自定义2个接口subject1,subject2
1 package proxy; 2 3 public interface Subject1 { 4 public void doSomething(); 5 } 6 7 8 9 package proxy; 10 11 public interface Subject2 { 12 public void doOtherthing(); 13 }
定义2个真实的RealSubject1(implements subject1),RealSubject2(implements subject1,subject2)
1 package proxy; 2 3 public class RealSubject1 implements Subject1 { 4 5 @Override 6 public void doSomething() { 7 // TODO Auto-generated method stub 8 System.out.println("realSubject1 invoke from Subject1"); 9 } 10 11 } 12 13 package proxy; 14 15 public class RealSubject2 implements Subject2,Subject1{ 16 17 @Override 18 public void doOtherthing() { 19 System.out.println("realSubject2 invoke from Subject2"); 20 21 } 22 @Override 23 public void doSomething() { 24 System.out.println("realSubject2 invoke from Subject1"); 25 26 } 27 28 }
创建一个invocationHandler
1 package proxy; 2 3 import java.lang.reflect.InvocationHandler; 4 import java.lang.reflect.Method; 5 6 public class DynanicSubject implements InvocationHandler { 7 private Object o1; 8 public DynanicSubject(Object obj){ 9 this.o1=obj; 10 } 11 @Override 12 public Object invoke(Object proxy, Method method, Object[] args) 13 throws Throwable { 14 System.out.println("执行前"); 15 method.invoke(o1, args); 16 System.out.println("执行后"); 17 return null; 18 } 19 20 }
创建测试类
1 package proxy; 2 3 import java.lang.reflect.InvocationHandler; 4 import java.lang.reflect.Proxy; 5 6 public class Client { 7 public static void main(String[] args) { 8 //分别创建真实类对象以及handler 9 Subject1 sub1=new RealSubject1(); 10 RealSubject2 sub2=new RealSubject2(); 11 12 InvocationHandler hander=new DynanicSubject(sub1); 13 InvocationHandler hander2=new DynanicSubject(sub2); 14 //创建动态代理类 （由于RealSubject2实现2个接口，因此下面进行2此转换，分别调用2个方法） 15 Subject1 su=(Subject1)Proxy.newProxyInstance(hander.getClass().getClassLoader(), sub1.getClass().getInterfaces(), hander); 16 Subject2 su2=(Subject2)Proxy.newProxyInstance(hander2.getClass().getClassLoader(), sub2.getClass().getInterfaces(), hander2); 17 su.doSomething(); 18 su2.doOtherthing(); 19 Subject1 su3=(Subject1)Proxy.newProxyInstance(hander2.getClass().getClassLoader(), sub2.getClass().getInterfaces(), hander2); 20 su3.doSomething(); 21 } 22 }
执行结果：
执行前
realSubject1 invoke from Subject1
执行后
执行前
realSubject2 invoke from Subject2
执行后
执行前
realSubject2 invoke from Subject1
执行后