Java设计模式（七）：代理模式Proxy（静态代理模式+动态代理模式）-优快云博客

本文链接：https://blog.youkuaiyun.com/hardwin/article/details/51519879

本文通过具体示例对比展示了静态代理与动态代理的区别与实现方式。静态代理通过直接定义代理类来实现，而动态代理则利用Java反射机制在运行时创建代理对象。

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静态代理

package com.iter.devbox.staticProxy;

public interface Star {
	
	public void sing();

}

package com.iter.devbox.staticProxy;

public class RealStar implements Star {

	@Override
	public void sing() {
		System.out.println(this.getClass().getName() + ".sing()");
	}

	
}

package com.iter.devbox.staticProxy;

public class StarHandler implements Star {

	private Star realStar;
	
	public StarHandler(Star realStar) {
		super();
		this.realStar = realStar;
	}

	@Override
	public void sing() {
		System.out.println(this.getClass().getName() + ".sing() 执行之前");
		realStar.sing();
		System.out.println(this.getClass().getName() + ".sing() 执行之后");
	}

}

package com.iter.devbox.staticProxy;

public class Client {

	public static void main(String[] args) {
		new StarHandler(new RealStar()).sing();
	}

}

动态代理

package com.iter.devbox.dynamicProxy;

public interface Star {
	
	public void sing();

}

package com.iter.devbox.staticProxy;

public class RealStar implements Star {

	@Override
	public void sing() {
		System.out.println(this.getClass().getName() + ".sing()");
	}

	
}

package com.iter.devbox.dynamicProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class StarHandler implements InvocationHandler {
	
	Object star;
	
	public StarHandler(Object star) {
		super();
		this.star = star;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		System.out.println("代理方法执行前");
		Object obj = method.invoke(star, args);
		System.out.println("代理方法执行后");
		return obj;
	}

}

package com.iter.devbox.dynamicProxy;

import java.lang.reflect.Proxy;

public class Client {

	public static void main(String[] args) {
		Star realStar = new RealStar();
		// 调用处理器
		StarHandler handler = new StarHandler(realStar);
		// 利用JDK动态代理生成代理类接口
		Star star = (Star) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), 
				new Class[]{Star.class}, handler);
		star.sing();
	}

}