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EureKa服务注册发现与调用_前端能注入eureka吗

作者：笔触狂放9 | 2024-08-19 02:09:31

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前端能注入eureka吗

公司需要对提高项目的响应速度，经研究决定使用eureka微服务改造项目，于是自己做了一个小demo进行学习。

一、eureka简介

Eureka是Netflix开发的服务发现框架，本身是一个基于REST的服务，主要用于定位运行在AWS域中的中间层服务，以达到负载均衡和中间层服务故障转移的目的。SpringCloud将它集成在其子项目spring-cloud-netflix中，以实现SpringCloud的服务发现功能。Eureka采用cs架构：Eureka Server和Eureka Client，即服务端和客户端。

客户端将服务注册到服务端，客户端之间可以通过eureka服务的注册信息进行调用。客户端可以同时注册多个eureka服务，从而实现高可用，客户端可以发布多个到eureka上实现负载均衡。

二、Eureka Serve服务端

1、首先构建一个springboot项目,并在pom.xml中添加依赖

pom.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3. 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  4. 	<modelVersion>4.0.0</modelVersion>
  5. 	<parent>
  6. 		<groupId>org.springframework.boot</groupId>
  7. 		<artifactId>spring-boot-starter-parent</artifactId>
  8. 		<version>2.1.1.RELEASE</version>
  9. 		<relativePath/> <!-- lookup parent from repository -->
  10. 	</parent>
  11. 	<groupId>cn.itcast</groupId>
  12. 	<artifactId>eureka</artifactId>
  13. 	<version>0.0.1-SNAPSHOT</version>
  14. 	<name>eureka</name>
  15. 	<description>Demo project for Spring Boot</description>
  16.  
  17. 	<properties>
  18. 		<java.version>1.8</java.version>
  19. 		<spring-cloud.version>Greenwich.RC2</spring-cloud.version>
  20. 	</properties>
  21.  
  22. 	<dependencies>
  23. 		<dependency>
  24. 			<groupId>org.springframework.cloud</groupId>
  25. 			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
  26. 		</dependency>
  27. 		<dependency>
  28. 			<groupId>org.springframework.boot</groupId>
  29. 			<artifactId>spring-boot-starter-test</artifactId>
  30. 			<scope>test</scope>
  31. 		</dependency>
  32. 	</dependencies>
  33.  
  34. 	<dependencyManagement>
  35. 		<dependencies>
  36. 			<dependency>
  37. 				<groupId>org.springframework.cloud</groupId>
  38. 				<artifactId>spring-cloud-dependencies</artifactId>
  39. 				<version>${spring-cloud.version}</version>
  40. 				<type>pom</type>
  41. 				<scope>import</scope>
  42. 			</dependency>
  43. 		</dependencies>
  44. 	</dependencyManagement>
  45.  
  46. 	<build>
  47. 		<plugins>
  48. 			<plugin>
  49. 				<groupId>org.springframework.boot</groupId>
  50. 				<artifactId>spring-boot-maven-plugin</artifactId>
  51. 			</plugin>
  52. 		</plugins>
  53. 	</build>
  54.  
  55. 	<repositories>
  56. 		<repository>
  57. 			<id>spring-milestones</id>
  58. 			<name>Spring Milestones</name>
  59. 			<url>https://repo.spring.io/milestone</url>
  60. 		</repository>
  61. 	</repositories>
  62. </project>

 2、配置application.yml

  1. server:
  2.   port: 8761     
  3. eureka:
  4.   client:
  5.     #是否向服务注册中心注册自己
  6.     register-with-eureka: false
  7.     #是否启用获取服务注册信息,不需要同步其他的Eureka Server节点的数据，故而设为false
  8.     fetch-registry: false

 

3、主函数类中添加注解EurekaApplication

  1. @EnableEurekaServer 
  2. @SpringBootApplication
  3. public class EurekaApplication {
  4.  
  5. 	public static void main(String[] args) {
  6. 		SpringApplication.run(EurekaApplication.class, args);
  7. 	}
  8.  
  9. }

