一、约定 > 配置 > 编码
二、IDEA新建project工作空间
1 新建Empty Project，类似工作空间
2 新project设置 2.1 project都选择8 2.2 module点击+号，新建一个maven模块
3 新Module的设置 3.1 由于第一个是pom统一工程，不选择模板create from archetype
3.2 G:com.atguigu.Springcloud
A:microservicecloud
V:1.0-SNAPSHOT
3.3 Language Level 选择 8
4 新project设置 4.1 Editor | File Encodings 设置为UTF8 4.2 Build, Execution, Deployment | Compiler | Annotation Processors 每个module都打勾 4.3 File | Settings | Build, Execution, Deployment | Compiler | Java Compiler 设置为1.8
5 microservicecloud该模块下鼠标右键新建其下的子module 5.1 新建子module microservicecloud-api 可以不勾选create from archetype 5.2 IDEA工具右边的maven projects视图刷新，出现新的子模块 5.3 右上角设置，选择Group Modules 5.4 视图上选择+号，选中api里面的pom.xml
6 IDEA工具隐藏*.iml等 点击File–>setting(或者Ctrl+Alt+S)–>Editor–> Flie Types 在ignore files and folders，然后在输入框最后面跟上*.idea;*.iml;
1、微服务cloud整体聚合父工程Project
父工程步骤 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
2、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>org.example</groupId>
<artifactId>cloud2020</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- 刚创建父工程的时候没有modules，当创建子模块的时候就会出现modules
说明cloud-provider-payment8001是cloud2020的子模块-->
<modules>
<module>cloud-provider-payment8001</module>
</modules>
<!--说明是父工程-->
<packaging>pom</packaging>
<!-- packaging pom 总工程-->
<!--统一管理jar包版本-->
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>12</maven.compiler.source>
<maven.compiler.target>12</maven.compiler.target>
<junit.version>4.12</junit.version>
<lombok.version>1.18.10</lombok.version>
<log4j.version>1.2.17</log4j.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module不用写groupId和version-->
<dependencyManagement><!--定义规范，但不导入-->
<dependencies>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</dependency>
<!--spring boot 2.2.2-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.2.4.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 阿里巴巴-->
<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>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
<scope>runtime</scope>
</dependency>
<!-- druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.spring.boot.version}</version>
</dependency>
<!--junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<!--log4j-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<!--热启动插件-->
<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、Maven工程落地细节复习
1、Maven中的DependencyManagement和Dependencies dependencyManagement
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。 -
如果不在子项目中声明依赖，是不会从父项目中继承下来的；只有在子项目中写了该依赖项，并且没有指定具体版本， 才会从父项目中继承该项，并且version和scope都读取自父pom;
-
如果子项目中指定了版本号，那么会使用子项目中指定的jar版本。
2、maven中跳过单元测试
1 配置<build><!-- maven中跳过单元测试 -->
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
2 IDEA工具支持(推荐)
4、父工程创建完成执行mvn:install将父工程发布到仓库方便子工程继承
5、mysql驱动说明
com.mysql.jdbc.Driver和mysql-connector-java 5一起用。
com.mysql.cj.jdbc.Driver和mysql-connector-java 6 一起用。
com.mysql.cj.jdbc.Driver是mysql-connector-java 6 中的特性，相比mysql-connector-java 5 多了一个时区：serverTimezone，把数据源配置的驱动改一下就好了
org.gjt.mm.mysql.Driver是当时最好的MySQL JDBC，但不是MySQL公司的，然后MySQL将MM的JDBC驱动 收为官方的JDBC驱动，所以将驱动的package也改了，但还保留了org.gjt.mm.mysql.Driver这个路径的引用，也就是你使用新版的JDBC驱动时还可以通过这个来引用，打开下载的新版JDBC驱动的jar文件可以看到，只有一个文件的目录是org.gjt.mm.mysql，就是为了兼容而设计的。
三、Rest微服务工程构建
1、构建步骤
1、cloud-provider-payment8001 微服务提供者支付Module模块
1.1、建cloud-provider-payment8001
创建完成后请回到父工程查看pom文件变化
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>org.example</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>
<!--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>
<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>
3、写YML
application.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: org.gjt.mm.mysql.Driver # mysql驱动包
url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 密码
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.atguigu.springcloud.entities # 所有Entity别名类所在包
4、主启动
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @author String-int
* @create 2022-04-25 0:49
*/
@SpringBootApplication
public class PaymentMain8001 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8001.class, args);
}
}
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
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
/**
* @author String-int
* @create 2022-04-25 0:51
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
private Long id;
private String serial;
}
Json封装体CommonResult
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author String-int
* @create 2022-04-25 0:53
*/
@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);
}
}
3、dao
接口PaymentDao
package com.atguigu.springcloud.dao;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
/**
* @author String-int
* @create 2022-04-25 0:54
*/
@Mapper//import org.apache.ibatis.annotations.Mapper;
public interface PaymentDao {
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}
mybaits的映射文件PaymentMapper.xml 路径 src\main\resources\mapper\PaymentMapper.xml 文件头
<?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">
</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.atguigu.springcloud.dao.PaymentDao">
<insert id="create" parameterType="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
package com.atguigu.springcloud.service;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;
/**
* @author String-int
* @create 2022-04-25 0:59
*/
