**从零开始完成微服务项目乐优商城**

第一篇：搭建微服务框架

1、新建maven项目，配置Pom.xml文件，用于统一管理依赖。pom文件配置如下：

<groupId>com.leyou.parent</groupId>
<artifactId>leyou</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>pom</packaging>

<name>leyou</name>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
    <relativePath/><!--look parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <spring-cloud.version>Finchley.RC1</spring-cloud.version>
    <mybatis.starter.version>1.3.2</mybatis.starter.version>
    <mapper.starter.version>2.0.2</mapper.starter.version>
    <mysql.version>5.1.32</mysql.version>
    <pageHelper.starter.version>1.2.3</pageHelper.starter.version>
    <leyou.latest.version>1.0.0-SNAPSHOT</leyou.latest.version>
    <fastDFS.client.version>1.26.1-RELEASE</fastDFS.client.version>
</properties>

<dependencyManagement>
    <dependencies>
        <!--spring cloud-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring-cloud.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <!--mybatis启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.starter.version}</version>
        </dependency>
        <!--通用mapper启动器-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>${mapper.starter.version}</version>
        </dependency>
        <!--分页助手启动器-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>${pageHelper.starter.version}</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <!--FastDFS客户端-->
        <dependency>
            <groupId>com.github.tobato</groupId>
            <artifactId>fastdfs-client</artifactId>
            <version>${fastDFS.client.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

<repositories>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>

2、在父工程下新建ly-registry模块，在pom中引入eureka依赖（spring-cloud-starter-netflix-eureka-server），新增启动类，设置注解（@SpringBootApplication，@EnableEurekaServer），新增application.yml，设置内容如下：

server:
port: 10086
spring:
application:
name: ly-registry
eureka:
client:
fetch-registry: false
register-with-eureka: false
service-url:
defaultZone: http://127.0.0.1:10086/eureka
server:
enable-self-preservation: false
eviction-interval-timer-in-ms: 5000

3、在父工程下新建ly-gateway模块，在pom中分别引入cloud下的eureka和zuul依赖（spring-cloud-starter-netflix-eureka-client和spring-cloud-starter-netflix-zuul）以及boot的下的监控依赖(spring-boot-starter-actuator），新增启动类，添加注解（@SpringBootApplication，@EnableDiscoveryClient，@EnableZuulProxy），配置application.yml如下：

server:
port: 10010
spring:
application:
name: api-gateway
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:10086/eureka
registry-fetch-interval-seconds: 5
instance:
instance-id: $spring.application.name:${server.port}
prefer-ip-address: true #当你获取host时，返回的不是主机名，而是ip
ip-address: 127.0.0.1
zuul:
prefix: /api #添加路由前缀
retryable: true
routes:
item-service: /item/**
ribbon:
ConnectTimeout: 250 #连接超时时间(ms)
ReadTimeout: 2000 #通信超时时间(ms)
OkToRetryOnAllOperations: true #是否对所有操作重试
MaxAutoRetriesNextServer: 1#同一服务不同实例的重试次数
MaxAutoRetries: 1#同一实例的重试次数
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMillisecond: 10000 #熔断超时时长:10000ms

3、新建ly-item模块，在该模块下新建ly-item-interface和ly-item-service模块，引入配置文件如下：

<groupId>com.leyou.service</groupId>
<artifactId>ly-item</artifactId>
<packaging>pom</packaging>
<modules>
    <module>ly-item-interface</module>
    <module>ly-item-service</module>
</modules>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
</dependencies>