1.pom檔案

<?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>mybatis</groupId>
    <artifactId>nxgc</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
        <dependency>
            <groupId
 
>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId
 
>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.oracle/ojdbc6 -->
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.2.0.1.0</version>
        </dependency>
    </dependencies>
</project>

2.配置檔案nxgc_config.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="testTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自動生成的註釋 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>


        <!--資料庫連線的資訊：驅動類、連線地址、使用者名稱、密碼 -->
        <!--MySQL-->
        <!--<jdbcConnection driverClass="com.mysql.jdbc.Driver"-->
                        <!--connectionURL="jdbc:mysql://localhost:3306/root" -->
                        <!--userId="root"-->
                        <!--password="root">-->
        <!--</jdbcConnection>-->
        <!--Oracle-->
        <jdbcConnection
                driverClass="oracle.jdbc.driver.OracleDriver"
                connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:orcl"
                userId="LYH"
                password="lyh123">
        </jdbcConnection>


        <!-- 預設false，把JDBC DECIMAL 和 NUMERIC 型別解析為 Integer，為 true時把JDBC DECIMAL
            和 NUMERIC 型別解析為java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>


        <!-- targetProject:生成PO類的位置 -->
        <javaModelGenerator targetPackage="com.ssm.pojo"
                            targetProject=".\src\main\java">
            <!-- enableSubPackages:是否讓schema作為包的字尾 -->
            <property name="enableSubPackages" value="false" />
            <!-- 從資料庫返回的值被清理前後的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>


        <!-- targetProject:mapper對映檔案生成的位置 -->
        <sqlMapGenerator targetPackage="com.ssm.dao"
                         targetProject=".\src\main\java">
            <!-- enableSubPackages:是否讓schema作為包的字尾 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>


        <!-- targetPackage：mapper介面生成的位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.ssm.dao"
                             targetProject=".\src\main\java">
            <!-- enableSubPackages:是否讓schema作為包的字尾 -->
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>


        <!-- 指定資料庫表 -->
        <table tableName="USER_MEG"></table>
    </context>
</generatorConfiguration>

3.主程式mybatis_nxgc.java

package com.ssm;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.exception.InvalidConfigurationException;
import org.mybatis.generator.exception.XMLParserException;
import org.mybatis.generator.internal.DefaultShellCallback;

import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class mybatis_nxgc {

    public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("D:\\IntelliJ_idea\\nxgc\\src\\main\\resources\\nxgc_config.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }
}

完成以上三步之後，就可以執行主程式自動生成。