public interface PaymentService {
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}
实现类
package com.atguigu.springcloud.service.xml;
/**
* @author String-int
* @create 2022-04-25 1:00
*/
import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class PaymentServiceImpl implements PaymentService {
@Resource
private PaymentDao paymentDao;
@Override
public int create(Payment payment) {
return paymentDao.create(payment);
}
@Override
public Payment getPaymentById(Long id) {
return paymentDao.getPaymentById(id);
}
}
5、controller
package com.atguigu.springcloud.controller;
/**
* @author String-int
* @create 2022-04-25 1:02
*/
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
@RestController
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
// http://localhost:8001/payment/create?serial=为什么加@RequestBody不行
@PostMapping(value = "/payment/create")
public CommonResult create(@RequestBody Payment payment) {
int result = paymentService.create(payment);
log.info("*****插入操作返回结果:" + 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);
}
}
// http://localhost:8001/payment/get/1
@GetMapping(value = "/payment/get/{id}")
public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {
Payment payment = paymentService.getPaymentById(id);
log.info("*****查询结果:{}", 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);
}
}
}
6、测试 http://localhost:8001/payment/get/31 postman模拟post 运行 1、通过修改idea的workspace.xml的方式来快速打开Run Dashboard窗口 2、开启Run DashBoard
你自己路径：D:\devSoft\JetBrains\IdeaProjects\自己project名\.idea
<option name="configurationTypes"> <set> <option value="SpringBootApplicationConfigurationType" /> </set> </option>
3、部分同学可能由于idea版本不同，需要关闭重启 7、小总结 建module 改POM 写YML 主启动 业务类
2、热部署Devtools
1、Adding devtools to your project
<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
下段配置我们粘贴进聚合父类总工程的pom.xml里
<build>
<finalName>你自己的工程名字</finalName>
<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
5、重启IDEA
3、cloud-consumer-order80 微服务消费者订单Module模块
1、建cloud-consumer-order80 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>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumer-order80</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.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>
3、写YML
server:
port: 80
4、主启动
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @author String-int
* @create 2022-04-25 3:20
*/
@SpringBootApplication
public class MainApp80 {
public static void main(String[] args) {
SpringApplication.run(MainApp80.class, args);
}
}
5、业务类
1、entities
主实体Payment
package com.atguigu.springcloud.entities;
/**
* @author String-int
* @create 2022-04-25 3:23
*/
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.atguigu.springcloud.entities;
/**
* @author String-int
* @create 2022-04-25 3:33
*/
public class CommonResult<T> {
private Integer code;
private String message;
private T data;
public CommonResult() {
}
public CommonResult(Integer code, String message, T data) {
this.code = code;
this.message = message;
this.data = data;
}
public CommonResult(Integer code, String message) {
this(code, message, null);
}
public CommonResult(T data) {
this(200, "操作成功", data);
}
//setter--getter
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
}
2、首说RestTemplate
是什么 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
官网及使用
使用 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。
3、config配置类
ApplicationContextConfig
package com.atguigu.springcloud.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
/**
* @author String-int
* @create 2022-04-25 3:30
*/
@Configuration
public class ApplicationContextConfig {
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
4、controller
package com.atguigu.springcloud.controller;
/**
* @author String-int
* @create 2022-04-25 3:25
*/
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.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 PaymentSrv_URL = "http://localhost:8001";
@Autowired
private RestTemplate restTemplate;
@GetMapping("/consumer/payment/create")//客户端用浏览器是get请求，但是底层实质发送post调用服务端8001
public CommonResult create(Payment payment) {
return restTemplate.postForObject(PaymentSrv_URL + "/payment/create", payment, CommonResult.class);
}
//http://localhost/consumer/payment/get/1
@GetMapping("/consumer/payment/get/{id}")
public CommonResult getPayment(@PathVariable Long id) {
return restTemplate.getForObject(PaymentSrv_URL + "/payment/get/" + id, CommonResult.class, id);
}
}
6、测试 http://localhost/consumer/payment/get/1 不要忘记@RequestBody注解 http://localhost/consumer/payment/create?serial=aaaaa1
4、工程重构
1、观察问题
系统中有重复部分，重构， 
2、新建 cloud-api-commons 3、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>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-api-commons</artifactId>
<dependencies>
<!--devtools热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--hutool工具包-->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.1.0</version>
</dependency>
</dependencies>
</project>
4、entities 将cloud-consumer-order80的entities复制过来 5、maven命令clean install
6、订单80和支付8001分别改造 删除掉订单80和支付8001的entities 在订单80和支付8001的pom加入
<!--引入自己定义的api通用包，可以使用Payment支付Entity -->
<dependency>
<groupId>org.example</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
2、目前工程样图
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