使用Java配置类，配置MyBatisGenerator最简单配置

1.首先需要引入MyBatis的maven依赖

       <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>

2.配置Java实体类

package com.snowy.manager.config;

import org.mybatis.generator.api.JavaTypeResolver;
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.api.Plugin;
import org.mybatis.generator.config.*;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.internal.DefaultShellCallback;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

/**
 * Created by win7 on 2018/5/17.
 */
public class GeneratorConfig {

    private static final Properties props=new Properties();
    public static void main(String[] args){
        try {
        /*配置xml配置项*/
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        Configuration config = new Configuration();
        Context context = new Context(ModelType.CONDITIONAL);
        context.setTargetRuntime("MyBatis3Simple");
        context.setId("defaultContext");
        //自动识别数据库关键字，默认false，如果设置为true，
        //根据SqlReservedWords中定义的关键字列表；一般保留默认值，遇到数据库关键字（Java关键字），
        //使用columnOverride覆盖
        context.addProperty("autoDelimitKeywords","true");
        //生成的Java文件的编码
        context.addProperty("javaFileEncoding","utf-8");
        context.addProperty("beginningDelimiter","`");
        context.addProperty("endingDelimiter","`");
        //格式化java代码
        context.addProperty("javaFormatter","org.mybatis.generator.api.dom.DefaultJavaFormatter");
        //格式化xml代码
        context.addProperty("xmlFormatter","org.mybatis.generator.api.dom.DefaultXmlFormatter");

        //格式化信息
        PluginConfiguration pluginConfiguration = new PluginConfiguration();
        pluginConfiguration.setConfigurationType("org.mybatis.generator.plugins.SerializablePlugin");
        pluginConfiguration.setConfigurationType("org.mybatis.generator.plugins.ToStringPlugin");
        context.addPluginConfiguration(pluginConfiguration);



        //设置是否生成注释
        CommentGeneratorConfiguration commentGeneratorConfiguration = new CommentGeneratorConfiguration();
        commentGeneratorConfiguration.addProperty("suppressAllComments","true");
        commentGeneratorConfiguration.addProperty("suppressDate","true");
        context.setCommentGeneratorConfiguration(commentGeneratorConfiguration);

        //设置连接数据库
        JDBCConnectionConfiguration jdbcConnectionConfiguration = new JDBCConnectionConfiguration();
        jdbcConnectionConfiguration.setDriverClass("com.mysql.jdbc.Driver");
        jdbcConnectionConfiguration.setConnectionURL("jdbc:mysql://localhost:3306/sb_01");
        jdbcConnectionConfiguration.setPassword("root");
        jdbcConnectionConfiguration.setUserId("root");
        context.setJdbcConnectionConfiguration(jdbcConnectionConfiguration);


        JavaTypeResolverConfiguration javaTypeResolverConfiguration = new JavaTypeResolverConfiguration();
        //是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.）
        javaTypeResolverConfiguration.addProperty("forceBigDecimals","false");
        context.setJavaTypeResolverConfiguration(javaTypeResolverConfiguration);


        //生成实体类的地址
        JavaModelGeneratorConfiguration javaModelGeneratorConfiguration = new JavaModelGeneratorConfiguration();
        javaModelGeneratorConfiguration.setTargetPackage("com.snowy.manager.model");
        javaModelGeneratorConfiguration.setTargetProject("src/main/java");
        javaModelGeneratorConfiguration.addProperty("enableSubPackages","false");
        javaModelGeneratorConfiguration.addProperty("trimStrings","true");
        context.setJavaModelGeneratorConfiguration(javaModelGeneratorConfiguration);

        //生成的xml的地址
        SqlMapGeneratorConfiguration sqlMapGeneratorConfiguration = new SqlMapGeneratorConfiguration();
        sqlMapGeneratorConfiguration.setTargetProject("src/main/resources");
        sqlMapGeneratorConfiguration.setTargetPackage("mappers");
        sqlMapGeneratorConfiguration.addProperty("enableSubPackages","false");
        context.setSqlMapGeneratorConfiguration(sqlMapGeneratorConfiguration);

