SpringBoot2.0--SpringCloud--微服务-搭建Eureka服务发现

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

实例

1.微服务项目构建

首先创建spring-cloud文件夹，复制上个文章中的项目并修改名称为microservice-consumer-movie、microservice-provider-user（具体的代码不在这里详写了，请到https://blog.csdn.net/oGuiGui12345/article/details/89915712查看）。

然后创建SpringBoot项目microservice-discovery-eureka，并放到spring-cloud文件夹下。

创建pom.xml并放到spring-cloud文件夹下。

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.1.4.RELEASE
		 
	
	
	com.itmuch.cloud
	microservice-spring-cloud
	0.0.1-SNAPSHOT
	pom
	
	
		1.8
	
	
  
  	microservice-consumer-movie
  	microservice-provider-user
  	microservice-discovery-eureka
  
  
  
   
      org.springframework.cloud
      spring-cloud-starter-netflix-eureka-server
   
  
  
  
  	
		
			org.springframework.boot
			spring-boot-dependencies
			2.1.4.RELEASE
			pom
			import
		
		
		
		    org.springframework.cloud
		    spring-cloud-dependencies
		    Greenwich.RELEASE
		    pom
		    import
		
	
  
  
  
	
		
			org.springframework.boot
			spring-boot-maven-plugin
		
	
  

然后导入spring-cloud目录下的3个项目

点击下图中的右上角的小三角，选择Projects Presentation-->Hierarchical, 显示效果如下图

2.搭建服务发现 microservice-discovery-eureka

修改pom.xml文件

  4.0.0
  
  
	 com.itmuch.cloud
	 microservice-spring-cloud
	 0.0.1-SNAPSHOT
  

  microservice-discovery-eureka
  jar

  
    UTF-8
  

 
    
      org.springframework.boot
      spring-boot-starter-security
   
 

修改application.yml

1. security表示设置Eureka服务发现登陆校验开启，同时设置用户名和密码
2. registerWithEureka: false 和fetchRegistry: false 表示不注册服务发现自身
3.  defaultZone: http://user:password123@localhost:8761/eureka 用户名为user 密码为password123

spring:
  security:
    user:
      name: user
      password: password123
server:
  port: 8761
  tomcat:
      uri-encoding: UTF-8
      max-http-header-size: 8096
eureka:
  client:
   registerWithEureka: false
   fetchRegistry: false
   service-url:
      defaultZone: http://user:password123@localhost:8761/eureka

创建配置类WebSecurityConfig

Spring Cloud 2.0 以上的security默认启用了csrf检验，要在eurekaServer端配置security的csrf检验为false，覆盖父类的 configure(HttpSecurity http) 方法，关闭掉 csrf

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
	/**
	 * Spring Cloud 2.0 以上的security默认启用了csrf检验
	 *    	要在eurekaServer端配置security的csrf检验为false
	 *     覆盖父类的 configure(HttpSecurity http) 方法，关闭掉 csrf
	 */
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();
        super.configure(http);
    }
}

修改启动类EurekaApplication，增加@EnableEurekaServer注解开启服务发现服务

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
	
    public static void main( String[] args ){
    	SpringApplication.run(EurekaApplication.class, args);
    }
}

3.搭建微服务消费者 microservice-provider-user

修改pom.xml

	4.0.0
	
	
		com.itmuch.cloud
		microservice-spring-cloud
		0.0.1-SNAPSHOT
	
	
	microservice-provider-user
    jar

	
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter-data-jpa
		
		
			org.springframework.boot
			spring-boot-starter-web
		
		
			com.h2database
			h2
			runtime
			
	

修改application.yml

1. defaultZone: http://user:password123@localhost:8761/eureka 用户名为user 密码为password123
2. prefer-ip-address: true 开启显示IP
3. instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}} 自定义显示格式
4. jpa: 配置JPA打印sql等设置
5. platform: h2 设置数据源为H2数据库
6. schema: classpath:schema.sql   data: classpath:data.sql 加载数据

server:
  port: 7900
spring:
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto:  none
  datasource:
    platform: h2
    schema: classpath:schema.sql
    data: classpath:data.sql
  application: 
    name: microservice-provider-user
eureka:
  client:
    serviceUrl: 
      defaultZone: http://user:password123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

修改启动类，增加@EnableEurekaClient注解表示开启Eureka客户端

@SpringBootApplication
@EnableEurekaClient
public class MicroserviceSimpleProviderUserApplication {

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

}

4.搭建微服务服务者 microservice-consumer-movie

修改pom.xml

	4.0.0
	
	
	
	microservice-consumer-movie
    jar

    
		com.itmuch.cloud
		microservice-spring-cloud
		0.0.1-SNAPSHOT
	
	
	
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter-web
		
		
	

修改启动类，加入@EnableEurekaClient注解开启Eureka客户端服务

@SpringBootApplication
@EnableEurekaClient
public class MicroserviceSimpleConsumerMovieApplication {

	@Bean
	public RestTemplate restTemplate() {
		return new RestTemplate();
	}
	
	public static void main(String[] args) {
		SpringApplication.run(MicroserviceSimpleConsumerMovieApplication.class, args);
	}

}

修改application.yml

spring:
  application: 
    name: microservice-consumer-movie
server:
  port: 7901
user:
  userServicePath: http://localhost:7900/simple/
eureka:
  client:
    serviceUrl: 
      defaultZone: http://user:password123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

测试结果

首先启动microservice-discovery-eureka 再启动microservice-consumer-movie 和microservice-provider-user

输入http://localhost:8761/ 输入用户名和密码正确后，展示Eureka首页。

Instances currently registered with Eureka中已显示注册了2个微服务项目分别是microservice-consumer-movie 和microservice-provider-user，服务发起搭建完成