springIOC思想和反射

bean.properties

accountService=com.itcast.service.impl.AccountServiceImpl
accountDao=com.itcast.dao.impl.AccountDaoImpl

 

beanfactory

 

package com.itcast.factory;

import java.io.IOException;
import java.io.InputStream;
import java.util.*;

/**
 * @Date 2019/9/6 18:20
 * by mocar
 *      用反射机制获取对象
 */
public class BeanFactory {
    private static Properties properties=null;
    private static Map beans;//实例放到容器中，实现单例
    static {
        try {
            properties=new Properties();
            InputStream resourceAsStream = BeanFactory.class.getClassLoader().getResourceAsStream("bean.properties");
            properties.load(resourceAsStream);
            beans=new HashMap();//保存实例对象，单例
          /*
            方式一
            Enumeration