1.安裝外掛（eclipse的marketplace中搜索mybatis就行了）

2.建立generatorConfig.xml檔案（配置資料庫等資訊，讀懂這個檔案的內容就行了）

generatorConfig.xml檔案

<?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>
    <classPathEntry location="E:/jar/mysql-connector-java-5.1.25.jar" />
    <context id="context1">
        <!-- 生成的pojo，將implements Serializable -->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
        <commentGenerator
 
>
            <!-- 是否去除自動生成的註釋 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
            connectionURL="jdbc:mysql://127.0.0.1:3306/hongbaodb?characterEncoding=utf8"
 

            userId="kevinLee" password="1234" />
        <javaModelGenerator targetPackage="com.ithaha.pojo"
            targetProject="redpacket" />
        <sqlMapGenerator targetPackage="com.ithaha.mapper"
            targetProject="redpacket" />
        <javaClientGenerator targetPackage="com.ithaha.mapper"
            targetProject="redpacket" type="XMLMAPPER" />
        <table schema="RedPacket" tableName="t_red_packet"
            enableCountByExample="false" enableUpdateByExample="false"
            enableDeleteByExample="false" enableSelectByExample="false"
            selectByExampleQueryId="false" domainObjectName="RedPacket"></table>
        <table schema="UserRedPacket" tableName="t_user_red_packet"
            enableCountByExample="false" enableUpdateByExample="false"
            enableDeleteByExample="false" enableSelectByExample="false"
            selectByExampleQueryId="false" domainObjectName="UserRedPacket"></table>
    </context>
</generatorConfiguration>

3.生成對應實體類和mapper檔案