1.开发环境

开发工具:idea

构建工具:maven

2.创建项目

2.1使用idea创建maven项目

2.2配置pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>mybatisgenerator</groupId>
    <artifactId>mybatisgenerator</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <!--测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.1</version>
        </dependency>
    </dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.7</version>
        </plugin>
    </plugins>
</build>
    
</project>

配置完成后idea右侧Maven project中就会多一个插件

2.3编写generatorConfig.xml配置文件

在resources目录下面创建generatorConfig.xml（文件名必须一致）。

<?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>
    <!--数据库连接驱动包物理路径-->
    <classPathEntry location="/Users/cloud/Downloads/cloud/jar/mysql-connector-java-8.0.15.jar" />

    <context id="mysql" targetRuntime="MyBatis3">
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/itcast?useUnicode=true"
                        userId="root"
                        password="root">
            <property name="nullCatalogMeansCurrent" value="true"/>
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!--生成pojo，targetPackage：包名；targetProject：物理路径-->
        <javaModelGenerator targetPackage="com.cloud.pojo" targetProject="/Users/cloud/Downloads/cloud/myProject/springmvctest/mybatisgenerator/src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--xml生成路径-->
        <sqlMapGenerator targetPackage="com.cloud.mapper"  targetProject="/Users/cloud/Downloads/cloud/myProject/springmvctest/mybatisgenerator/src/main/java">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!--mapper生成的路径-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.cloud.mapper"  targetProject="/Users/cloud/Downloads/cloud/myProject/springmvctest/mybatisgenerator/src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>
        <!--需要生成的表-->
        <table tableName="user" domainObjectName="User"/>
    </context>
</generatorConfiguration>

下图为目录结构

3.生成****

双击mybatis-generator:generate就ok了，是不是很简单啊。