直接上程式碼

pom.xml

        <?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.demo</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>demo</description>

    <parent>
        <groupId
 
>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding
 
>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>

        <!-- spring boot 熱部署外掛 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <!--如果有專案A依賴了demo專案，optional為true時 專案A不顯式引入該外掛，則A不引入該外掛，還有exclusions排除依賴屬性-->
            <optional>true</optional>
        </dependency>

        <!--mysql連線 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!--單元測試 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- alibaba的druid資料庫連線池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version>
        </dependency>

        <!--通用mapper -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.4</version>
        </dependency>

        <!-- 分頁 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>

        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <!--表明該包只在編譯和測試的時候用 -->
            <scope>provided</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8</version>
        </dependency>

        <!--fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.49</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <configuration>
                    <configurationFile>
                        ${basedir}/src/main/resources/generator/generatorConfig.xml
                    </configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.29</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>4.0.0</version>
                    </dependency>
                </dependencies>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

application.yml

server:
  port: 8080
spring:
  datasource:
    name: demo
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      filters: stat
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
      username: root
      password: root
      initial-size: 1
      min-idle: 1
      max-active: 20
      max-wait: 60000
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 300000
      validation-query: SELECT 'x'
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      pool-prepared-statements: false
      max-pool-prepared-statement-per-connection-size: 20
  devtools:
    restart:
      enabled: true
      additional-paths: src/main/java
mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml
  type-aliases-package: com.laolao.demo.model
  configuration:
    map-underscore-to-camel-case: true
mapper:
  mappers: com.laolao.demo.common.mapper.BaseMapper
  identity: mysql
  not-empty: true
pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql
logging:
  level:
    com.laolao.demo.mapper: debug
    com.laolao.demo.common.mapper: debug

BaseMapper

package com.laolao.demo.common.mapper;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

/**
 * @Descrition Mapper基類
 * @Author laolao
 * @Date 2018-09-05 20:54
 * @Version 1.0
 **/
public interface BaseMapper<T> extends Mapper<T>, MySqlMapper<T> {
}

generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>

    <context id="MysqlTkDemo" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>

        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.laolao.demo.common.mapper.BaseMapper"/>
            <!--是否強制生成註解，預設 false，如果設定為 true，不管資料庫名和欄位名是否一致，都會生成註解（包含 @Table 和 @Column）。 -->
            <property name="forceAnnotation" value="true"/>
        </plugin>

        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/demo"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <javaModelGenerator targetPackage="com.laolao.demo.model.systemUserSpread" targetProject="src/main/java"/>

        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>

        <javaClientGenerator targetPackage="com.laolao.demo.mapper.systemUserSpread" targetProject="src/main/java"
                             type="XMLMAPPER"/>

        <table tableName="system__user_spread">
            <!-- 如果設定為true，生成的model類會直接使用column本身的名字，而不會再使用駝峰命名方法，比如BORN_DATE，生成的屬性名字就是BORN_DATE,而不會是bornDate -->
            <property name="useActualColumnNames" value="false"/>
            <!--mysql 配置-->
            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>
            <!--oracle 配置-->
            <!--<generatedKey column="id" sqlStatement="select SEQ_{1}.nextval from dual" identity="false" type="pre"/>-->
        </table>
    </context>
</generatorConfiguration>

IDEA配置generator執行：

選擇Edit Configurations

選擇maven +號

name自己取（我取的是generator）

再Command line 輸入mybatis-generator:generate

點選OK 執行generator

程式碼自動生成了！！！