Java的generator工具类，数据库生成实体类和映射文件-蒲公英云

Java的generator工具类，数据库生成实体类和映射文件

`首先需要几个jar包：`

freemarker-2.3.23.jar

log4j-1.2.16.jar

mybatis-3.2.3.jar

mybatis-generator-core-1.3.2.jar

mysql-connector-java-5.1.28-bin.jar

ojdbc14.jar

这些jar包网上都有下载的地方

`xml配置文件：generatorConfig.xml`

代码如下

<?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>
    <!-- 生成复杂的xml文件 -->
    <context id="MySQLContext" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <!-- 配置前置分隔符和后置分隔符 -->
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <!-- 配置注释信息 -->
        <commentGenerator>
            <!-- 不生成注释 -->
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true"/>
            <property name="addRemarkComments" value="true"/>
        </commentGenerator>
        <!-- 数据库连接配置 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/logisticsDB" userId="root" password="123456">
        </jdbcConnection>
        <!-- targetPackage：生成实体类存放的包名， targetProject：指定目标项目路径，可以使用相对路径或绝对路径 -->
        <javaModelGenerator targetPackage="com.entity" targetProject="src">
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 配置SQL映射器Mapper.xml文件的属性 -->
        <sqlMapGenerator targetPackage="com.dao" targetProject="src"/>
        <!-- type="XMLMAPPER"：所有的方法都在XML中，接口调用依赖XML文件 -->
        <javaClientGenerator targetPackage="com.dao" type="XMLMAPPER" targetProject="src"/>
        <!-- 生成所有表的映射 -->
        <table tableName="%"></table>        
    </context>
</generatorConfiguration>

`Java：Generator类`

package generator;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
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;
public class Generator { 
    /* * targetRuntime="MyBatis3Simple", 不生成Example */
    public void generateMyBatis() { 
        // MBG执行过程中的警告信息
        List<String> warnings = new ArrayList<String>();
        // 当生成的代码重复时，覆盖原代码
        boolean overwrite = true;
        String generatorFile = "/generatorConfig.xml";
        // String generatorFile = "/generator/generatorConfigExample.xml";
        // 读取MBG配置文件
        InputStream is = Generator.class.getResourceAsStream(generatorFile);
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config;
        try { 
            config = cp.parseConfiguration(is);
            DefaultShellCallback callback = new DefaultShellCallback(overwrite);
            // 创建MBG
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
            // 执行生成代码
            myBatisGenerator.generate(null);
        } catch (IOException e) { 
            e.printStackTrace();
        } catch (XMLParserException e) { 
            e.printStackTrace();
        } catch (InvalidConfigurationException e) { 
            e.printStackTrace();
        } catch (SQLException e) { 
            e.printStackTrace();
        } catch (InterruptedException e) { 
            e.printStackTrace();
        }
        for (String warning : warnings) { 
            System.out.println(warning);
        }
    }
    public static void main(String[] args) { 
        Generator generator = new Generator();
        generator.generateMyBatis();
    }
}