Spring Cloud 简介和工程初始化

Cloud第二代微服务技术栈

图一


项目的版本选择

https://start.spring.io/actuator/info

https://cloud.spring.io/spring-cloud-static/Hoxton.SR3/reference/html/spring-cloud.html


项目构建原则

约定 > 配置 > 编码

具体步骤：

建模块 –> 改pom –> 写yml –> 主启动 –> 业务类


工程构建


IDEA集成环境设置

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1）新建工程
2）聚合总父工程名称
3）maven版本
4）工程名称
5）字符编码设置 Editor->FileEncoding
6）注解生效设置 Build->Annotation Processors->Enable Annotation Processing
7）java编译版本设置 Build->Java Compiler
8）File Type 过滤设置等 Editor->File Types


版本约定：

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<!--spring boot-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.2.5.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>

<!--spring cloud，基于spring boot基础玩儿-->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-dependencies</artifactId>
  <version>Hoxton.SR3</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>

<!--spring cloud alibaba，基于spring cloud基础玩儿-->
<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-alibaba-dependencies</artifactId>
  <version>2.2.0.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>


基本工程依赖：

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<?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">
    <parent>
        <artifactId>zdemo-springcloud-02</artifactId>
        <groupId>com.keyllo.demo</groupId>
        <version>1.0</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>zdemo-springcloud-payment-8001</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
      
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

    <!--构建管理-->
    <build>
        <resources>
            <resource>
                <!--
                很关键，不然可能报如下异常 
                Error creating bean with name dataSource，
                Unable to start embedded Tomcat
                -->
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
                <includes>
                    <include>**/*.yml</include>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>


基本配置：

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server:
  port: 8001

spring:
  application:
    name: payment-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://host-rdbms:3306/test01?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
    username: root
    password: 123456

mybatis:
  mapper-locations: classpath:/mapper/*.xml
  type-aliases-package: springcloud02.payment.module


开发时热部署的设置

第一步：在父工程引入jar包和插件

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<!--引入jar包-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-devtools</artifactId>
  <scope>runtime</scope>
  <optional>true</optional>
</dependency>

<!--引入插件-->
<plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  <configuration>
    <fork>true</fork>
    <addResources>true</addResources>
  </configuration>
</plugin>


第二步：开启idea自动编译选项


第三步：打开Maintenance对话框，勾选下面两个选项


第四步：重启idea，OK，大功告成！

注意：热部署设置只能在项目开发阶段使用！


使用 Run Dashboard 调试微服务

如果你的idea中没有自动出现Run Dashboard的界面，莫慌，粘贴如下代码到你的项目 .idea/workspace.xml ，重启idea，大功告成！

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<component name="RunDashboard">
  <option name="configurationTypes">
    <set>
      <option value="SpringBootApplicationConfigurationType" />
    </set>
  </option>
  <option name="ruleStates">
    <list>
      <RuleState>
        <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
      </RuleState>
      <RuleState>
        <option name="name" value="StatusDashboardGroupingRule" />
      </RuleState>
    </list>
  </option>
  <option name="contentProportion" value="0.17384952" />
</component>