一、SpringCloud_Alibaba项目搭建

1. 搭建父工程

eclipse --> file --> new --> Maven project

搭建父工程
删除src目录
修改pom文件

指定父工程

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.13.RELEASE</version>
    <relativePath/>
</parent>

依赖版本锁定

  <!-- 依赖版本管理 -->
  <!-- spring-cloud版本可以去 https://start.spring.io 根据springBoot自己查看-->
  <!-- 也可以在spring cloud alibaba 的文档中查看 spring cloud alibaba、spring cloud和spring boot的版本对应关系： https://github.com/alibaba/spring-cloud-alibaba/wiki/版本说明-->
  <properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-cloud.version>Greenwich.SR5</spring-cloud.version>
    <spring-cloud-alibaba.version>2.1.0.RELEASE</spring-cloud-alibaba.version>
  </properties>
  <dependencyManagement>
  <dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${spring-cloud.version}</version>
        <type>pom</type>
        <scope>import</scope>
    </dependency>
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>${spring-cloud-alibaba.version}</version>
        <type>pom</type>
        <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

最终父工程pom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>

<groupId>com.test</groupId>
<artifactId>springcloud-alibaba</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>springcloud-alibaba</name>
<description>springcloud-alibaba 学习</description>

<!-- 父工程 -->
<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.14.RELEASE</version>
  <relativePath/>
</parent>

<!-- 依赖版本管理 -->
<!-- spring-cloud版本可以去 https://start.spring.io 根据springBoot自己查看 -->
<!-- 也可以在spring cloud alibaba 的文档中查看 spring cloud alibaba、spring cloud和spring boot的版本对应关系： https://github.com/alibaba/spring-cloud-alibaba/wiki/版本说明-->
<!-- 新版本spring cloud alibaba-2023.0.x各组件版本和配置还是需要看新的文档，免的入坑： https://sca.aliyun.com/docs/2023/overview/what-is-sca/ -->
<properties>
  <java.version>1.8</java.version>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <spring-cloud.version>Greenwich.SR5</spring-cloud.version>
  <spring-cloud-alibaba.version>2.1.2.RELEASE</spring-cloud-alibaba.version>
</properties>
<dependencyManagement>
  <dependencies>
      <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-dependencies</artifactId>
          <version>${spring-cloud.version}</version>
          <type>pom</type>
          <scope>import</scope>
      </dependency>
      <dependency>
          <groupId>com.alibaba.cloud</groupId>
          <artifactId>spring-cloud-alibaba-dependencies</artifactId>
          <version>${spring-cloud-alibaba.version}</version>
          <type>pom</type>
          <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
 </project>

创建基础模块 -- common（存放实体类）

创建maven项目

修改pom文件

<?xml version="1.0"?>
<project
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
  xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.test</groupId>
    <artifactId>springcloud-alibaba</artifactId>
    <version>1.0.0-SNAPSHOT</version>
  </parent>
  <artifactId>shop-common</artifactId>
  <name>shop-common</name>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!-- Mybatis-Plus -->
    <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-generator</artifactId>
        <version>3.3.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity-engine-core</artifactId>
        <version>2.2</version>
    </dependency>
    <!-- hutool -->
    <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.3.5</version>
    </dependency>
    <!--引入swagger -->
    <!-- 排除springfox-swagger2 引入的swagger-annotations、swagger-models 1.5.20版本，手动引入1.5.21版本的jar, 
        在使用@ApiModelProperty注解在字段上时，如果字段的类型为Long或是int类型， 那么程序启动后，访问swagger-ui.html的页面，程序会报错: 
        java.lang.NumberFormatException: For input string: "" -->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>2.9.2</version>
        <exclusions>
            <exclusion>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-annotations</artifactId>
            </exclusion>
            <exclusion>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-models</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>2.9.2</version>
    </dependency>
    <dependency>
        <groupId>io.swagger</groupId>
        <artifactId>swagger-annotations</artifactId>
        <version>1.5.21</version>
    </dependency>
    <dependency>
        <groupId>io.swagger</groupId>
        <artifactId>swagger-models</artifactId>
        <version>1.5.21</version>
    </dependency>
    <!-- druid -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.22</version>
    </dependency>
  </dependencies>
</project>

创建业务微服务模块

创建maven moudle模块
导入依赖

```
<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.test</groupId>
  <artifactId>springcloud-alibaba</artifactId>
  <version>1.0.0-SNAPSHOT</version>
</parent>
<artifactId>shop_product</artifactId>
<name>shop_product</name>
<description>商品微服务</description>

<dependencies>
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
  </dependency>
  <dependency>
      <groupId>com.test</groupId>
      <artifactId>shop-common</artifactId>
      <version>1.0.0-SNAPSHOT</version>
  </dependency>
  <!-- log4j2出现漏洞，就别用了，先用 自带logback吧，配置参考：https://www.jianshu.com/p/bf7bd863637e -->
  <!-- Spring Boot官方文档中解释，在启用spring-boot-starter后会默认使用logback作为日志框架， 
        本项目选用log4j2,因此需要全局exclude掉Spring Boot默认日志 -->
   <!-- <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-web</artifactId>
    </dependency>  -->
  </dependencies>
</project>
```

创建SpringBoot主类

package com.test.shop.product;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ShopProductApplication {

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

 }

}

添加配置文件

# server
server:
port: 8011
servlet:
  context-path: /shop-product
# log4j2
logging:
config: classpath:conf/log4j2.xml
level:
  com.test.shop.product.dao: debug
  
# spring
spring: 
profiles:
  active: dev
# spring注册MBean
jmx:
  # jmx管理bean，开启
  enabled: true
  server: mbeanServer
  # 每个项目对应的jmx域名
  default-domain: shop-product
#devtools  -- SpringBoot 热部署插件 devtools ,同时启动多个Application时，控制台会报警告
devtools:
  livereload:
    port: 35736

# mybatis
mybatis-plus:  
type-aliases-package: com.test.shop.common.entity
  # 指定mybatis映射文件的位置
mapper-locations: classpath:mapper/*.xml
configuration: 
  # 开启驼峰命名转换（开启后需要注意字段写法，不然返回值为null）
  map-underscore-to-camel-case: true
global-config:
  db-config:
    id-type: AUTO

创建必要的接口和实现类(controller service dao)