ObjectFactory采用单列模式设置工厂模式

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package util;import java.io.InputStream;import java.util.HashMap;import java.util.Map;import java.util.Properties;// 采用单例模式来设计工厂public class ObjectFactory {// 定义一个集合用于存储对象的名字和实例private static Map<String, Object> factory;private static ObjectFactory instance = null;private static Properties props = null;public static Properties getProps() {return props;}private ObjectFactory() {}static {// 初始化模型工厂factory = new HashMap<String, Object>();// 初始化对象工厂映射文件objectNameprops = new Properties();try {// 通过当前类加载器去读取classpath下的文件流InputStream is = ObjectFactory.class.getResourceAsStream("/object.properties");props.load(is);} catch (Exception e) {e.printStackTrace();}}// 根据对象名称获得工厂内的实例（必须要检查你需要的对象在工厂中有没有）// 当你请求该对象时，才临时初始化返回public static Object getObject(String objectName) {if (instance == null)instance = new ObjectFactory();Object object=null;try {object = factory.get(objectName);if (object == null) {// 如果为null，证明这个对象在工厂中尚未初始化，实例化它并把它放入工厂中object = Class.forName(props.getProperty(objectName)).newInstance();factory.put(objectName, object);System.out.println("init "+objectName);} else {System.out.println("return "+objectName);}} catch (Exception e) {e.printStackTrace();}return object;}}

读取的配置文件object.properties

transaction=transaction.impl.MyBatisTransactionManagerImpl
userDao=daoImpl.UserDaoImpl
companyDao=daoImpl.CompanyDaoImpl
productDao=daoImpl.ProductDaoImpl
userService=service.impl.UserServiceImpl
productService=service.impl.ProductServiceImpl
lendingperiodService=service.impl.LendingPeriodServiceImpl
companyService=service.impl.CompanyServiceImpl
productTypeService=service.impl.ProductTypeServiceImpl
newsService=service.impl.NewsServiceImpl
applyService=service.impl.ApplyServiceImpl

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