spring boot 服务集群负载均衡 springboot项目集群部署

这里使用IDEA构建一个springcloud聚合工程demo
,服务注册与发现组件使用eureka,然后使用ribbon实现客户端负载均衡 在创建工程之前，我是先把eureka服务端给创建好了

1、创建父工程

File–>new–>project,选择spring Initializr

SDK选择自己本地的JDK，可以通过右边的NEW按钮进行选择导入

填写父工程的一些信息，Type选择Maven Project ; 打包方式选择jar; Java Version根据自己本地的java版本进行选择

这里选择需引入的外部依赖Jar包，这里父工程的作用类似于文件夹，来进行版本控制，所以这里不需要引入外部jar包。外部jar包的引入会在子工程的一个公共工程中进行引入

选择该工程存放的位置

创建成功，父工程目录结构如下

.gitignore 用git做版本控制时 用这个文件控制那些文件或文件夹 不被提交（不用git的话可删除 没影响）

HELP.md md是一种文档格式 这个就是你项目的帮助文档（可删除 没影响）

mvnw linux上处理mevan版本兼容问题的脚本（可删除 没影响）

mvnw.cmd windows 上处理mevan版本兼容问题的脚本（可删除 没影响）

spring-boot.iml 是IDEA特有的文件每个导入IDEA的项目都会生成一个项目同名的 .iml文件 用于保存你对这个项目的配置 （删了程序重新导入后还会生成 但由于配置丢失可能会造成程序异常）

这里可以把父工程无用的src目录删除2、在父工程下创建公共工程 common

在父工程名上右键–>new–>Module

这里也不进行jar包的引入，后面会在common工程的pom.xml文件中统一引入jar包依赖。点击next

点击finish，创建成功

common工程pom.xml文件内容如下

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.gmf</groupId>
        <artifactId>gmf-father</artifactId>
        <version>0.0.1</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gmf</groupId>
    <artifactId>common</artifactId>
    <version>${common.version}</version>
    <name>common</name>
    <description>公共工程</description>
    <packaging>jar</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--spring boot依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- 测试类 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <!-- 微服务组件-eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>${spring.cloud.netflix.version}</version>
        </dependency>
        <!-- 微服务组件-ribbon -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>${spring.cloud.netflix.version}</version>
        </dependency>
        <!-- 微服务组件-feign -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>${spring.cloud.netflix.version}</version>
        </dependency>
        <!-- 微服务组件-hystrix -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            <version>${spring.cloud.netflix.version}</version>
        </dependency>
        <!-- 微服务组件-网关 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
            <version>${spring.cloud.netflix.version}</version>
        </dependency>


        <!--数据库-mysql-驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!--SqlServer数据库驱动 -->
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>mssql-jdbc</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!-- mybatis-plus；这里使用的持久层框架是mybatis-plus，是对mybatis的一种封装和拓展，增删改查等操作使用对应的方法即可使用 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-annotation</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-extension</artifactId>
            <version>3.3.2</version>
        </dependency>
        <!-- 工具类-lombok；用在实体类bean上，这里的主要作用是生成bean中的set和get方法；这里需要先在idea里安装lombok插件； -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!-- 热启动 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}-${project.version}</finalName>
    </build>
</project>

这里需要将common的application配置文档改为application-common,方便其他工程引用该配置文件
common工程的application.properties文件内容先设置如下：

#eureka-config
eureka.client.service-url.defaultZone=http://127.0.0.1:10001/eureka
eureka.client.healthcheck.enabled=true
eureka.client.fetch-registry=true
eureka.client.register-with-eureka=true
eureka.client.registry-fetch-interval-seconds=10
eureka.instance.lease-renewal-interval-in-seconds=15
eureka.instance.lease-expiration-duration-in-seconds=30
eureka.instance.hostname=${spring.cloud.client.ip-address}
eureka.instance.instance-id=${spring.cloud.client.ip-address}:${spring.application.name}:${server.port}
eureka.instance.prefer-ip-address=true

#DB-config-mssql
spring.datasource.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.datasource.url=jdbc:sqlserver://127.0.0.1:1433;SelectMethod=cursor;databaseName=TestDB
#spring.datasource.username=eomc
spring.datasource.username=songlp
spring.datasource.password=Aa1qazxsw2!@

#mybatis-plus
mybatis-plus.mapper-locations=classpath:mapping/*.xml
#实体类映射包
mybatis-plus.type-aliases-package=com.gmf.briup.**.entity

3、按照创建common工程的过程 创建order-service01、order-service02工程，来模拟后台服务端集群。再创建一个goods-serbice工程，一个front前端工程，页面都放在front工程下
oreder-service01工程的pom.xml文件如下