        //生成mapxml对应client，也就是接口dao
         JavaClientGeneratorConfiguration javaClientGeneratorConfiguration = new JavaClientGeneratorConfiguration();
         javaClientGeneratorConfiguration.setTargetPackage("com.snowy.manager.dao");
         javaClientGeneratorConfiguration.setTargetProject("src/main/java");
         javaClientGeneratorConfiguration.setConfigurationType("XMLMAPPER");
         javaClientGeneratorConfiguration.addProperty("enableSubPackages","false");
         context.setJavaClientGeneratorConfiguration(javaClientGeneratorConfiguration);




        TableConfiguration tableConfiguration = new TableConfiguration(context);
        tableConfiguration.setTableName("userrole");
        tableConfiguration.setCountByExampleStatementEnabled(true);
        tableConfiguration.setUpdateByExampleStatementEnabled(true);
        tableConfiguration.setDeleteByExampleStatementEnabled(true);
        tableConfiguration.setInsertStatementEnabled(true);
        tableConfiguration.setDeleteByPrimaryKeyStatementEnabled(true);
        tableConfiguration.setSchema("sb_01");
        GeneratedKey generatedKey=new GeneratedKey("id","MySql",true,null);
        tableConfiguration.setGeneratedKey(generatedKey);
        context.addTableConfiguration(tableConfiguration);

        config.addContext(context);

        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
        } catch (InvalidConfigurationException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

虽然配置的比较繁琐，但是应该还是很清晰的。适合初学者观看学习。

基本上是按找Mybatis官网的规范来进行配置的
这里写图片描述
按照xml文件中所需要的内容进行相应的配置

<?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">
<!-- 配置生成器 -->
<generatorConfiguration>
    <!--执行generator插件生成文件的命令： call mvn mybatis-generator:generate -e -->
    <!-- 引入配置文件 -->
    <properties resource="mybatisGeneratorinit.properties"/>
    <!--classPathEntry:数据库的JDBC驱动,换成你自己的驱动位置 可选 -->
    <!--<classPathEntry location="D:\generator_mybatis\mysql-connector-java-5.1.24-bin.jar" /> -->

    <!-- 一个数据库一个context -->
    <!--defaultModelType="flat" 大数据字段，不分表 -->
    <context id="mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <!-- 自动识别数据库关键字，默认false，如果设置为true，根据SqlReservedWords中定义的关键字列表；
        一般保留默认值，遇到数据库关键字（Java关键字），使用columnOverride覆盖 -->
        <property name="autoDelimitKeywords" value="true" />
        <!-- 生成的Java文件的编码 -->
        <property name="javaFileEncoding" value="utf-8" />
        <!-- beginningDelimiter和endingDelimiter：指明数据库的用于标记数据库对象名的符号，比如ORACLE就是双引号，MYSQL默认是`反引号； -->
        <property name="beginningDelimiter" value="`" />
        <property name="endingDelimiter" value="`" />

        <!-- 格式化java代码 -->
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter"/>
        <!-- 格式化XML代码 -->
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />

        <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />

        <!-- 注释 -->
        <commentGenerator >
            <property name="suppressAllComments" value="false"/><!-- 是否取消注释 -->
            <property name="suppressDate" value="true" /> <!-- 是否生成注释代时间戳-->
        </commentGenerator>

        <!-- jdbc连接 -->
        <jdbcConnection driverClass="${jdbc_driver}" connectionURL="${jdbc_url}" userId="${jdbc_user}" password="${jdbc_password}" />
        <!-- 类型转换 -->
        <javaTypeResolver>
            <!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- 生成实体类地址 -->
        <javaModelGenerator targetPackage="com.snowy.manager.model" targetProject="${project}" >
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成mapxml文件 -->
        <sqlMapGenerator targetPackage="mappers" targetProject="${resources}" >
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- 生成mapxml对应client，也就是接口dao -->
        <javaClientGenerator targetPackage="com.snowy.manager.dao" targetProject="${project}" type="XMLMAPPER" >
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>
        <!-- table可以有多个,每个数据库中的表都可以写一个table，tableName表示要匹配的数据库表,也可以在tableName属性中通过使用%通配符来匹配所有数据库表,只有匹配的表才会自动生成文件 -->
        <table tableName="user" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true">
            <property name="constructorBased" value="false" />
            <!-- 数据库表主键 -->
            <generatedKey column="id" sqlStatement="JDBC" identity="true" />
        </table>
    </context>
</generatorConfiguration>

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原文链接：https://blog.csdn.net/taxuexumei/article/details/80362706