工厂模式与面向接口配合实现深度解耦

package com.azer.shop.utils; import java.io.InputStream; import java.util.Properties; import com.azer.shop.constant.Constants; @SuppressWarnings("serial") public class LoadProperty extends Properties { private static LoadProperty instance; public static LoadProperty getInstance() { if (instance != null) { return instance; } else { makeInstance(); return instance; } } private static synchronized void makeInstance() { if (instance == null) { instance = new LoadProperty(); } } private LoadProperty() { InputStream inputStream = getClass().getResourceAsStream(Constants.FILE_NAME); try { load(inputStream); } catch (Exception e) { System.out.println("配置文件出错!!"); e.printStackTrace(); } } public static String getClassName(String classNameKey) { return LoadProperty.getInstance().getProperty(classNameKey); } }