1.接口
interface ISubject{
public void eat();
}
2.主业务
class realSubject implements ISubject{ //主要业务
@Override
public void eat() {
System.out.println ("饿了要吃饭" );
}
}
3.代理业务
class ProxySubject implements ISubject{
private ISubject subject;
public ProxySubject(ISubject subject){
this.subject=subject;
}
public void prepare(){
System.out.println ("准备吃饭" );
}
public void afterEat(){
System.out.println ("洗刷刷" );
}
@Override
public void eat() {
this.prepare ();
this.subject.eat ();//
this.afterEat ();
}
}
4.工厂
class Factory {
private Factory() {
}
//方法一：
public static <T> T getInstance(String realClassName) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
Class cls = Class.forName ( realClassName );
return (T) cls.newInstance ( );
}
public static <T> T getInstance(String proxyClassName, Object targent) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
Class cls1 = Class.forName ( proxyClassName );
Constructor constructor = cls1.getConstructor ( cls1.getInterfaces ( )[0] );
return (T) constructor.newInstance ( targent );
}
public static <T> T getInstance(String proxyClassName, String realClassName) {
T realObject= null;
try {
realObject = Factory.getInstance ( realClassName );
} catch (ClassNotFoundException e) {
e.printStackTrace ( );
} catch (IllegalAccessException e) {
e.printStackTrace ( );
} catch (InstantiationException e) {
e.printStackTrace ( );
}
T proxyObject= null;
try {
proxyObject = Factory.getInstance ( proxyClassName,realObject );
} catch (ClassNotFoundException e) {
e.printStackTrace ( );
} catch (NoSuchMethodException e) {
e.printStackTrace ( );
} catch (IllegalAccessException e) {
e.printStackTrace ( );
} catch (InvocationTargetException e) {
e.printStackTrace ( );
} catch (InstantiationException e) {
e.printStackTrace ( );
}
return proxyObject;
}
}
5.测试
public class Test {
public static void main(String[] args) throws IllegalAccessException, InstantiationException, ClassNotFoundException,
NoSuchMethodException, InvocationTargetException {
//方法一的测试
/*ISubject subject= subject = Factory.getInstance ("反射.反射与代理设计模式.ProxySubject"
,Factory.getInstance ( "反射.反射与代理设计模式.realSubject" ) );
subject.eat();*/
//方法二测试
ISubject subject=Factory.getInstance ( "反射.反射与代理设计模式.ProxySubject",
"反射.反射与代理设计模式.realSubject" );
subject.eat ();
}
}
