SpringCloud(Hoxton.SR3)基础篇：第一章、服务发现（Eureka）

一、Eureka简介：
　　Eureka是由Netflix开源的基于REST的服务发现组件,不过出于某种原因2.x以后的版本就停止开源了。Eureka包括Eureka Server（Eureka服务端）和Eucreka Client（Eureka客户端）。
详细的介绍将在提高篇进行说明，本篇主要是帮助大家快速实现Eureka入门案例。

二、Eureka Server搭建（服务注册中心）
2.1搭建Maven父工程

父级pom.xml文件代码

<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>com.qxj</groupId>
    <artifactId>spring-cloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>springcloud-eureka</name>
    <description>演示Eureka</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <!-- 子模块 -->
    <modules>
        <module>springcloud-eureka-service</module>
        <module>consumer-movie</module>
        <module>provider-user</module>
    </modules>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <!-- jdk版本 -->
        <java.version>1.8</java.version>
        <!-- SpringCloud版本号，官方最新稳定版本 -->
        <spring-cloud.version>Hoxton.SR3</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    
    <!--依赖管理，用于管理spring-cloud的依赖 -->
    <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>

2.2搭建EurekaService子工程，采用SpringBoot项目构建

EurekaService的pom.xml文件

<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>

    <artifactId>springcloud-eureka-service</artifactId>
    <packaging>jar</packaging>

    <parent>
        <groupId>com.qxj</groupId>
        <artifactId>spring-cloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- eureka服务端依赖jar包 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <!-- eureka安全组件jar包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
    </dependencies>
</project>

启动主类：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
//该注解表明应用为eureka服务，有可以联合多个服务作为集群，对外提供服务注册以及发现功能
@EnableEurekaServer
public class EurekaApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaApplication.class, args);
    }
}

application.yml配置文件

#安全认证配置
spring:
   security:
      basic:
         enabled: true
      user:
         name: user
         password: password123
server:
   port: 8761
#eureka客户端连接配置
eureka:
   client:
      #是否向服务注册中心注册自己 
      register-with-eureka: false
      #是否检索服务
      fetch-registry: false
      service-url:
         #注册中心地址
         defaultZone: http://user:password123@localhost:8761/eureka

Spring Cloud 2.0 以上的security默认启用了csrf检验，要在eureka server端配置security的csrf检验为false。

import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

/**
 * eureka开启服务无法连接注册中心
 * spring Cloud 2.0 以上 security默认启用了csrf检验，要在eurekaServer端配置security的csrf检验为false
 * @author computer
 *
 */
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter{

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable();
        super.configure(http);
    }
    
}

三、Eureka Client搭建（Eureka客户端）

pom.xml文件

<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>
    
    <artifactId>consumer-movie</artifactId>
    <packaging>jar</packaging>
    
    <parent>
        <groupId>com.qxj</groupId>
        <artifactId>spring-cloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- eureka客户端依赖jar包 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
</project>

启动文件

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
//该注解表明应用既作为eureka实例又为eureka client 可以发现注册的服务
@EnableEurekaClient
public class SimpleConsumerMovieApplication {
    
    public static void main(String[] args) {
        SpringApplication.run(SimpleConsumerMovieApplication.class, args);
    }
}

配置文件application.yml：

server:
  port: 7901
spring:
  application:
      name: consumer-movie
#eureka客户端连接配置
eureka:
   client:
      service-url:
      #注册中心地址
         defaultZone: http://user:password123@localhost:8761/eureka
   instance:
      #将ip注册到eureka上
      prefer-ip-address: true
      #微服务向eureka注册实例名${spring.cloud.client.ip-address} 表示ip地址 spring2.0以上为ip-address
      instance-id: ${spring.application.name}:${spring.cloud.client.ip-address}:${spring.application.instance_id:${server.port}}

四、项目展示

启动流程

先启动
springcloud-eureka-service
再启动
consumer-movie

效果展示

出现上面的效果表示项目成功完成。

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版权声明：本文为CSDN博主「zouhuu」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/zouhuu/java/article/details/83617205

SpringCloud(Hoxton.SR3)基础篇：第一章、服务发现（Eureka）

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