使用SpringCloud-Netflix

時間  2019-11-29
標籤 使用 springcloud netflix 欄目 硅谷 简体版
原文   原文鏈接

目錄css

SpringCloud-Netflix

Spring Cloud 是一個相對比較新的微服務框架，2016 才推出 1.0 的 Release 版本. 可是其更新特別快，幾乎每 1-2 個月就有一次更新，雖然 Spring Cloud 時間最短, 可是相比 Dubbo 等 RPC 框架, Spring Cloud 提供的全套的分佈式系統解決方案。
Spring Cloud 爲開發者提供了在分佈式系統（配置管理，服務發現，熔斷，路由，微代理，控制總線，一次性 Token，全局瑣，Leader 選舉，分佈式 Session，集羣狀態）中快速構建的工具，使用 Spring Cloud 的開發者能夠快速的啓動服務或構建應用、同時可以快速和雲平臺資源進行對接。java

配置統一依賴管理

建立方法，直接建立文件夾而後寫pom.xml
首先建立一個依賴模塊，直接建立文件夾hello-spring-cloud做爲總的工程目錄，而後再在hello-spring-cloud下建立hello-spring-cloud-dependencies做爲全部模塊的父類git

<?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, 設定 JDK 版本 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <showWarnings>true</showWarnings>
                </configuration>
            </plugin>

            <!-- 打包 jar 文件時，配置 manifest 文件，加入 lib 包的 jar 依賴 -->
            <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壓縮) -->
                <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>

        <!-- 資源文件配置 -->
        <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>

建立服務註冊中心

1.在總目錄hello-spring-cloud下新建hello-spring-cloud-eureka目錄，eureka就是服務註冊與發現模塊

配置pom.xmlgithub

<?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>
                    <!--指定啓動的入口類，由於微服務是jar包運行，jar的運行方式：java -jar 入口類名-->
                    <mainClass>com.outlook.liufei32.hello.spring.cloud.eureka.EurekaApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

完善maven結構，並新建出啓動目錄和資源目錄

建立application入口，即jar的啓動類EurekaApplication注意命令格式爲模塊名+application；和配置文件application.yml配置服務註冊
276a7dedba69ffbda6307f05d85a81ec.pngweb

application.ymlspring

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.javaapache

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入口類
 * @Aha-eureka:
 *******************************************************************************/
@SpringBootApplication
@EnableEurekaServer//開啓eureka服務端，全部的服務提供者都要用這個註解註冊到eureka服務端,而服務消費者則是@EnableDiscoveryClient註解
public class EurekaApplication {

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

啓動多個服務提供者提供負載均衡

1.在IDE配置中設置多個實例並行a37768a4e78b397f83a6a9f2b411f715.png
2.再修改配置裏的端口
4d8a7100aad8e6772626311f7be0c32d.png
3.啓動服務的啓動類，就能看到多個實例並行
741bd324f69068b5b0ed33aaf702f012.png瀏覽器

注意事項

注意maven依賴，經常版本不對應會致使服務註冊沒法啓動，包括JDK的版本，我使用Java11沒法啓動，但使用Java8則正常
啓動成功則在瀏覽器中訪問配置的註冊中心IP+端口就能訪問
5c6c4fed80734c96f95e468d79c65754.pngapp

建立服務提供者

建立服務提供者，直接在總包下新建hello-spring-cloud-service-服務模塊名，而後相同的步驟，配置pom.xml導入maven依賴，配置啓動類Application，配置配置文件application.yml負載均衡

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/   #註冊到註冊端

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服務的入口類
 * @Aha-eureka:
 *******************************************************************************/
@SpringBootApplication
@EnableEurekaClient
public class ServiceAdminApplication {
    public static void main( String[] args ) {
        SpringApplication.run(ServiceAdminApplication.class);
    }
}

完成後能夠新建一個controller測試返回，而後在瀏覽器中測試http://localhost:8762/hi?message=wagger-ranger
e11deac6073d417762897fd97d6b7627.png

註冊成功後在服務端的web頁面上就能看到註冊的服務，
當 Client 向 Server 註冊時，它會提供一些元數據，例如主機和端口，URL，主頁等。Eureka Server 從每一個 Client 實例接收心跳消息。 若是心跳超時，則一般將該實例從註冊 Server 中刪除。
abfe6b66759ce3ae3ee40ce1de577f3c.png

建立服務消費者

springcloud-Netflix建立服務消費者

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