工厂模式 jdbc 面向接口dao 开发 单例
package com.itheima.utils; import java.io.IOException;
import java.io.InputStream;
import java.util.Properties; import com.itheima.dao.UserDao; /**
* 引入工厂,用于生成一些对象,为了生成的BeanFactory对象时,
* 不会生成多个对象(因为BeanFactory作为一个工厂,只要有一个它的对象就可以 了),可以引入单例模式
*
* 2.业务层要调用 Dao的什么 样的实现类,可以放入到配置文件
* 3.读取配置文件
* @author wangli
*
*/
public class BeanFactory { private BeanFactory(){}//私有构造 private static BeanFactory instance = new BeanFactory(); //再提供一个公有的方法
public static BeanFactory getInstance(){
return instance;
} private static String DAO;//用于存储从bean.properties文件 中读取的值
static{
try {
InputStream is = BeanFactory.class.getClassLoader().getResourceAsStream("bean.properties");
Properties p = new Properties();
p.load(is);
DAO = p.getProperty("dao");
} catch (Exception e) {
e.printStackTrace();
}
} public UserDao getUserDaoInstance(){
try {
Class clz = Class.forName(DAO);
return (UserDao)clz.newInstance();//通过反射生成对象 UserDaoMySqlImpl的对象 UserDaoDom4jImpl的对象
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
} }
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alt="" />
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