1.配置：

1.1 resource (application.properties)

//标红的记得改

## 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/20181020db?useUnicode=true&characterEncoding=utf8
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
## Mybatis 配置
mybatis.typeAliasesPackage=com.czxy.domain
mybatis.mapperLocations=classpath:com/czxy/dao/*.xml
## Mapper 配置
mapper.plugin=tk.mybatis.mapper.generator.MapperPlugin
mapper.Mapper=tk.mybatis.mapper.common.Mapper
mapper.mappers=com.czxy.utils.MapperUtils
mapper.not-empty=false
mapper.identity=MYSQL
## PageHelper
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

spring.activemq.broker-url=tcp://localhost:61616
spring.activemq.in-memory=false
spring.activemq.pool.enabled=false
spring.activemq.user=admin
spring.activemq.password=admin

1.2 resource (config.properties)

# 数据库配置
mysql.driver=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://localhost:3306/20181020db?useUnicode=true&characterEncoding=UTF-8
mysql.username=
mysql.password=
# 通用Mapper配置
mapper.plugin=tk.mybatis.mapper.generator.MapperPlugin
mapper.Mapper=com.czxy.utils.MapperUtils
#  Java接口和实体类
targetJavaProject=src/main/java
targetModelPackage=com.czxy.domain
#  Mapper 生成路径
targetMapperProject=src/main/java
targetMapperPackage=com.czxy.dao
# Mapper XML 生成路径
targetResourcesProject=src/main/resources
targetXMLPackage=com.czxy.dao
# 指定要生成的表名 %为所有表 单表，请指定表名
targetTableName=t_cen

1.3 resource (generatorConfig.xml)

不用修改：

<?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>
    <properties resource="config.properties"/>

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

        <plugin type="${mapper.plugin}">
            <property name="mappers" value="${mapper.Mapper}"/>
        </plugin>

        <jdbcConnection driverClass="${mysql.driver}"
                        connectionURL="${mysql.url}"
                        userId="${mysql.username}"
                        password="${mysql.password}">
        </jdbcConnection>

        <javaModelGenerator targetPackage="${targetModelPackage}" targetProject="${targetJavaProject}"/>

        <sqlMapGenerator targetPackage="${targetXMLPackage}"  targetProject="${targetResourcesProject}"/>

        <javaClientGenerator targetPackage="${targetMapperPackage}" targetProject="${targetMapperProject}" type="XMLMAPPER" />

        <table tableName="${targetTableName}" >
            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>
        </table>
    </context>
</generatorConfiguration>

2.1 pom.xml (本项目所依赖的jar包，我就直接全粘贴过来了)

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.39</version>
        </dependency>
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.3</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>
        <!-- 模板引擎 Thymeleaf 依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
            <version>2.0.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-activemq</artifactId>
            <version>2.0.4.RELEASE</version>
        </dependency>



    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!-- 通用mapper -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</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>5.1.39</version>
                    </dependency>
                    <dependency>
                        <groupId>tk.mybatis</groupId>
                        <artifactId>mapper</artifactId>
                        <version>4.0.3</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

3.MapperUtils.java(工具类)

package com.czxy.utils;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
/**
*@author Fang
*@create 2018/10/20 17:52
*@desc  自动生成   mapper 与 domain utils  类
**/
public interface MapperUtils<T> extends Mapper<T>,MySqlMapper<T> {
}

4 点击生成！