SpringCloud ------尚硅谷2024篇

什么是SpringCloud？

一、微服务架构编码Base工程模块构建

业务需求

微服务cloud整体聚合Maven父工程Project，

Maven父工程步骤

 New Project，聚合总父工程名字，字符编码， 注解生效激活， java编译版本选17，File Type过滤

1.导入pom文件， 

<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.cloud</groupId><artifactId>cloud2024</artifactId><version>1.0-SNAPSHOT</version><packaging>pom</packaging>
// 各组件的版本<properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><hutool.version>5.8.22</hutool.version><lombok.version>1.18.26</lombok.version><druid.version>1.1.20</druid.version><mybatis.springboot.version>3.0.2</mybatis.springboot.version><mysql.version>8.0.11</mysql.version><swagger3.version>2.2.0</swagger3.version><mapper.version>4.2.3</mapper.version><fastjson2.version>2.0.40</fastjson2.version><persistence-api.version>1.0.2</persistence-api.version><spring.boot.test.version>3.1.5</spring.boot.test.version><!-- <spring.boot.version>3.2.0</spring.boot.version><spring.cloud.version>2023.0.0</spring.cloud.version> --><!-- 仅为了整合openfeign + alibaba sentinel的案例，降低版本处理下 --><!-- <spring.boot.version>3.0.9</spring.boot.version><spring.cloud.version>2022.0.2</spring.cloud.version> --><!-- 仅为了整合openfeign + alibaba seata的案例，降低版本处理下 --><spring.boot.version>3.1.7</spring.boot.version><spring.cloud.version>2022.0.4</spring.cloud.version><spring.cloud.alibaba.version>2022.0.0.0-RC2</spring.cloud.alibaba.version><micrometer-tracing.version>1.2.0</micrometer-tracing.version><micrometer-observation.version>1.12.0</micrometer-observation.version><feign-micrometer.version>12.5</feign-micrometer.version><zipkin-reporter-brave.version>2.17.0</zipkin-reporter-brave.version></properties><!--  欢迎报名尚硅谷学习互联网技术，有学习或发展问题zzyybs@126.com    -->
</project>

// dependencies 太长了，就不写了

dependencyManagement和dependencies有什么区别？

pom中父声明，子类谁需要谁取，

dependencyManagement里只是声明依赖，并不实现引用，子项目需要显示声明依赖

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，优势：

*     dependencyManagement里只是声明依赖，并不实现引入，因此子项目需要显式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        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。

maven中跳过单元测试

1.配置

2.工具

Mysql配置

Mysql5

# mysql5.7---JDBC四件套

jdbc.driverClass = com.mysql.jdbc.Driver

jdbc.url= jdbc:mysql://localhost:3306/db2024?useUnicode=true&characterEncoding=UTF-8&useSSL=false

jdbc.user = root

jdbc.password =123456

# Maven的POM文件处理 <dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>5.1.47</version>

</dependency>

Mysql8

# mysql8.0---JDBC四件套

jdbc.driverClass = com.mysql.cj.jdbc.Driver

jdbc.url= jdbc:mysql://localhost:3306/db2024?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8&rewriteBatchedStatements=true&allowPublicKeyRetrieval=true

jdbc.user = root

jdbc.password =123456

# Maven的POM <dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>8.0.11</version>

</dependency>

本次使用Mapper4生成DAO

mybatis-generator： http://mybatis.org/generator/
MyBatis通用Mapper4官网：https://github.com/abel533/Mapper
本次使用Mapper4
下一代:MyBatis 通用 Mapper5官网
https://github.com/mybatis-mapper/mapper

新建一个数据库

引入sql

DROP TABLE IF EXISTS `t_pay`;

CREATE TABLE `t_pay` (

  `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,

  `pay_no` VARCHAR(50) NOT NULL COMMENT '支付流水号',

  `order_no` VARCHAR(50) NOT NULL COMMENT '订单流水号',

  `user_id` INT(10) DEFAULT '1' COMMENT '用户账号ID',

  `amount` DECIMAL(8,2) NOT NULL DEFAULT '9.9' COMMENT '交易金额',

  `deleted` TINYINT(4) UNSIGNED NOT NULL DEFAULT '0' COMMENT '删除标志，默认0不删除，1删除',

  `create_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',

  `update_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',

  PRIMARY KEY (`id`)

) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COMMENT='支付交易表';

INSERT INTO t_pay(pay_no,order_no) VALUES('pay17203699','6544bafb424a');

SELECT * FROM t_pay;

新建模块mybatis_generator2024

在父工程下面创建一个子模块，给子模块导入依赖

说明：这个工程只是为了暂时存储生成的代码，等到业务工程使用的时候，会将对应的类复制过去

父pom中会出现

<modules><module>mbbatis_generator2024</module>
</modules>

说明这是子模块

子pom中 引入的依赖

<dependencies>

        <!--Mybatis 通用mapper tk单独使用，自己独有+自带版本号-->

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis</artifactId>

            <version>3.5.13</version>

        </dependency>

        <!-- Mybatis Generator 自己独有+自带版本号-->

        <dependency>

            <groupId>org.mybatis.generator</groupId>

            <artifactId>mybatis-generator-core</artifactId>

            <version>1.4.2</version>

        </dependency>

        <!--通用Mapper-->

        <dependency>

            <groupId>tk.mybatis</groupId>

            <artifactId>mapper</artifactId>

        </dependency>

        <!--mysql8.0-->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

        </dependency>

        <!--persistence-->

        <dependency>

            <groupId>javax.persistence</groupId>

            <artifactId>persistence-api</artifactId>

        </dependency>

        <!--hutool-->

        <dependency>

            <groupId>cn.hutool</groupId>

            <artifactId>hutool-all</artifactId>

        </dependency>

        <!--lombok-->

        <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>

            <exclusions>

                <exclusion>

                    <groupId>org.junit.vintage</groupId>

                    <artifactId>junit-vintage-engine</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

