MyBatis: 自定义ObjectFactory

1.创建DefaultObjectFactory的子类

package factory;


import java.util.List;
import java.util.Properties;

import org.apache.ibatis.reflection.factory.DefaultObjectFactory;

import tju.MyBtsBasic.domain.Book;

public class AmadeusObjectFactory extends DefaultObjectFactory{
  String author;
  
  static
  {
    System.out.println("in my diy object factory......");
  }
  
  @Override
  public Object create(Class type) {
      return super.create(type);
    }

    public Object create(Class type, List constructorArgTypes, List constructorArgs) {
      Class<?> classToCreate = resolveInterface(type);
      @SuppressWarnings("unchecked")
      // we know types are assignable
      Object created = super.create(classToCreate, constructorArgTypes, constructorArgs);
      advice(created);
      return created;
    }

    public void setProperties(Properties properties) {
      author=properties.getProperty("author");
    }
    
    public Object advice(Object object)
    {
      if(Book.class.isAssignableFrom(object.getClass()))
          {
              Book b=(Book)object;
              b.setAuthor(author);
              
              
          }
      return object;
      
    }
  
  

}

2.配置自定义ObjectFactory

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
  <!--  XML 配置文件包含对 MyBatis 系统的核心设置 -->
<configuration>
  <!-- 指定 MyBatis 所用日志的具体实现 -->
  <properties resource="db.properties">
  <property name="password" value="root"/>
  </properties>
  
  
  <settings>
    <setting name="logImpl" value="LOG4J"/>
    <!-- 要使延迟加载生效必须配置下面两个属性 -->
    <setting name="lazyLoadingEnabled" value="true"/>
    <setting name="aggressiveLazyLoading" value="false"/>
    <!--  
    <setting name="defaultExecutorType" value="BATCH"/>
    -->
    <setting name="defaultExecutorType" value="SIMPLE"/>
  </settings>
  
  <objectFactory type="factory.AmadeusObjectFactory">
  <property name="author" value="liuxueyuan"/>
  </objectFactory>
  
  <environments default="mysql">
  <!-- 环境配置，即连接的数据库。 -->
    <environment id="mysql">
             <transactionManager type="JDBC"></transactionManager>
             <dataSource type="factory.c3p0DataSourceFactory">
                 <property name="driverClass" value="com.mysql.jdbc.Driver"/>
                 <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/mybatis"/>
                 <property name="user" value="${username}"/>
                <property name="password" value="${password}"/>
                 <property name="initialPoolSize" value="5"/>
                 <property name="maxPoolSize" value="20"/>
                 <property name="minPoolSize" value="5"/>
             </dataSource>
         </environment>
  </environments>
  <!-- mappers告诉了MyBatis去哪里找持久化类的映射文件 -->
  <mappers>
    
    <mapper class="tju.MyBtsBasic.mapper.BookMapper"/>
  
  </mappers>
</configuration>