SpringCloud-Netflix

Spring Cloud 是一个相对比较新的微服务框架，2016 才推出 1.0 的 Release 版本. 但是其更新特别快，几乎每 1-2 个月就有一次更新，虽然 Spring Cloud 时间最短, 但是相比 Dubbo 等 RPC 框架, Spring Cloud 提供的全套的分布式系统解决方案。

Spring Cloud 为开发者提供了在分布式系统（配置管理，服务发现，熔断，路由，微代理，控制总线，一次性 Token，全局琐，Leader 选举，分布式 Session，集群状态）中快速构建的工具，使用 Spring Cloud 的开发者可以快速的启动服务或构建应用、同时能够快速和云平台资源进行对接。

配置统一依赖管理

创建方法，直接创建文件夹然后写pom.xml

首先创建一个依赖模块，直接创建文件夹hello-spring-cloud作为总的工程目录，然后再在hello-spring-cloud下创建hello-spring-cloud-dependencies作为所有模块的父类

<?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 http://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>2.0.3.RELEASE</version>

    </parent>

    <groupId>com.outlook.liufei32</groupId>

    <artifactId>hello-spring-cloud-dependencies</artifactId>

    <version>1.0.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <name>hello-spring-cloud-dependencies</name>

    <url>https://github.com/Swagger-Ranger</url>

    <inceptionYear>2018-Now</inceptionYear>

    <properties>

        <!-- Environment Settings -->

        <java.version>1.11</java.version>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <!-- Spring Settings -->

        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>

    </properties>

    <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>

            <!-- Compiler 插件, 设定 JDK 版本 -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <showWarnings>true</showWarnings>

                </configuration>

            </plugin>

            <!-- 打包 jar 文件时，配置 manifest 文件，加入 lib 包的 jar 依赖 -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-jar-plugin</artifactId>

                <configuration>

                    <archive>

                        <addMavenDescriptor>false</addMavenDescriptor>

                    </archive>

                </configuration>

                <executions>

                    <execution>

                        <configuration>

                            <archive>

                                <manifest>

                                    <!-- Add directory entries -->

                                    <addDefaultImplementationEntries>true</addDefaultImplementationEntries>

                                    <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>

                                    <addClasspath>true</addClasspath>

                                </manifest>

                            </archive>

                        </configuration>

                    </execution>

                </executions>

            </plugin>

            <!-- resource -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-resources-plugin</artifactId>

            </plugin>

            <!-- install -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-install-plugin</artifactId>

            </plugin>

            <!-- clean -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-clean-plugin</artifactId>

            </plugin>

            <!-- ant -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-antrun-plugin</artifactId>

            </plugin>

            <!-- dependency -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-dependency-plugin</artifactId>

            </plugin>

        </plugins>

        <pluginManagement>

            <plugins>

                <!-- Java Document Generate -->

                <plugin>

                    <groupId>org.apache.maven.plugins</groupId>

                    <artifactId>maven-javadoc-plugin</artifactId>

                    <executions>

                        <execution>

                            <phase>prepare-package</phase>

                            <goals>

                                <goal>jar</goal>

                            </goals>

                        </execution>

                    </executions>

                </plugin>

                <!-- YUI Compressor (CSS/JS压缩) -->

                <plugin>

                    <groupId>net.alchim31.maven</groupId>

                    <artifactId>yuicompressor-maven-plugin</artifactId>

                    <version>1.5.1</version>

                    <executions>

                        <execution>

                            <phase>prepare-package</phase>

                            <goals>

                                <goal>compress</goal>

                            </goals>

                        </execution>

                    </executions>

                    <configuration>

                        <encoding>UTF-8</encoding>

                        <jswarn>false</jswarn>

                        <nosuffix>true</nosuffix>

                        <linebreakpos>30000</linebreakpos>

                        <force>true</force>

                        <includes>

                            <include>**/*.js</include>

                            <include>**/*.css</include>

                        </includes>

                        <excludes>

                            <exclude>**/*.min.js</exclude>

                            <exclude>**/*.min.css</exclude>

                        </excludes>

                    </configuration>

                </plugin>

            </plugins>

        </pluginManagement>

        <!-- 资源文件配置 -->

        <resources>

            <resource>

                <directory>src/main/java</directory>

                <excludes>

                    <exclude>**/*.java</exclude>

                </excludes>

            </resource>

            <resource>

                <directory>src/main/resources</directory>

            </resource>

        </resources>

    </build>

    <repositories>

        <repository>

            <id>aliyun-repos</id>

            <name>Aliyun Repository</name>

            <url>http://maven.aliyun.com/nexus/content/groups/public</url>

            <releases>

                <enabled>true</enabled>

            </releases>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>sonatype-repos</id>

            <name>Sonatype Repository</name>

            <url>https://oss.sonatype.org/content/groups/public</url>

            <releases>

                <enabled>true</enabled>

            </releases>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>sonatype-repos-s</id>

            <name>Sonatype Repository</name>

            <url>https://oss.sonatype.org/content/repositories/snapshots</url>

            <releases>

                <enabled>false</enabled>

            </releases>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </repository>

    </repositories>

    <pluginRepositories>

        <pluginRepository>

            <id>aliyun-repos</id>

            <name>Aliyun Repository</name>

            <url>http://maven.aliyun.com/nexus/content/groups/public</url>

            <releases>

                <enabled>true</enabled>

            </releases>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </pluginRepository>