    </dependencies>

    <build>

        <resources>

            <resource>

                <directory>${basedir}/src/main/java</directory>

                <includes>

                    <include>**/*.xml</include>

                </includes>

            </resource>

            <resource>

                <directory>${basedir}/src/main/resources</directory>

            </resource>

        </resources>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

                <configuration>

                    <excludes>

                        <exclude>

                            <groupId>org.projectlombok</groupId>

                            <artifactId>lombok</artifactId>

                        </exclude>

                    </excludes>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.mybatis.generator</groupId>

                <artifactId>mybatis-generator-maven-plugin</artifactId>

                <version>1.4.2</version>

                <configuration>

                    <configurationFile>${basedir}/src/main/resources/generatorConfig.xml</configurationFile>

                    <overwrite>true</overwrite>

                    <verbose>true</verbose>

                </configuration>

                <dependencies>

                    <dependency>

                        <groupId>mysql</groupId>

                        <artifactId>mysql-connector-java</artifactId>

                        <version>8.0.33</version>

                    </dependency>

                    <dependency>

                        <groupId>tk.mybatis</groupId>

                        <artifactId>mapper</artifactId>

                        <version>4.2.3</version>

                    </dependency>

                </dependencies>

            </plugin>

        </plugins>

    </build>
 

在子模块的resources下新建文件config.properties，将内容改成自己的：

#t_pay表包名
package.name=com.atguigu.cloud# mysql8.0
jdbc.driverClass = com.mysql.cj.jdbc.Driver
jdbc.url= jdbc:mysql://localhost:3306/db2024?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8&rewriteBatchedStatements=true&allowPublicKeyRetrieval=true
jdbc.user = root
jdbc.password =123456

在子模块的resources下新建文件generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfigurationPUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN""http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration><properties resource="config.properties"/><context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat"><property name="beginningDelimiter" value="`"/><property name="endingDelimiter" value="`"/><plugin type="tk.mybatis.mapper.generator.MapperPlugin"><property name="mappers" value="tk.mybatis.mapper.common.Mapper"/><property name="caseSensitive" value="true"/></plugin><jdbcConnection driverClass="${jdbc.driverClass}"connectionURL="${jdbc.url}"userId="${jdbc.user}"password="${jdbc.password}"></jdbcConnection><javaModelGenerator targetPackage="${package.name}.entities" targetProject="src/main/java"/><sqlMapGenerator targetPackage="${package.name}.mapper" targetProject="src/main/java"/><javaClientGenerator targetPackage="${package.name}.mapper" targetProject="src/main/java" type="XMLMAPPER"/><table tableName="t_pay" domainObjectName="Pay"><generatedKey column="id" sqlStatement="JDBC"/></table></context>
</generatorConfiguration>

双击运行maven中的插件，会自动生成代码

自动生成的

Rest通用Base工程构建

步骤：1. 建moudle，2.改POM，3.写YML，4.主启动，5.业务类

1.建moudle cloud-provider-payment8001

父POM中会改变

<modules><module>mbbatis_generator2024</module><module>cloud-provider-payment8001</module>
</modules>

2.改POM

<dependencies><!--SpringBoot通用依赖模块--><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><!--SpringBoot集成druid连接池--><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId></dependency><!-- Swagger3 调用方式 http://你的主机IP地址:5555/swagger-ui/index.html --><dependency><groupId>org.springdoc</groupId><artifactId>springdoc-openapi-starter-webmvc-ui</artifactId></dependency><!--mybatis和springboot整合--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId></dependency><!--Mysql数据库驱动8 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!--persistence--><dependency><groupId>javax.persistence</groupId><artifactId>persistence-api</artifactId></dependency><!--通用Mapper4--><dependency><groupId>tk.mybatis</groupId><artifactId>mapper</artifactId></dependency><!--hutool--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId></dependency><!-- fastjson2 --><dependency><groupId>com.alibaba.fastjson2</groupId><artifactId>fastjson2</artifactId></dependency><!--lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.28</version><scope>provided</scope></dependency><!--test--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
</dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins>
</build>

3.写YML

server:
  port: 8001

# ==========applicationName + druid-mysql8 driver===================
spring:
  application:
    name: cloud-payment-service

  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db2024?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8&rewriteBatchedStatements=true&allowPublicKeyRetrieval=true
    username: root
    password: 123456

# ========================mybatis===================
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.atguigu.cloud.entities
  configuration:
    map-underscore-to-camel-case: true

4.主启动

package com.atguigu.cloud;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
@MapperScan("com.atguigu.cloud.mapper")
public class Main8001 {public static void main(String[] args) {SpringApplication.run(Main8001.class,args);}
}

5.业务类

先把之前生成的entities和mapper的代码复制过来，这是目录结构

新建一个PayDTO，返回Pay中的特定数据，某些重要数据不返回到页面显示。

书写service层代码，

@Service
public class PayServiceImpl implements PayService {@Resourceprivate PayMapper payMapper;@Overridepublic int add(Pay pay) {return payMapper.insertSelective(pay);}@Overridepublic int delete(Integer id) {return payMapper.deleteByPrimaryKey(id);}@Overridepublic int update(Pay pay) {return payMapper.updateByPrimaryKeySelective(pay);}@Overridepublic Pay getById(Integer id) {return payMapper.selectByPrimaryKey(id);}@Overridepublic List<Pay> getAll() {return payMapper.selectAll();}
}