3.Spring Cloud Eureka採用 RestTemplate模板做消費者

1.新建工程eurek-consumer，pom.xml文件如下：

<?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>eureka-consmer</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>eureka-consmer</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.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</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>

編寫application.properties文件如下：

# 指定運行端口號
server.port=1113

# 指定服務名稱
spring.application.name=eureka-consmer
# 註冊到Eureka的註冊中心
eureka.client.register-with-eureka=true
# 獲取註冊實例列表
eureka.client.fetch-registry=true
 # 配置註冊中心地址
eureka.client.service-url.defaultZone=http://localhost:1111/eureka

 

程序啓動類，編寫如下：

@EnableDiscoveryClient
@SpringBootApplication
public class EurekaConsmerApplication {
	

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

}

編寫ConsumerConfig類如下所示：

//表示這是一個配置類
@Configuration
public class ConsmerConfig {
	
	//注入bean
	@Bean
	public RestTemplate restTemplate() {
		return new RestTemplate();
	}
}

編寫controller類，如下所示：

@RequestMapping("/test")
@RestController
public class IndexController {
	
	@Autowired
	private DiscoveryClient discoveryClient; 
	
	@Autowired
	private RestTemplate restTemplate;
	
	@RequestMapping(value="/index",method=RequestMethod.GET)
	public String index() {
		List<ServiceInstance> instances = discoveryClient.getInstances("hello-service");
		ServiceInstance serviceInstance = instances.get(0);
		URI uri = serviceInstance.getUri();
		String str = restTemplate.getForObject(uri+"/test/hello", String.class);
		return str;
	}
}

啓動eureka-server工程，再啓動eureka-client，最後啓動eureka-consumer工程

打開遊覽器，輸入http://localhost:11113/test/index,輸出hello word，自此消費完成。