浅谈-Java设计模式之动态代理

Object invoke(Object proxy, Method method, Object[] args) throws Throwable

package com.ant;
 
public interface Hello {
 
    public void say();
}
 

package com.ant;
 
public class HelloImpl implements Hello {
 
    @Override
    public void say() {
        System.out.println("hellw world!");
 
    }
 
}

package com.ant;
 
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
 
public class HelloHandle implements InvocationHandler{
 
    private Object obj;
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        Object result = null;
        doBefore();
        result = method.invoke(    obj,args);
        doAfter();
        return result;
    }
 
    public HelloHandle(Object obj){
        super();
        this.obj = obj;
        System.out.println("初始化invocationHandler实例");
    }
 
    private void doBefore(){
        System.out.println("代理前");
    }
    private void doAfter(){
        System.out.println("代理后");
    }
}

package com.ant;
 
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
 
public class HelloTest {
 
    public static void main(String[] args) {
        Hello hello = new HelloImpl();
        InvocationHandler handle = new HelloHandle(hello);
 
        //动态创建一个代理对象的类
         
        Hello proxy = (Hello)Proxy.newProxyInstance(hello.getClass().getClassLoader(),hello.getClass().getInterfaces(), handle);
        proxy.say();
        System.out.println(proxy.getClass().getName());
    }
}

浅谈-Java设计模式之动态代理