Java Read the properties file

First, Target: Read the properties file, get the class name to generate the object

Second, class

1.movable.java

public interface Movable {void run ();

　　

2.car.java

Public class Car implements movable {public void run () {System.out.println ("Car running .....");}}

　　

3.spring.properties

PS: "=" cannot have spaces on either side

Vechiletype=com.tong.spring.factory.car

　　

4.test.java

public class Test {@org. junit.testpublic void Test () {//reads the properties file, obtains the class name to generate the object properties Pros = new properties (); try {/ /1. Read the class name to instantiate Pros.load (Test.class.getClassLoader (). getResourceAsStream ("com/tong/spring/factory/ Spring.properties ")); String Vechiletype = Pros.getproperty ("Vechiletype");//2. Use reflection to load classes and instantiate classes with newinstance () object o = Class.forName ( Vechiletype). newinstance (); Movable m = (movable) o;m.run ();} catch (Exception e) {e.printstacktrace ();}}}

　　

5. Operation Result:

6. If you change to spring to read the XML file, when spring is configured, add Applicationcontext.xml

<?xml version= "1.0" encoding= "UTF-8"? ><beans xmlns= "Http://www.springframework.org/schema/beans"       Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"       xsi:schemalocation= "http://www.springframework.org/ Schema/beans           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">  <bean id=" vehicle "class=" Com.tong.spring.factory.Car ">  </bean>  <!--more beans definitions go here--></ Beans>

　　

7.test.java change to the following

public class Test {@org. junit.testpublic void Test () {Beanfactory factory = new Classpathxmlapplicationcontext (" Applicationcontext.xml "); Object o = Factory.getbean (" vehicle "); Movable m = (movable) o;m.run ();}}

　　

Java Read the properties file