mybatis自动生成mapper.xml文件，model文件

1. 首先我们新建一个genneratorConfigMysql.xml文件, 把里面的数据库，用户名，数据库表都进行相应的替换，

domainObjectName是要生成的model文件名称

tableName 数据库表名

<?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="beginingDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <commentGenerator>
            <property name="supressDate" value="true"/>
            <property name="addRemarkComments" value="true"/>
        </commentGenerator>
        
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
            connectionURL="jdbc:mysql://xxxx?characterEncoding=utf8" userId="xxxx"
            password="xxxx" >
        </jdbcConnection>
        <javaModelGenerator targetPackage="test.qa.model" targetProject="src/main/java">
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <sqlMapGenerator targetPackage="mybatis" targetProject="src/main/resources/"/>
        <javaClientGenerator type="XMLMAPPER" targetPackage="test.ke.dao" targetProject="src/main/java"/>
        <table tableName="xxxx"  domainObjectName="xxxx"/>
    </context>
</generatorConfiguration>

2. 新建一个java文件，如下所示，运行即可生成对应的mapper.xml文件，model文件. 需要生成其他的数据库表的时候，只要替换genneratorConfigMysql.xml文件中的数据库表名和要生成的model文件名即可

package test.util;

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

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * 生成model文件和xml文件。 需要修改generatorConfigMySql.xml文件中的表和数据库
 */
public class Generator {
    public static void main(String[] args) throws Exception{
        List<String> warnings = new ArrayList<>();
        boolean overwrite = true;
        InputStream is = Generator.class.getResourceAsStream("/generatorConfigMySql.xml");
        if(is == null){
            System.out.println("null");
        }
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(is);
        is.close();
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
        for(String warning : warnings){
            System.out.println(warning);
        }

    }
}