Mybatis generator Mybatis generator怎样自动生成代码

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

<?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>
      <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
      <property name="suppressAllComments" value="true" />
    </commentGenerator>
    <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
    
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
       connectionURL="***" userId="***"
       password="***"/>
    
            
    <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和 
      NUMERIC 类型解析为java.math.BigDecimal -->
    <javaTypeResolver>
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <!-- targetProject:生成PO类的位置 -->
    <javaModelGenerator targetPackage="com.sun.mybatis.dto"
      targetProject=".\src\test\java">
      <!-- enableSubPackages:是否让schema作为包的后缀 -->
      <property name="enableSubPackages" value="false" />
      <!-- 从数据库返回的值被清理前后的空格 -->
      <property name="trimStrings" value="true" />
    </javaModelGenerator>
    <!-- targetProject:mapper映射文件生成的位置 -->
    <sqlMapGenerator targetPackage="com.sun.mybatis.mapper" 
      targetProject=".\src\test\java">
      <!-- enableSubPackages:是否让schema作为包的后缀 -->
      <property name="enableSubPackages" value="false" />
    </sqlMapGenerator>
    <!-- targetPackage：mapper接口生成的位置 -->
    <javaClientGenerator type="XMLMAPPER"
      targetPackage="com.sun.mybatis.dao" 
      targetProject=".\src\test\java">
      <!-- enableSubPackages:是否让schema作为包的后缀 -->
      <property name="enableSubPackages" value="false" />
    </javaClientGenerator>
    <!-- 指定数据库表 -->
    <table schema="" tableName="b_staff" ></table>
    <table schema="" tableName="b_contents" ></table>

 <!--    <table tableName="CTAS_FEE_BASE" domainObjectName="FeeBase"
        enableCountByExample="false" enableUpdateByExample="false"
        enableDeleteByExample="false" enableSelectByExample="false"
        selectByExampleQueryId="false"> -->
    <!-- 有些表的字段需要指定java类型
     <table schema="" tableName="">
      <columnOverride column="" javaType="" />
    </table> -->
  </context>
</generatorConfiguration>

import java.io.File;
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.internal.DefaultShellCallback;

/**
 * @author szy 
 * @version 创建时间：2018-6-4 下午9:26:54
 * 
 */
public class MybatisGenerator {

  /**
   * @param args
   */
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    try {
      MybatisGenerator generatorSqlmap = new MybatisGenerator();
      generatorSqlmap.generator();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public void generator() throws Exception{

    List<String> warnings = new ArrayList<String>();
    boolean overwrite = true;
    //指定 逆向工程配置文件
    File configFile = new File("E:/java-workspace/myblog/src/main/resources/mybatis-generator-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);
  }
}