4、启动主函数就可以访问eureka注册中心了http://localhost:8761/

 三、Eureka Client客户端

首先创建一个生产者，即服务的提供者，生产者和消费者没有绝对的区分，只是在服务调用的时候扮演的不同角色。

1、首先构建一个springboot项目,并在pom.xml中添加依赖

pom.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3. 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
  4. 	<modelVersion>4.0.0</modelVersion>
  5.   <parent>
  6. 		<groupId>org.springframework.boot</groupId>
  7. 		<artifactId>spring-boot-starter-parent</artifactId>
  8. 		<version>2.1.1.RELEASE</version>
  9. 		<relativePath/> <!-- lookup parent from repository -->
  10. 	</parent>
  11.   <groupId>cn.vtits</groupId>
  12.   <artifactId>provider</artifactId>
  13.   <version>1.0.0-SNAPSHOT</version>
  14. 	<properties>
  15. 		<java.version>1.8</java.version>
  16. 		<spring-cloud.version>Greenwich.RC2</spring-cloud.version>
  17. 	</properties>
  18. 	<dependencies>
  19. 		<dependency>
  20.             <groupId>org.springframework.cloud</groupId>
  21.             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
  22.         </dependency>
  23.         <dependency> 
  24. 			<groupId>org.springframework.boot</groupId> 
  25. 			<artifactId>spring-boot-starter</artifactId> 
  26. 		</dependency> 
  27. 		<dependency> 
  28. 		     <groupId>org.springframework.boot</groupId> 
  29. 			<artifactId>spring-boot-starter-web</artifactId> 
  30. 		</dependency>
  31. 		
  32.     </dependencies>
  33. 	<dependencyManagement>
  34. 		<dependencies>
  35. 			<dependency>
  36. 				<groupId>org.springframework.cloud</groupId>
  37. 				<artifactId>spring-cloud-dependencies</artifactId>
  38. 				<version>${spring-cloud.version}</version>
  39. 				<type>pom</type>
  40. 				<scope>import</scope>
  41. 			</dependency>
  42. 		</dependencies>
  43.    </dependencyManagement>
  44.    <build>
  45.    		<defaultGoal>compile</defaultGoal>
  46. 		<plugins>
  47. 			<plugin>
  48. 				<groupId>org.springframework.boot</groupId>
  49. 				<artifactId>spring-boot-maven-plugin</artifactId>
  50. 			</plugin>
  51. 		</plugins>
  52.   </build>
  53.   <repositories>
  54. 		<repository>
  55. 			<id>spring-milestones</id>
  56. 			<name>Spring Milestones</name>
  57. 			<url>https://repo.spring.io/milestone</url>
  58. 		</repository>
  59. 	</repositories>
  60. </project>

2、配置application.yml

  1. server:
  2.   port: 8762
  3. spring:
  4.   application:
  5.     name: hello-service
  6.  
  7. eureka:
  8.   client:
  9.     service-url:
  10.       defaultZone: http://localhost:8761/eureka #注册eureka的地址，由于eureka在本地

3、主函数添加注解

  1. @Configuration
  2. @EnableAutoConfiguration
  3. @ComponentScan
  4. public class ProviderApplication {
  5.       public static void main(String[] args) {
  6.           SpringApplication.run(ProviderApplication.class, args);
  7.       }
  8. }

4、添加测试用例

  1. @RestController
  2. public class MainController {
  3.  
  4. 	@GetMapping("/test/{name}")
  5.       String home(@PathVariable("name") String t) {
  6.         return "Hello World!"+t;
  7.       }
  8. }

