beanfactory.java

来自「一个用户管理系统的例子,作的很好,有前端,有后台,增加,删除,修改,查找都可以实」· Java 代码 · 共 47 行

package com.allanlxf.ums.util;

import java.io.InputStream;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Map;
import java.util.Properties;

public class BeanFactory
{
    private static Map<String, Object> objectPool = new Hashtable<String, Object>();

    static
    {
        Properties config = new Properties();
        InputStream in = BeanFactory.class
                .getResourceAsStream("beans-config.properties");
        if (in == null)
        {
            throw new ExceptionInInitializerError(
                    "no file:beans-config found error!");
        }

        try
        {
            config.load(in);
            in.close();
            Enumeration ids = config.propertyNames();
            while (ids.hasMoreElements())
            {
                String id = (String) ids.nextElement();
                String className = config.getProperty(id);
                Object instance = Class.forName(className).newInstance();
                objectPool.put(id, instance);
            }
        } catch (Exception e)
        {
            e.printStackTrace();
            throw new ExceptionInInitializerError("failed to init bean pools!");
        }
    }

    public static Object getBean(String id)
    {
        return objectPool.get(id);
    }
}