.println(callServiceResult);
		return callServiceResult;
	}
}

　　

package test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ServiceController {
	@Autowired
	private LoadBalancerClient loadBalancerClient;
	@Autowired
	private DiscoveryClient discoveryClient;

	/**
	 * 获取所有服务
	 */
	@RequestMapping("/services")
	public Object services() {
		return discoveryClient.getInstances("service-producer");
	}

	/**
	 * 从所有服务中选择一个服务（轮询）
	 */
	@RequestMapping("/discover")
	public Object discover() {
		return loadBalancerClient.choose("service-producer").getUri().toString();
	}

}

　　

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

@SpringBootApplication
public class SpringCloudConsulConsumerApplication {

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

四.测试

启动SpringCloudConsulProducerApplication和SpringCloudConsulConsumerApplication

http://127.0.0.1:8503/services

http://127.0.0.1:8503/call