springboot+idea+maven 多模块项目搭建的详细过程（连接数据库进行测试）

创建之前项目之前 记得改一下 maven  提高下载Pom速度 

 记得 setting 中要改 maven  改成 阿里云的。具体方法 网上查第一步 搭建parents 项目，为maven项目 ，不为springboot 项目 记得修改groupId 

第二步 搭建多个子模块， honor-dao   honor-manager   honor-common记得创建 honor-manager 的时候 要把他的gruopId 改成com.honor.manager

这里爆红的原因是 因为 我做到后面然后忘记截屏了，返回来做。实际我已经创建了 ，所以这个步骤是对的。按照这个做法，创建 honor-dao   honor-manager   honor-common，记得创建 honor-manager 的时候 要把他的gruopId 改成com.honor.manager

第三步  在 honor-manager 下分别创建 honor-manager-fc（maven）  honor-manager-user（maven） honor-manager-boot (springboot,记得要使用springboot创建)创建时候 有两个坑 第一个是 父级  别选错 。他一般会默认 选第一级别，就是 honor  但是我们要继承的是 honor-manager第二个是路径 别写错

第四步 开始对各大 Pom 进行整合  dao  中一般需要引入 common  ，common 一般不需要引 其他模块，然后呢 manager 中要同时引入dao  和 common第一个是  honor  父级的 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.honor</groupId>
<artifactId>phone</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>honor-dao</module>
<module>honor-common</module>
<module>honor-manager</module>
</modules>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<honor-common>1.0-SNAPSHOT</honor-common>
<honor-dao>1.0-SNAPSHOT</honor-dao>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<skipTests>true</skipTests>
<hutool.version>4.5.7</hutool.version>
<swagger2.version>2.7.0</swagger2.version>
<mybatis-generator.version>1.3.7</mybatis-generator.version>
<mybatis.version>3.4.6</mybatis.version>
<postgresql.version>42.2.12</postgresql.version>
<spring-data-commons.version>2.1.5.RELEASE</spring-data-commons.version>
<jjwt.version>0.9.0</jjwt.version>
<aliyun-oss.version>2.5.0</aliyun-oss.version>
<gson.version>2.8.5</gson.version>
<log4j2.version>2.13.3</log4j2.version>
<mybatis-plus.version>3.1.0</mybatis-plus.version>
<activiti.version>6.0.0</activiti.version>
<poi.version>4.1.2</poi.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions><!-- 去掉默认配置 -->
<!--<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>-->
<exclusion>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
</exclusion>
<exclusion>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>-->
<!-- 移除Tomcat之后会报错，加入下面的依赖，使用外部容器 -->
<!--<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${log4j2.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j2.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jul</artifactId>
<version>${log4j2.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j2.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.5.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.honor</groupId>
<artifactId>honor-common</artifactId>
<version>${honor-common}</version>
</dependency>
<dependency>
<groupId>com.honor</groupId>
<artifactId>honor-dao</artifactId>
<version>${honor-dao}</version>
</dependency>
<!--阿里巴巴连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.20</version>
</dependency>
<!--Swagger-UI API文档生产工具-->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${swagger2.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${swagger2.version}</version>
</dependency>
<!-- MyBatis-->
<!--<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>-->
<!-- mybatis plus -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mybatis-plus.version}</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>${mybatis-plus.version}</version>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
<version>8.0.13</version>
</dependency>
<!--SpringData工具包-->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons</artifactId>
<version>${spring-data-commons.version}</version>
</dependency>
<!--JWT(Json Web Token)登录支持-->
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>${jjwt.version}</version>
</dependency>
<!--Google的JSON解析工具-->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>${gson.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/net.sf.json-lib/json-lib -->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<!-- https://mvnrepository.com/artifact/org.activiti/activiti-engine -->
<dependency>
<groupId>org.activiti</groupId>
<artifactId>activiti-engine</artifactId>
<version>${activiti.version}</version>
<exclusions>
<exclusion>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--没有会引起mybaits plus通用mapper和activity的冲突-->
<dependency>
<groupId>org.activiti</groupId>
<artifactId>activiti-spring-boot-starter-jpa</artifactId>
<version>${activiti.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>

