package utils;
import java.io.InputStream;
import java.util.*;
/**
*创建bean对象的工厂
*
*
* bean 在计算机英语中 有可重用组件的含义
*/
public class BeanFactory {
// 定义个properties对象
private static Properties properties;
/*
* 用于存放bean实例的容器
* */
private static Map<String,Object> bean = new HashMap<String,Object>();
static {
try {
properties= new Properties();
// 获取properties流对象
InputStream resourceAsStream = BeanFactory.class.getClassLoader().getResourceAsStream("bean.properties");
// 加载类
properties.load(resourceAsStream);
Enumeration keys = properties.keys();
// 枚举遍历
while(keys.hasMoreElements()){
String key = keys.nextElement().toString();
System.out.printf(key);
String beanPath = properties.getProperty(key);
System.out.printf(beanPath);
// 使用反射创建对象
Object o = Class.forName(beanPath).newInstance();
bean.put(key,o);
}
} catch (Exception e) {
throw new ExceptionInInitializerError("初始化异常!");
}
}
/**
* 根据bean名称获取bean对象
* */
public static Object getBean(String beanName){
return bean.get(beanName);
}
}
手写一个BeanFactory创建对象工厂类
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转载自blog.csdn.net/qq_37950333/article/details/106631365
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