【SpringCloud】微服务架构编码构建

微服务架构编码构建

约定>配置>编码

Mysql的主从

slave会从master读取binlog来进行数据同步

三步骤+原理图

MySQL复制过程分成三步：

1. master将改变记录到二进制日志（binary log）。这些记录过程叫做二进制日志事件，binary log events；
2. slave将master的binary log events拷贝到它的中继日志（relay log）；
3. slave重做中继日志中的事件，将改变应用到自己的数据库中。 MySQL复制是异步的且串行化的

IDEA新建project工作空间

微服务cloud整体聚合工程

父工程步骤

父工程的打包方式为 pom，父工程只需要保留 pom.xml 文件即可

1.New Project

2.聚合总父工程名字

3. Maven选版本

4. 工程名字

5. 字符编码

6. 注解生效激活

7. java编译版本选8

8.File Type过滤

父工程POM

<?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>

    <!--统一管理jar包版本-->
    <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>8.0.19</mysql.version>
        <druid.version>1.1.16</druid.version>
        <spring.boot.version>2.2.2.RELEASE</spring.boot.version>
        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
        <spring.cloud.alibaba.version>2.1.0.RELEASE</spring.cloud.alibaba.version>
        <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
    </properties>

    <!--子模块继承后,提供作用:锁定版本+子module不用groupId和version-->
    <dependencyManagement>
        <dependencies>
            <!--springboot 2.2.2-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--Spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</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>${spring.cloud.alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </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>

    <!--第三方maven私服-->
    <repositories>
        <repository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

Maven工程落地细节复习

Maven中的DependencyManagement和Dependencies

dependencyManagement

Maven使用dependencyManagement元素来提供了-种管理依赖版本号的方式。
通常会在一个 组织或者项目的最顶层的父POM中看到dependencyManagement元素。
使用pom.xml中的dependencyManagement元索能让所有在子项目中引用一个依赖而不用显式的列出版本号。
Maven会沿着父子层次向上走，直到找到-个拥有dependencyManagement元索的项目，然后它就会使用这个dependencyManagement元素中指定的版本号。

例如在父项目里:

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.2</version>
    </dependency>
  </dependencies>
</dependencyManagement>

然后在子项目里就可以添加mysql-connector时可以不指定版本号，例如：

<dependencies>
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
  </dependency>
</dependencies>

这样做的好处就是: 如果有多个子项目都引用同一样的依赖,则可以避免在每个使用的子项目里都声明一个版本号,这样想升级或切换到另一个版本时,只需在顶层父容器里更新,而不需要一个一个子项目的修改l;另外如果某个子项目需要另外的一个版本,只需声明version版本。

dependencyManagement里只是声明依赖，并不实现引入，因此子项目需要显示的声明需要用的依赖。

maven中跳过单元测试

父工程创建完成执行mvn:insall将父工程发布到仓库方便子工程继承

Rest微服务工程搭建

构建步骤

1. 建module
2. 改POM
3. 写YML
4. 主启动
5. 业务类

1.Cloud-provider-payment8001 微服务提供者Module模块

1 建module

建cloud-provider-payment8001

创建完成后回到父工程查看pom文件变化

2 改POM

3 写YML

server:
  port: 8001

spring:
  application:
    name: cloud-payment-service
  datasource:
    # 当前数据源操作类型
    type: com.alibaba.druid.pool.DruidDataSource
    # mysql驱动类
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8
    username: root
    password: root

mybatis:
  mapper-locations: classpath*:mapper/*.xml
  type-aliases-package: com.atguigu.springcloud.entities

4 主启动

5 业务类

1.建表sql

CREATE TABLE `payment`(
     `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
      `serial` varchar(200) DEFAULT '',
      PRIMARY KEY(`id`)
)  ENGINE = InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

2.entities

主实体Payment

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {

    private Long id;
    private String serial;
}

Json封装体CommonResult

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    // 404 not found
    private Integer code;
    private String message;
    private T       data;

    public CommonResult(Integer code,String message){
        this(code,message,null);
    }
}

3.dao

接口PaymentDao

@Mapper
public interface PaymentDao {

    public int create(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);
}

mybatis的映射文件PaymentMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.atguigu.springcloud.dao.PaymentDao">
    <insert id="create" parameterType="com.atguigu.springcloud.entities.Payment" useGeneratedKeys="true"
            keyProperty="id">
        insert into payment (serial) values (#{serial});
    </insert>
 
    <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <id column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>
 
    <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
        select * from payment where id = #{id};
    </select>
</mapper>