    </pluginRepositories>

</project>

创建服务注册中心

1.在总目录hello-spring-cloud下新建hello-spring-cloud-eureka目录，eureka就是服务注册与发现模块

配置pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>com.outlook.liufei32</groupId>

        <artifactId>hello-spring-cloud-dependencies</artifactId>

        <version>1.0.0-SNAPSHOT</version>

        <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath>

    </parent>

    <artifactId>hello-spring-cloud-eureka</artifactId>

    <packaging>jar</packaging>

    <name>hello-spring-cloud-eureka</name>

    <url>https://github.com/Swagger-Ranger</url>

    <inceptionYear>2018-Now</inceptionYear>

    <dependencies>

        <!-- Spring Boot Begin -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <!-- Spring Boot End -->

        <!-- Spring Cloud Begin -->

        <dependency>

            <!--<groupId>org.springframework.cloud</groupId>-->

            <!--<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>-->

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-eureka-server</artifactId>

            <version>1.4.0.RELEASE</version>

        </dependency>

        <!-- Spring Cloud End -->

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <!--指定启动的入口类，因为微服务是jar包运行，jar的运行方式：java -jar 入口类名-->

                    <mainClass>com.outlook.liufei32.hello.spring.cloud.eureka.EurekaApplication</mainClass>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

完善maven结构，并新建出启动目录和资源目录

创建application入口，即jar的启动类EurekaApplication注意命令格式为模块名+application；和配置文件application.yml配置服务注册

application.yml

spring:

  application:

    name: hello-spring-cloud-eureka

server:

  port: 8761

eureka:

  instance:

    hostname: localhost

  client:

    registerWithEureka: false

    fetchRegistry: false

    serviceUrl:

      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

EurekaApplication.java

package com.outlook.liufei32.hello.spring.cloud.eureka;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/*******************************************************************************

 * @Copyright (C), 2018-2019,github:Swagger-Ranger

 * @FileName: EurekaApplication

 * @Author: liufei32@outlook.com

 * @Date: 2019/4/2 11:01

 * @Description: eureka入口类

 * @Aha-eureka:

 *******************************************************************************/

@SpringBootApplication

@EnableEurekaServer//开启eureka服务端，所有的服务提供者都要用这个注解注册到eureka服务端,而服务消费者则是@EnableDiscoveryClient注解

public class EurekaApplication {

    public static void main( String[] args ) {

        SpringApplication.run(EurekaApplication.class);

    }

}

启动多个服务提供者提供负载均衡

1.在IDE配置中设置多个实例并行

2.再修改配置里的端口



3.启动服务的启动类，就能看到多个实例并行

注意事项

注意maven依赖，常常版本不对应会导致服务注册无法启动，包括JDK的版本，我使用Java11无法启动，但使用Java8则正常

启动成功则在浏览器中访问配置的注册中心IP+端口就能访问

创建服务提供者

创建服务提供者，直接在总包下新建hello-spring-cloud-service-服务模块名，然后相同的步骤，配置pom.xml导入maven依赖，配置启动类Application，配置配置文件application.yml

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>com.outlook.liufei32</groupId>

        <artifactId>hello-spring-cloud-dependencies</artifactId>

        <version>1.0.0-SNAPSHOT</version>

        <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath>

    </parent>

    <artifactId>hello-spring-cloud-service-admin</artifactId>

    <packaging>jar</packaging>

    <name>hello-spring-cloud-service-admin</name>

    <url>https://github.com/Swagger-Ranger</url>

    <inceptionYear>2019-Now</inceptionYear>

    <dependencies>

        <!-- Spring Boot Begin -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <!-- Spring Boot End -->

        <!-- Spring Cloud Begin -->

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

        </dependency>

        <!-- Spring Cloud End -->

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <mainClass>com.outlook.liufei32.hello.spring.cloud.service.admin.ServiceAdminApplication</mainClass>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

application.yml

spring:

  application:

    name: hello-spring-cloud-service-admin

server:

  port: 8762

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:8761/eureka/   #注册到注册端

ServiceAdminApplication.java

package com.outlook.liufei32.hello.spring.cloud.service.admin;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/*******************************************************************************

 * @Copyright (C), 2018-2019,github:Swagger-Ranger

 * @FileName: ServiceAdminApplication

 * @Author: liufei32@outlook.com

 * @Date: 2019/4/2 15:25

 * @Description: admin服务的入口类

 * @Aha-eureka:

 *******************************************************************************/

@SpringBootApplication

@EnableEurekaClient

public class ServiceAdminApplication {

    public static void main( String[] args ) {

        SpringApplication.run(ServiceAdminApplication.class);

    }

}

完成后可以新建一个controller测试返回，然后在浏览器中测试http://localhost:8762/hi?message=wagger-ranger

注册成功后在服务端的web页面上就能看到注册的服务，

当 Client 向 Server 注册时，它会提供一些元数据，例如主机和端口，URL，主页等。Eureka Server 从每个 Client 实例接收心跳消息。 如果心跳超时，则通常将该实例从注册 Server 中删除。

创建服务消费者

springcloud-Netflix创建服务消费者

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