Using reflection and a combination of profiles, the dynamic switching method for operating a text column

com.itcast.reflect Package ; 

Import a java.io.InputStream ; 
Import the java.lang.reflect.Method ; 
Import the java.util.Properties ; 

/ ** 
* @author newcityman 
* @date 2019/8/8 - 23:07 
* framework classes: use reflection and properties profile binding 
* without changing the java code, modify the configuration file method, to change the switch operating method 
* / 
public class RefelectTest { 
 public static void main (String [] args ) throws Exception { 
//. 1, can create any object, a method of performing any 
// 1.1 creating properties object 
the properties Pro = new new the properties () ; 
// 1.2 loading configuration file, is converted to a set 
// Get class 1.2.1 profiles directory
. ClassLoader classLoader = RefelectTest class.getClassLoader () ; 
the InputStream ClassLoader.getResourceAsStream IS = ( "pro.properties") ; 
pro.load (IS) ; 
// 2, acquired data configuration file defined 
String className = pro.getProperty ( "className") ; 
String methodName = pro.getProperty ( "methodName") ; 
// 3, the class is loaded into memory 
Class CLS = Class. forName (className) ; 
// 4, to create objects 
Object obj = cls.newInstance () ; 
// 5, the object acquired 
Method, Method = cls.getMethod (methodName) ; 
Method.invoke (obj) ; 

} 
}