Shang Silicon Valley Zhouyang learning micro service

Understanding microservices

1, General construction works

In this step, you'd better download maven yourself, which is higher than version 3.5.2

Delete src folder and join pom

Set encoding

Set file display filter (optional)

Select java 8

Hook up, hook up

2, Add dependency configuration to parent project pom file

1. Add dependency

1. Uniformly manage Jar package version

<!-- Unified management Jar Package version-->
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <junit.version>4.12</junit.version>
    <log4j.version>1.2.17</log4j.version>
    <lombok.version>1.16.18</lombok.version>
    <mysql.version>5.1.47</mysql.version>
    <druid.version>1.1.16</druid.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
  </properties>

2. After the sub module inherits, it provides the following functions: locking version + sub modlue without writing groupId and version

dependencyManagement

<!-- After the sub module inherits, it provides the following functions: locking the version + son modlue Do not write groupId and version -->
  <dependencyManagement>
    <dependencies>

      <!-- spring boot 2.2.2-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.2.2.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!--spring cloud Hoxton.SR1-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Hoxton.SR9</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!-- spring cloud alibaba 2.1.0.RELEASE -->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>2.1.0.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>

      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${druid.version}</version>
      </dependency>

      <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis.spring.boot.version}</version>
      </dependency>
    </dependencies>

  </dependencyManagement>

3.plugin

<build>
     <plugins>
       <plugin>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
         <configuration>
           <fork>true</fork>
           <addResources>true</addResources>
         </configuration>
       </plugin>
     </plugins>
  </build>

2. Added pom file code

<?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>

  <groupId>com.atguigu.springcloud</groupId>
  <artifactId>cloud2020</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <!-- Unified management Jar Package version-->
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <junit.version>4.12</junit.version>
    <log4j.version>1.2.17</log4j.version>
    <lombok.version>1.16.18</lombok.version>
    <mysql.version>5.1.47</mysql.version>
    <druid.version>1.1.16</druid.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
  </properties>

  <!-- After the sub module inherits, it provides the following functions: locking the version + son modlue Do not write groupId and version -->
  <dependencyManagement>
    <dependencies>

      <!-- spring boot 2.2.2-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.2.2.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!--spring cloud Hoxton.SR1-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Hoxton.SR9</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <!-- spring cloud alibaba 2.1.0.RELEASE -->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>2.1.0.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>

      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${druid.version}</version>
      </dependency>

      <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis.spring.boot.version}</version>
      </dependency>
    </dependencies>

  </dependencyManagement>


  <build>
     <plugins>
       <plugin>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
         <configuration>
           <fork>true</fork>
           <addResources>true</addResources>
         </configuration>
       </plugin>
     </plugins>
  </build>
</project>

3. What is dependency management

maven uses the dependencyManagement element to provide a way to manage dependent version numbers.

Usually you will see the dependency management element in the parent POM at the top level of an organization or project.

Using the dependencyManagement element in pom.xml allows all to reference a dependency in a subproject without explicitly listing the version number. Maven will go up the parent-child hierarchy until it finds a project with a dependency management element, and then it will use the version number specified in the dependency management element.

The advantage of this is: if multiple sub projects reference the same dependency, you can avoid declaring a version number in each used sub project. In this way, when you want to upgrade or switch to another version, you only need to update in the top-level parent container without modifying one sub project; In addition, if a sub project needs another version, you only need to declare version.

be careful

Dependency management only declares dependencies and does not implement reference A. therefore, the dependencies required for the declarations to be displayed in the subproject.

If the dependency is not declared in the child project, it will not be inherited from the parent; Only when the dependency is written in the child project and no specific version is specified, the item will be inherited from the parent project, and both version and scope are read from the parent pom;

If the version number is specified in the subproject, the jar version specified in the subproject is used.

4. Skipping unit tests in maven

2, Establish sub project (payment module)

1. Right click the parent project to create a new module

2. Enter artifactid: cloud provider payment8001

3. Note here that Module name: the - sign will be removed by default

4. Sub project pom document code

<?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>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8001</artifactId>

    <dependencies>
        <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.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>


</project>

5. Write the application.yml configuration file

server:
  port: 8001


spring:
  application:
    name: cloud-payment-service

  datasource:
    type: com.alibaba.druid.pool.DruidDataSource     #Current data source operation type
    driver-class-name: org.gjt.mm.mysql.Driver       # mysql driver package
    url: jdbc:mysql://localhost:3306/db2019?useUnicode-true&characterEncoding-utf-8&usessL=false
    username: root
    password: root


mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.atguigu.springcloud.entities   #Package of all Entity alias classes

6. Prepare sub project startup class com.atguigu.springcloud.PaymentMain8001

6.1 startup code

package com.atguigu.springcloud;

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

/**
 * @auth Baiqing Wu
 * @create 2021-10-27 0:04
 * @className com.atguigu.springcloud.PaymentMain8001
 * @versions 1.0
 */

@SpringBootApplication
public class PaymentMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class,args);
    }
}

Tags: Spring Cloud Microservices

Posted on Tue, 26 Oct 2021 11:54:46 -0400 by marky2coats

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