1、在pom.xml裡新增maven外掛

<plugin>  
                <groupId>org.mybatis.generator</groupId>  
                <artifactId>mybatis-generator-maven-plugin</artifactId>  
                <version>1.3.5</version>  
                <dependencies>  
                    <dependency>  
                        <groupId> mysql</groupId>  
                        <artifactId> mysql-connector-java</artifactId>  
                        <version> 5.1.39</version>  
                    </dependency>  
                    <dependency>  
                        <groupId>org.mybatis.generator</groupId>  
                        <artifactId>mybatis-generator-core</artifactId>  
                        <version>1.3.5</version>  
                    </dependency>  
                </dependencies>  
                <executions>  
                    <execution>  
                        <id>Generate MyBatis Artifacts</id>  
                        <phase>package</phase>  
                        <goals>  
                            <goal>generate</goal>  
                        </goals>  
                    </execution>  
                </executions>  
                <configuration>  
                    <!--允許移動生成的檔案 -->  
                    <verbose>true</verbose>  
                    <!-- 是否覆蓋 -->  
                    <overwrite>true</overwrite>  
                    <!-- 自動生成的配置 -->  
                    <configurationFile>  
                        src/main/resources/mybatis-generator.xml</configurationFile>  
                </configuration>  
            </plugin>  
 

2.在resources下建立mybatis-generator.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="DB2Tables"    targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--資料庫連結地址賬號密碼-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:8080/book" userId="root" password="123">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!--生成Model類存放位置-->
        <javaModelGenerator targetPackage="com.yunling.springboot2.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--生成對映檔案存放位置-->
        <sqlMapGenerator targetPackage="com.yunling.springboot2.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!--生成Dao類存放位置-->
        <!-- 客戶端程式碼，生成易於使用的針對Model物件和XML配置檔案 的程式碼
                type="ANNOTATEDMAPPER",生成Java Model 和基於註解的Mapper物件
                type="MIXEDMAPPER",生成基於註解的Java Model 和相應的Mapper物件
                type="XMLMAPPER",生成SQLMap XML檔案和獨立的Mapper介面
        -->
        <javaClientGenerator type="ANNOTATEDMAPPER" targetPackage="com.yunling.springboot2.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--生成對應表及類名-->
        <table tableName="tb_book" domainObjectName="Book" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>
 

3、在src/main/java/com/yunling/springboot2下建立dao、model、mapper資料夾。

4、在maven project下雙擊mybatis-generator外掛下的mybatis-generator:generate

步驟1：

步驟2：

步驟3：

4.檔案就可以生成了