5、启动主函数打开eureka注册中心

看到我们的服务注册到eureka服务上了。

访问http://localhost:8762/test/JAVA

创建一个服务消费者

6、构建一个springboot项目,并在pom.xml中添加依赖

pom.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3. 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
  4. 	<modelVersion>4.0.0</modelVersion>
  5.   <parent>
  6. 		<groupId>org.springframework.boot</groupId>
  7. 		<artifactId>spring-boot-starter-parent</artifactId>
  8. 		<version>2.1.1.RELEASE</version>
  9. 		<relativePath/> <!-- lookup parent from repository -->
  10. 	</parent>
  11.   <groupId>cn.vtits</groupId>
  12.   <artifactId>provider</artifactId>
  13.   <version>1.0.0-SNAPSHOT</version>
  14.   
  15. 	<properties>
  16. 		<java.version>1.8</java.version>
  17. 		<spring-cloud.version>Greenwich.RC2</spring-cloud.version>
  18. 	</properties>
  19. 	
  20. 	<dependencies>
  21. 	<dependency>
  22.             <groupId>org.springframework.boot</groupId>
  23.             <artifactId>spring-boot-starter-web</artifactId>
  24.         </dependency>
  25.         <dependency>
  26.             <groupId>org.springframework.cloud</groupId>
  27.             <artifactId>spring-cloud-starter-openfeign</artifactId>
  28.         </dependency>
  29.         <dependency>
  30.             <groupId>org.springframework.cloud</groupId>
  31.             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
  32.         </dependency>
  33.         <dependency> 
  34. 			<groupId>org.springframework.boot</groupId> 
  35. 			<artifactId>spring-boot-starter</artifactId> 
  36. 		</dependency> 
  37. 		<dependency> 
  38. 		     <groupId>org.springframework.boot</groupId> 
  39. 			<artifactId>spring-boot-starter-web</artifactId> 
  40. 		</dependency>
  41. 		
  42.     </dependencies>
  43.  
  44. 	<dependencyManagement>
  45. 		<dependencies>
  46. 			<dependency>
  47. 				<groupId>org.springframework.cloud</groupId>
  48. 				<artifactId>spring-cloud-dependencies</artifactId>
  49. 				<version>${spring-cloud.version}</version>
  50. 				<type>pom</type>
  51. 				<scope>import</scope>
  52. 			</dependency>
  53. 		</dependencies>
  54.    </dependencyManagement>
  55.  
  56.    <build>
  57.    		<defaultGoal>compile</defaultGoal>
  58. 		<plugins>
  59. 			<plugin>
  60. 				<groupId>org.springframework.boot</groupId>
  61. 				<artifactId>spring-boot-maven-plugin</artifactId>
  62. 			</plugin>
  63. 		</plugins>
  64.   </build>
  65.   <repositories>
  66. 		<repository>
  67. 			<id>spring-milestones</id>
  68. 			<name>Spring Milestones</name>
  69. 			<url>https://repo.spring.io/milestone</url>
  70. 		</repository>
  71. 	</repositories>
  72. </project>

 7、主函数添加注解

  1. @SpringBootApplication
  2. @EnableDiscoveryClient
  3. @EnableFeignClients
  4. public class ConsumerApplication {
  5.       public static void main(String[] args) {
  6.           SpringApplication.run(ConsumerApplication.class, args);
  7.       }
  8. }

8、配置application.yml

  1. server:
  2.   port: 8763
  3. spring:
  4.   application:
  5.     name: consumer
  6.  
  7. eureka:
  8.   client:
  9.     service-url:
  10.       defaultZone: http://localhost:8761/eureka

9、创建ServiceFeignClient类，作为服务调用接口

  1. //name为生产者提供的服务名称
  2. @FeignClient(name = "hello-service" )
  3. public interface ServiceFeignClient {
  4. 	 
  5.     //这里接口要与被生产者home一致
  6.     @GetMapping("/test/{name}")
  7.     String home(@PathVariable("name") String name);
  8. }

10、编写ConsumerController，调用ServiceFeignClient

  1. @RestController
  2. public class ConsumerController {
  3. 	@Autowired
  4. 	ServiceFeignClient serviceFeignClient;
  5.  
  6.     @GetMapping("/test1/{name}")
  7.     public String index(@PathVariable("name") String name) {
  8.         return serviceFeignClient.home(name);
  9.     }
  10. }

11、启动主函数打开eureka注册中心

12、访问http://localhost:8763/test1/JDK

这样消费者就从eureka服务调用到了eureka生产者的服务。

 

 

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