02_父工程Project构建

工程目录如下图所示：

1 cloud2020构建

1.1 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.hlg.springcloud</groupId>
  <artifactId>cloud2020</artifactId>
  <version>1.0-SNAPSHOT</version>
  <modules>
    <module>cloud-provider-payment8001</module>
      <module>cloud-consumer-order80</module>
      <module>cloud-api-commons</module>
  </modules>
  <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>5.1.47</mysql.version>
    <druid.version>1.1.16</druid.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
  </properties>

  <!-- 子模块继承之后，提供作用：锁定版本+子modlue不用写groupId和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.SR1</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>
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${
    
    junit.version}</version>
      </dependency>
      <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>${
    
    log4j.version}</version>
      </dependency>
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${
    
    lombok.version}</version>
        <optional>true</optional>
      </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>

引出：dependencyManagement 和 dependencies：Maven使用dependencyManagement元素来提供了一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元素能让所有在子项目中引用个依赖而不用显式的列出版本量。Maven会沿着父子层次向上走，直到找到一个拥有dependencyManagement元素的项目，然后它就会使用这个dependencyManagement元素中指定的版本号。

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

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。

2 cloud-provider-payment8001 构建

创建微服务模块套路

2.1建Module

2.2改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">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.hlg.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

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

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-jdbc -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.hlg.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

    </dependencies>
</project>

2.3写YML

server:
  port: 8001
spring:
  application:
    name: cloud-payment-service
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: com.mysql.jdbc.Driver              # mysql驱动包
    url: jdbc:mysql://localhost:3306/order_db?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: root

mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: com.hlg.springcloud.entities    # 所有Entity别名类所在包

2.4主启动

package com.hlg.springcloud;

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

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

2.5业务类

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=utf8mb4

Entities：

package com.hlg.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
    
    
    private Long id;
    private String serial;
}

JSON封装体CommonResult：

package com.hlg.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T>{
    
    
    private Integer code;
    private String message;
    private T data;

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

DAO：接口PaymentDao：

package com.hlg.springcloud.dao;

import com.hlg.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface PaymentDao {
    
    
    public int create(Payment payment);
    public Payment getPaymentById(@Param("id") Long id);
}

MyBatis映射文件PaymentMapper.xml，路径：resources/mapper/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.hlg.springcloud.dao.PaymentDao">
    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
        insert into payment(serial) values(#{
    
    serial});
    </insert>

    <resultMap id="BaseResultMap" type="com.hlg.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>

Service：

package com.hlg.springcloud.service;

import com.hlg.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;

public interface PaymentService {
    
    
    public int create(Payment payment);
    public Payment getPaymentById(@Param("id") Long id);
}

package com.hlg.springcloud.service.impl;

import com.hlg.springcloud.dao.PaymentDao;
import com.hlg.springcloud.entities.Payment;
import com.hlg.springcloud.service.PaymentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class PaymentServiceImpl implements PaymentService {
    
    
    @Autowired
    private PaymentDao paymentDao;
    @Override
    public int create(Payment payment) {
    
    
        return paymentDao.create(payment);
    }

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

Controller：

package com.hlg.springcloud.controller;

import com.hlg.springcloud.entities.CommonResult;
import com.hlg.springcloud.entities.Payment;
import com.hlg.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@Slf4j
public class PaymentController {
    
    

    @Autowired
    private PaymentService paymentService;

    @PostMapping(value = "/payment/create")
    public CommonResult create(@RequestBody 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<Payment> getPaymentById(@PathVariable("id") Long id) {
    
    
        Payment payment = paymentService.getPaymentById(id);
        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);
        }
    }
}

2.6测试

http://localhost:8001/payment/get/1
http://localhost:8001/payment/create?serial=哈理工002

3 热部署

3.1Adding devtools to your project

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

3.2Adding plugin to your pom.xml 父工程

<build>
    <!--
	<finalName>你的工程名</finalName>（单一工程时添加）
    -->
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <fork>true</fork>
                <addResources>true</addResources>
            </configuration>
        </plugin>
    </plugins>
</build>

3.3Enabling automatic build

3.4reboot

4 cloud-consumer-order80 构建

4.1建Module

4.2改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">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.hlg.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-order80</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.hlg.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

4.3写YML

server:
  port: 80

4.4主启动

package com.hlg.springcloud;

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

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

4.5业务类

实体类：

package com.hlg.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
    
    
    private Long id;
    private String serial;
}

package com.hlg.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T>{
    
    
    private Integer code;
    private String message;
    private T data;

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

控制层：

package com.hlg.springcloud.controller;

import com.hlg.springcloud.entities.CommonResult;
import com.hlg.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@Slf4j
public class OrderController {
    
    
    public static final String PAYMENT_URL = "http://localhost:8001";
    @Autowired
    private RestTemplate restTemplate;
    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment) {
    
    
        /**
         * 使用restTemplate访问restful接口非常的简单粗暴无脑。
         * (url, 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。
         */
        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);
    }
}

配置类：

package com.hlg.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

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

RestTemplate：RestTemplate提供了多种便捷访问远程Http服务的方法，是一种简单便捷的访问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。

使用restTemplate访问restful接口非常的简单粗暴无脑。
(url, 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。

4.6测试

运行cloud-consumer-order80与cloud-provider-payment8001两工程

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

5 工程重构

观察cloud-consumer-order80与cloud-provider-payment8001两工程有重复代码（entities包下的实体）（坏味道），重构。

5.1新建 - cloud-api-commons

5.2POM

<?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.hlg.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-api-commons</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <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>

</project>

5.3entities

package com.hlg.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T>{
    
    
    private Integer code;
    private String message;
    private T data;

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

package com.hlg.springcloud.entities;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
    
    
    private Long id;
    private String serial;
}

5.4.maven clean、install cloud-api-commons工程，以供给cloud-consumer-order80与cloud-provider-payment8001两工程调用。

5.5订单80和支付8001分别改造

将cloud-consumer-order80与cloud-provider-payment8001两工程的公有entities包移除。
引入cloud-api-commons依赖。

 <dependency>
            <groupId>com.hlg.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>