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.gmf</groupId>
        <artifactId>gmf-father</artifactId>
        <version>0.0.1</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gmf</groupId>
    <artifactId>order-service01</artifactId>
    <version>${order-service.version}</version>
    <name>order-service01</name> 
    <description>后端订单服务工程01</description>
    <packaging>jar</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- 依赖common工程 -->
        <dependency>
            <groupId>com.gmf</groupId>
            <artifactId>common</artifactId>
            <version>${common.version}</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}-${project.version}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>false</addResources>
                    <includeSystemScope>true</includeSystemScope>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

oreder-service01工程的applicationproperties文件如下

server.port=8091

spring.application.name=order-service

#引用common工程的application配置
spring.profiles.include=common
#可以注册到eureka服务注册中心
eureka.client.enabled=true

order-service02的pom.xml文件内容：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.gmf</groupId>
        <artifactId>gmf-father</artifactId>
        <version>0.0.1</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gmf</groupId>
    <artifactId>order-service02</artifactId>
    <version>${order-service.version}</version>
    <name>order-service02</name>
    <description>后端订单服务工程02</description>
    <packaging>jar</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- 依赖common工程 -->
        <dependency>
            <groupId>com.gmf</groupId>
            <artifactId>common</artifactId>
            <version>${common.version}</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}-${project.version}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>false</addResources>
                    <includeSystemScope>true</includeSystemScope>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

order-service02的application.properties配置文件内容：

server.port=8092

#和order-service01工程的微服务实例名一样，都是order-service,只是端口不一样。
spring.application.name=order-service

#引用common工程的application配置
spring.profiles.include=common
eureka.client.enabled=true

goods-service工程的pom.xml文件如下

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.gmf</groupId>
        <artifactId>gmf-father</artifactId>
        <version>0.0.1</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gmf</groupId>
    <artifactId>goods-service</artifactId>
    <version>${goods-service.version}</version>
    <name>goods-service</name>
    <description>后端商品服务工程</description>
    <packaging>jar</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- 依赖common工程 -->
        <dependency>
            <groupId>com.gmf</groupId>
            <artifactId>common</artifactId>
            <version>${common.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-netflix-eureka-client</artifactId>
            <version>2.2.4.RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}-${project.version}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>false</addResources>
                    <includeSystemScope>true</includeSystemScope>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

goods-service工程的application配置文件内容如下：

server.port=8093

spring.application.name=goods-service

#引用common工程的application配置
spring.profiles.include=common
eureka.client.enabled=true

front前端工程的pom.xml文件如下：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.gmf</groupId>
        <artifactId>gmf-father</artifactId>
        <version>0.0.1</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gmf</groupId>
    <artifactId>front</artifactId>
    <version>${front.version}</version>
    <name>front</name>
    <description>前端工程</description>
    <packaging>jar</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- 依赖common工程 -->
        <dependency>
            <groupId>com.gmf</groupId>
            <artifactId>common</artifactId>
            <version>${common.version}</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>${project.artifactId}-${project.version}</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>false</addResources>
                    <includeSystemScope>true</includeSystemScope>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

front工程的application配置文件内容如下：

server.port=8090

spring.application.name=front

#引用common工程的application配置
spring.profiles.include=common

eureka.client.enabled=true

#thymeleaf页面的配置信息
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.cache=false

各个子工程的pom.xml文件和application文件都基本配置完成，最后配置父工程的pom.xml文件

<?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 https://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>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gmf</groupId>
    <artifactId>gmf-father</artifactId>
    <version>0.0.1</version>
    <name>gmf-father</name>
    <description>父工程</description>
    <packaging>pom</packaging>

    <properties>
    <!--版本控制-->
        <java.version>1.8</java.version>
        <spring.cloud.netflix.version>2.2.4.RELEASE</spring.cloud.netflix.version>
        <common.version>0.0.1</common.version>
        <front.version>0.0.1</front.version>
        <order-service.version>0.0.1</order-service.version>
        <goods-service.version>0.0.1</goods-service.version>
    </properties>
    
    <!--子工程-->
    <modules>
        <module>common</module>
        <module>front</module>
        <module>order-service01</module>
        <module>order-service02</module>
        <module>goods-service</module>
    </modules>


    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <configuration>
                    <delimiters>
                        <delimiter>@</delimiter>
                    </delimiters>
                    <useDefaultDelimiters>false</useDefaultDelimiters>
                </configuration>
            </plugin>
        </plugins>
        <resources>
        <!--可以新建webapp目录，将前端页面资源放到该目录下-->
            <resource>
                <directory>src/main/webapp</directory>
                <includes>
                    <include>**/*</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.yml</include>
                    <include>**/*.yaml</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

    <profiles>
        <profile>
            <id>local</id>
            <properties>
                <spring.active>local</spring.active>
            </properties>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
        </profile>
        <profile>
            <id>dev</id>
            <properties>
                <spring.active>dev</spring.active>
            </properties>
        </profile>
    </profiles>

</project>

各个子工程的启动类上都要添加注解 @EnableEurekaClient；
这里值得注意的是，我们有时并不需要在启动类上标明 @EnableEurekaClien 注解，该微服务也可以注册到eureka服务注册中心，这是因为EurekaClient的注册，其实是和两个配置项有关的，一个是eureka.client.enabled，另一个是spring.cloud.service-registry.auto-registration.enabled，只不过这两个配置默认都是true。所以只要我们不在配置文件里将这两个配置项显示地设置为false，即使不在启动类上标 @EnableEurekaClien 注解，该微服务也可以进行服务注册

4、到这里为止，整个springcloud的架构就基本构建好了

依次启动几个子工程，在浏览器中输入127.0.0.1:10001（或eurekaserver01:10001）或127.0.0.1:10002 进入eureka注册中心查看微服务注册启动成功与否。启动成功的话如下图：

5、在上面搭建的微服务聚合工程中，我们可以做一些简单的springcloud组件应用，包括负载均衡（Ribbon），服务网关(Zuul),服务熔断和降级（Hystrix）等，在后面的博客中，我们会继续完善这些组件的应用