关于spring框架中的IOC的部分逻辑复现

package com.hfyy.spring.basic;
import com.hfyy.spring.mapper.UserMapper;
import com.hfyy.spring.service.UserService;
import java.util.ResourceBundle;
public final class BeanFactory {
   private static ResourceBundle applicationContext;
    static{
        applicationContext= ResourceBundle.getBundle("applicationContext");
    }
    public static UserMapper getUsemapper(){
        UserMapper userMapper1=null;
        String userMapper = applicationContext.getString("userMapper");
        try {
            Class aClass = Class.forName(userMapper);
             userMapper1 = (UserMapper)aClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return userMapper1;
    }
    public static UserService getUserServiceImpl(){
        UserService userService=null;
        try {
            Class aClass = Class.forName(applicationContext.getString("userService"));
            userService= (UserService)aClass.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return userService;
    }
   public static  T getBean(String key, Class clazz){
        T cast=null;
       try {
           Class aClass = Class.forName(applicationContext.getString(key));
           Object object = aClass.newInstance();
           cast = clazz.cast(object);
       } catch (Exception e) {
           e.printStackTrace();
       }
       return cast;
   }
   public Object getBeanByKey(String key){
        Object object=null;
       try {
           Class aClass = Class.forName(applicationContext.getString(key));
           object  = aClass.newInstance();
       } catch (Exception e) {
           e.printStackTrace();
       }
     return object;
   }
}