利用mybatis-generator可以自动生成代码
mybatis-generator的安装方法有很多种：

MyBatis Generator (MBG) can be run in the following ways:

From the command prompt with an XML configuration
As an Ant task with an XML configuration
As a Maven Plugin
From another Java program with an XML configuration
From another Java program with a Java based configuration
As an Eclipse Feature

官方文档：http://www.mybatis.org/generator/running/running.html

本文介绍eclipse插件、maven插件的安装办法。
官方文档：
http://www.mybatis.org/generator/running/runningWithEclipse.html
http://www.mybatis.org/generator/running/runningWithMaven.html
一、eclipse插件方式
eclipse插件：
(1)eclipse help -->eclipse marketplace -->输入：mybatis-generator搜索插件

(2) generatorConfig.xml配置文件
在src/main/resources下创建generatorConfig.xml文件，内容如下：

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<?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="D:\\app\java\apache-maven-3.3.9\repo\mysql\mysql-connector-java\5.1.30\mysql-connector-java-5.1.30.jar"/>
<context id="context1">
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://10.50.8.19:3306/test" userId="root"
password="biostime123"/>
<javaModelGenerator targetPackage="com.jiang.mavenSSM.entity"
targetProject="mavenSSM">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<sqlMapGenerator targetPackage="com.jiang.mavenSSM.entity.xml"
targetProject="mavenSSM">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<javaClientGenerator targetPackage="com.jiang.mavenSSM.mapper"
targetProject="mavenSSM" type="XMLMAPPER">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<table tableName="user_t" domainObjectName="FeeBase"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false">
<!--<columnRenamingRule searchString="^D_"
replaceString=""/>-->
</table>
</context>
</generatorConfiguration>

注意：mybatis-generator以eclipse插件方式安装时，generatorConfig.xml配置文件里的targetProject="mavenSSM"为项目名称
其中generatorConfig.xml的位置，大家根据实际情况自行调整

（3）自动生成文件
如果是在eclipse 中，选择generatorConfig.xml文件，击右键先择"Generator MyBatis/iBATIS Artifacts"

二、maven插件方式
（maven插件安装请参考我的另一篇文章）
（1）下载mybatis-generator
下载地址：https://github.com/mybatis/generator/releases/tag/mybatis-generator-1.3.4

下载后解压并把lib目录下的Jar包，复制到MAVEN安装路径的lib目录下，我的MAVEN安装目录为 D:\app\java\apache-maven-3.3.9\lib

（2）在pom.xml中添加plugin

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<build>
……
<plugins>
……
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.4</version>
<configuration>
<configurationFile>src/main/resources/mybatis-generator/generatorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
<executions>
<execution>
<id>Generate MyBatis Artifacts</id>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.4</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>

（3）创建generatorConfig.xml文件
generatorConfig.xml文件内容，除了targetProject标签的值不同外，其它与eclipse插件方式的generatorConfig.xml一样，

targetProject改为绝对路径：
targetProject="D:\app\java\eclipse\workspace\mavenSSM\src\main\java"

（4）自动生成文件
如果是在eclipse 中，选择generatorConfig.xml文件，击右键先择Run AS——>Maven Build… ——>在Goals框中输入：mybatis-generator:generate

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eclipse安装mybatis-generator

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