springboot项目下使用mybatis generator生成pojo类、mapper文件以及dao类

步骤：

1.在pom.xml文件中添加一个generator的maven工具：

<build>
      <plugins>
           <plugin>
               <groupId>org.mybatis.generator</groupId>
               <artifactId>mybatis-generator-maven-plugin</artifactId>
               <version>1.3.2</version>
               <executions>
                   <execution>
                       <id>Generate MyBatis Artifacts</id>
                       <goals>
                           <goal>generate</goal>
                       </goals>
                   </execution>
               </executions>
               <configuration>
                   <!-- generator 工具配置文件的位置 -->
                   <configurationFile>src/main/resources/mybatis-generator/generatorConfig.xml</configurationFile>
                   <verbose>true</verbose>
                   <overwrite>true</overwrite>
               </configuration>
               <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.34</version>
                    </dependency>
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.2</version>
                    </dependency>
               </dependencies>
           </plugin>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
               <configuration>
                   <classifier>exec</classifier>
               </configuration>
           </plugin>
       </plugins>
   </build>

2.上面指定了mybatis generator工具配置文件的位置，在这个位置创建一个xml文件（即src/main/resources/mybatis-generator目录下创建generatorConfig.xml文件），并做如下配置：

<?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">
<!--根节点 -->
<generatorConfiguration>
    <!-- 必须 指定生成一组对象的环境 -->
    <context id="default" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <!--分隔符 -->
        <property name="autoDelimitKeywords" value="true"/>
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <!-- 生成的pojo，将implements Serializable-->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
        <!-- 注释 规则-->
        <commentGenerator>
            <property name="suppressAllComments" value="false"/>
            <property name="suppressDate" value="true"/>
        </commentGenerator>

        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/ssh"
                        userId="root"
                        password="root">
        </jdbcConnection>
        <javaModelGenerator targetPackage="com.xhwl.demo.model" targetProject="src/main/java"/>
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <javaClientGenerator targetPackage="com.xhwl.demo.dao" targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <table tableName="table" domainObjectName="table"
               enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true">
            <!-- 配置生成的实体与数据库字段名一样 -->
            <property name="useActualColumnNames" value="true"></property>
            <!-- 数据库表主键 -->
            <generatedKey column="id" sqlStatement="Mysql" identity="true" />
        </table>       

    </context>
</generatorConfiguration>

3.数据库表建立好后在pom.xml文件所在的目录执行如下命令：

mvnmybatis-generator:generate

或者在intellij idea下点击运行，如图所示