第二个是honor-common

<?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>phone</artifactId>
<groupId>com.honor</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>honor-common</artifactId>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-annotation</artifactId>
<version>3.1.0</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

 第三个是honor-dao的 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>phone</artifactId>
<groupId>com.honor</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>honor-dao</artifactId>

<dependencies>
<dependency>
<groupId>com.honor</groupId>
<artifactId>honor-common</artifactId>
</dependency>

<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependencies>
</project>

第四个是honor-manager的 

<?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>phone</artifactId>
<groupId>com.honor</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<groupId>com.honor.manager</groupId>
<artifactId>honor-manager</artifactId>
<packaging>pom</packaging>
<modules>
<module>honor-manager-txn1</module>
<module>honor-manager-user1</module>
<module>honor-manager-boot</module>
</modules>
<dependencies>
<dependency>
<groupId>com.honor</groupId>
<artifactId>honor-common</artifactId>
</dependency>
<dependency>
<groupId>com.honor</groupId>
<artifactId>honor-dao</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.honor.manager</groupId>
<artifactId>honor-manager-boot</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.honor.manager</groupId>
<artifactId>>honor-manager-txn1</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.honor.manager</groupId>
<artifactId>>honor-manager-user1</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>

然后 是 honor-manager-user

<?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>honor-manager</artifactId>
<groupId>com.honor.manager</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>honor-manager-user1</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>

然后 是honor-manager-boot记得boot 要引入 txn1 和 user的依赖，记得要把parents 要改一下，是为honor-manager. 

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>honor-manager</artifactId>
<groupId>com.honor.manager</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.honor.manager</groupId>
<artifactId>honor-manager-boot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>honor-manager-boot</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>com.honor.manager</groupId>
<artifactId>honor-manager-user1</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.honor.manager</groupId>
<artifactId>honor-manager-txn1</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>RELEASE</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

  第二阶段  开始测试 首先搭建数据库，做个简单的User 表测试就行了 

然后搭建 beans 

User 的内容

package com.honor.common.beans;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
public class User {
@TableId(type = IdType.AUTO)
private Integer id;
private String username;
private String password;
}

第二部 dao层

UserMapper接口

package com.honor.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.honor.common.beans.User;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}

UserMapper.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.honor.mapper.UserMapper">
<resultMap id="User" type="com.eft.common.beans.User"/>
</mapper>

第三部分 springboot 的application 中加入扫描包的注解

@ServletComponentScan

@MapperScan("com.honor.mapper")

  然后编写application.yml 文件 

server:
port: 8880
servlet:
context-path: /honor-manager

spring:
application:
name: users
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/eft?characterEncoding=UTF-8&serverTimezone=UTC&useSSL=true
username: root
password: 111111
mybatis-plus:
mapper-locations:
- classpath*:com/honor/mapper/*.xml
check-config-location: true
debug: true

紧接着编写 userController 进行测试一定要前缀一样！这里注意要前缀一样，要不 扫描不到    

UserController代码

package com.honor.manager.controller;
import com.honor.common.beans.User;
import com.honor.mapper.UserMapper;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.Map;
@RestController
public class UserController {
@Resource
UserMapper userMapper;
@RequestMapping(
value = "/api/user",
method = RequestMethod.GET,
produces = MediaType.APPLICATION_JSON_UTF8_VALUE
)
@ResponseBody
public User read(@RequestParam Map<String, Object> params) {
return userMapper.selectById("1");
}
@GetMapping("/api/test")
public String hello() {
return "hello";
}
}

访问 http://localhost:8880/honor-manager/api/user

 自

此 多级模块的项目就搭建成功了！

来源：https://blog.csdn.net/weixin_40708261/article/details/107936406