用类加载器的方式管理资源和配置文件

ReflectTest.java

package ZHANG.Reflect;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.util.Collection;import java.util.Properties;public class ReflectTest {public static void main(String[] args) {try {//一种方法加载属性文件//InputStream ips = new FileInputStream("config.properties");//另一种方法加载属性文件 注意:该文件放到了src目录下//InputStream ips = ReflectTest.class.getClassLoader().getResourceAsStream("ZHANG/Reflect/config.properties");InputStream ips = ReflectTest.class.getResourceAsStream("config.properties");Properties props = new Properties();props.load(ips);ips.close();String classname = props.getProperty("CLASSNAME");Collection conllections = (Collection) Class.forName(classname).newInstance();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (InstantiationException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {}}}

config.properties 

CLASSNAME = java.util.List;