Rest学习环境搭建：服务提供者

1.新建一个maven项目作为父项目，删掉src，导入相关依赖，再建子项目，

 <!--    打包方式 pom-->
    <packaging>pom</packaging>
    <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>
        <lombok-version>1.18.24</lombok-version>
    </properties>

    <dependencyManagement>
        <dependencies>
<!--            springcloud依赖-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>2021.0.3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.6.8</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
<!--            mysql-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.28</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.2.11</version>
            </dependency>
<!--            springboot启动器-->
            <dependency>
                <groupId>com.github.dreamroute</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>2.0.0</version>
            </dependency>
<!--            日志测试-->
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.3.0-alpha16</version>
            </dependency>
<!--            junit-->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit-version}</version>
            </dependency>
<!--            lombok-->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lomb</artifactId>
                <version>${lombok-version}</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

2，连接数据库，建库建表，写实体类pojo

package com.company.springcloud.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

import java.io.Serializable;



@Data
@NoArgsConstructor
@Accessors(chain = true) //链式写法
public class Dept implements Serializable {//dept orm对象关系映射 类表关系映射
    //Long类型 mysql用了bigint
    private Long deptno;
    private String dname;

    //这个数据存在哪个数据库的字段，微服务，一个服务对应一个数据库，同一个信息可能存在不同数据库
    private String db_source;
    public Dept(String dname){
        this.dname=dname;
    }
    /*
    链式写法：
        Dept dept = new Dept();
        dept.setDeptNo(11).setDname("ss").setDB_Source();
     */
}

服务提供者：

1、新建一个模块服务提供者，引入相关依赖，写dao层，serviec层，controller层，再写启动类，

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

    <artifactId>springcloud-provider-dept-8001</artifactId>

    <dependencies>
<!--        我们需要拿到实体类，所以要配置api-module,爆红的可以去父类pom重新install-->
        <dependency>
            <groupId>com.company</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
<!--        jetty-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
<!--        热部署工具-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

    </dependencies>

</project>

mybatis配置：

 

 

yml配置：

 

 dao层 mapper

 

 Service层：和serviceImpl

 

 controller层：

 

 启动类：