首先准备个数据库和user表

建表语句如下，当然你也可以用自己的

CREATE TABLE `user` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `name` varchar(255) DEFAULT NULL,  `number` int(11) DEFAULT NULL,  `flag` varchar(255) NOT NULL,  `password` varchar(255) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;//数据INSERT INTO `user` VALUES ('1', '小米', '10001', '1', 'admin');INSERT INTO `user` VALUES ('2', '华为', '10002', '1', 'admin');INSERT INTO `user` VALUES ('3', '黑莓', '10003', '0', 'admin');INSERT INTO `user` VALUES ('4', '三星', '10004', '0', 'admin');

接着创建一个springboot工程

输入工程的基本信息

这里我们先只加web依赖，springboot版本为2.2.6

向pom.xml文件添加相关依赖

<dependency>      <groupId>mysqlgroupId>      <artifactId>mybatis-spring-boot-starterartifactId>      <version>5.1.39version>dependency><dependency>      <groupId>org.mybatis.spring.bootgroupId>      <artifactId>mybatis-spring-boot-starterartifactId>      <version>2.1.1version>dependency>

在build标签下的plugins中添加一下内容

<plugin>                   <groupId>org.mybatis.generatorgroupId>                   <artifactId>mybatis-generator-maven-pluginartifactId>                   <version>1.3.2version>                   <configuration>                                                    <configurationFile>src/main/resources/mybatis-generator.xmlconfigurationFile>                           <verbose>trueverbose>                           <overwrite>trueoverwrite>                      configuration>                       <executions>                          <execution>                             <id>Generate MyBatis Artifactsid>                          <goals>                                <goal>generategoal>                           goals>                       execution>                  executions>               <dependencies>                      <dependency>                         <groupId>org.mybatis.generatorgroupId>                         <artifactId>mybatis-generator-coreartifactId>                         <version>1.3.2version>                      dependency>                  dependencies>             plugin>

在resources下创建mybatis-generator.xml文件

<?xml  version="1.0" encoding="UTF-8"?>generatorConfiguration        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration>        <classPathEntry location="C:\Users\20140\.m2\repository\mysql\mysql-connector-java\5.1.39\mysql-connector-java-5.1.39.jar"/>        <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">        <property name="autoDelimitKeywords" value="true" />        <property name="beginningDelimiter" value="`" />        <property name="endingDelimiter" value="`" />        <property name="javaFileEncoding" value="utf-8" />        <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />        <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />                <commentGenerator >            <property name="suppressAllComments" value="true"/>            <property name="suppressDate" value="true" />         commentGenerator>                <jdbcConnection driverClass="com.mysql.jdbc.Driver"                        connectionURL="jdbc:mysql://localhost:3306/test"                        userId="root"                        password="123456">        jdbcConnection>                <javaTypeResolver>                        <property name="forceBigDecimals" value="false"/>        javaTypeResolver>                <javaModelGenerator targetPackage="com.example.mybatis.entity" targetProject="src/main/java">            <property name="enableSubPackages" value="true"/>            <property name="trimStrings" value="true"/>        javaModelGenerator>                <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources" >            <property name="enableSubPackages" value="false" />        sqlMapGenerator>                <javaClientGenerator targetPackage="com.example.mybatis.dao" targetProject="src/main/java" type="XMLMAPPER" >            <property name="enableSubPackages" value="false" />        javaClientGenerator>                                                <table tableName="user" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true">            <generatedKey column="id" sqlStatement="Mysql" identity="true" />        table>    context>generatorConfiguration>

在工程根目录下分别创建文件dao，entity，在resources下创建mapper文件夹，最后的工程结构如下(static和templates是用于页面静态文件和页面模板的存放，这里我们没有用到)：

至此generator就配置好了，只执行generator就可以生成对应的代码文件，双击mybatis-generator即可

控制台输出以下内容就算是成功了

自动生成代码后工程目录如下：

接下来就将service和controller补充完测试下能否调用到数据

在根目录下创建controller和service文件夹，敲出测试接口及service接口

//controller接口：@RestController@RequestMapping("/test")public class TestController {    @Autowired    private UserService userService;    @RequestMapping("/getAll")    public List getUser(){        return userService.getAllUser();    }}//service接口public interface UserService {    List getAllUser();}//service实现@Servicepublic class UserServiceImpl implements UserService {    @Autowired    private UserMapper userMapper;        @Override    public List getAllUser() {        return userMapper.selectAll();    }}

敲代码过程中注意方法上的注解：

将该注解下的类注册到Spring容器，不需要再在applicationContext.xml文件定义bean了

还有就是配置application.properties

#设置服务端口server.port=8888#数据库配置spring.datasource.url=jdbc:mysql://localhost:3306/testspring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.username=rootspring.datasource.password=950724#指定mapper.xml文件路径mybatis.mapper-locations=classpath:mapper/*.xml

最后千万别忘了在启动类上加上MapperScan注解表明dao下的文件

最终目录是这样的：

接下来就是启动项目见证奇迹的时候了，能看数据就说明成功了！！！