Java的generator工具类，数据库生成实体类和映射文件

分手后的思念是犯贱 2022-09-04 02:53 209阅读 0赞

## `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">
    
    <generatorConfiguration>
    	
    	<context id="MySQLContext" targetRuntime="MyBatis3Simple" defaultModelType="flat">
    		
    		<property name="beginningDelimiter" value="`"/>
    		<property name="endingDelimiter" value="`"/>
    		
    		<commentGenerator>
    			
    			<property name="suppressAllComments" value="true"/>
    			<property name="suppressDate" value="true"/>
    			<property name="addRemarkComments" value="true"/>
    		</commentGenerator>
    		
    		<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/logisticsDB" userId="root" password="123456">
    		</jdbcConnection>
    		
    		
    		<javaModelGenerator targetPackage="com.entity" targetProject="src">
    			<property name="trimStrings" value="true"/>
    		</javaModelGenerator>
    		
    		
    		<sqlMapGenerator targetPackage="com.dao" targetProject="src"/>
    		
    		
    		<javaClientGenerator targetPackage="com.dao" type="XMLMAPPER" targetProject="src"/>
    								
    		
    		<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();
    	}
    }