4.service

接口PaymentService

public interface PaymentService {

    public int create(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);
}

实现类

@Service
public class PaymentServiceImpl implements PaymentService {

    @Resource
    private PaymentDao paymentDao;

    public int create(Payment payment){
        return paymentDao.create(payment);
    }

    public Payment getPaymentById(Long id){
        return paymentDao.getPaymentById(id);
    }
}

5.controller

@RestController
@Slf4j
public class PaymentController {

    @Resource
    private PaymentService paymentService;

    @PostMapping(value="/payment/create")
    public CommonResult create(Payment payment) {
        int result = paymentService.create(payment);
        log.info("****插入结果:" + result);

        if(result > 0){
            return  new CommonResult(200,"插入数据库成功",result);
        } else {
            return new CommonResult(444,"插入数据库失败",null);
        }
    }

    @GetMapping(value="/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id) {
        Payment payment = paymentService.getPaymentById(id);
        log.info("****插入结果:" + payment);

        if(payment != null){
            return  new CommonResult(200,"查询成功",payment);
        } else {
            return new CommonResult(444,"没有对应记录，查询ID: " + id,null);
        }
    }
}

测试

http://localhost:8001/payment/get/31

postman模拟post

运行
通过修改idea的workspace.xml的方式快速打开Run Dashboard窗口
你自己路径 E:IdeaWorkspacespringcloud_sellcloud2020.idea

<option name="configurationTypes">
  <set>
      <option value="SpringBootApplicationConfigurationType" />
   </set>
</option>

添加代码块

开启Run DashBoard

部分同学可能由于idea版本不同,需要关闭重启

小总结

1. 建module
2. 改POM
3. 写YML
4. 主启动
5. 业务类

2.热部署Devtools

1.Adding devtools to your project

<!--热部署-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <scope>runtime</scope>
    <optional>true</optional>
</dependency>

2.Adding plugin to your pom.xml

注意是你的父工程POM下
<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>

3.Enabling automatic build

4. Update the value of

CTRL+SHIFT + ALT + /
打开上面的这个界面，选择 registry
主要是打开 compiler.aotomake.allow.when.app.running

5.重启idea

3.cloud-consumer-order80 微服务消费者订单Module模块

建cloud-consumer-order80

改POM

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--监控-->
    <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>
    <!--eureka client-->
    <!--<dependency>-->
    <!--<groupId>org.springframework.cloud</groupId>-->
    <!--<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>-->
    <!--</dependency>-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <!--如果没写版本,从父层面找,找到了就直接用,全局统一-->
    </dependency>
    <!--mysql-connector-java-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!--jdbc-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <!--热部署-->
    <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>

注意你前期跟着做项目，如果没有用到dao层和相关配置，记得把POM.xml中 mybatis和 mysql的注释掉

写YML

主启动

@SpringBootApplication
public class OrderMain80 {

    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class,args);
    }
}

业务类

entites

entities-与服务提供者一样

首说Resttemplate

是什么

RestTemplate提供了多种便携访问远程Http服务的方法
是一种简单便携的访问Restful服务模板类，是Spring提供的用于访问Rest服务的客户端模板工具集

官方使用

官网地址：
https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html

使用restTemplate访问restful接口非常的简单粗暴无脑。
(urI, requestMap, ResponseBean.class)这三个参数分别代表
REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。

config配置类

ApplicationContextConfig

@Configuration
public class ApplicationContextConfig {

    @Bean
    public RestTemplate getRestTemplate() {
        return  new RestTemplate();
    }
}

controller

@RestController
@Slf4j
public class OrderController {

    public static final String PAYMENT_URL = "http://localhost:8001";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult< Payment > create(Payment payment) {
        return  restTemplate.postForObject(PAYMENT_URL + "/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id")Long id) {
        return  restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }
}

测试

http://localhost/consumer/payment/get/1

不要忘记@RequestBody注解

@RequestBody主要用来接收前端传递给后端的json字符串中的数据的(请求体中的数据的)；

4. 工程重构

观察问题

系统中有重复部分,重构

新建

cloud-api-common 存放公共依赖，父工程的打包方式为 pom，父工程只需要保留 pom.xml 文件即可。

POM

<dependencies>
    <!--热部署-->
    <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>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.1.0</version>
    </dependency>
</dependencies>

entities

Payment实体

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {

    private Long id;
    private String serial;
}

CommonResult通用封装类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    // 404 not found
    private Integer code;
    private String message;
    private T       data;

    public CommonResult(Integer code,String message){
        this(code,message,null);
    }
}

maven命令clean install

订单80和支付8001分别改造

删除各自的原先的entities文件夹

各自粘贴POM内容

<dependency>
     <groupId>com.eiletxie.springcloud</groupId>
     <artifactId>cloud-api-commons/artifactId>
     <version>${project.version}</version>
</dependency>

目前工程样图