使用CGLib实现动态代理

CGLib动态代理
       程序执行时通过ASM（开源的Java字节码编辑库，操作字节码）jar包动态地为被代理类生成一个代理子类，通过该代理子类创建代理对象，由于存在继承关系，所以父类不能使用final修饰。
CGLib动态代理实现

1、导入两个架包

       

package com.zzu.cglib;

public class CalculatorService {
	public int add(int a, int b) {
		int result = a+b;
		return result;
	}
	
	public int sub(int a, int b) {
		int result = a-b;
		return result;
	}

	public int mul(int a, int b) {
		int result = a*b;
		return result;
	}

	public int div(int a, int b) {
		int result = a/b;
		return result;
	}
}

public class ProxyFactory {
	
	static CalculatorService target;
	static Callback callback = new MethodInterceptor() {
		
		@Override
		public Object intercept(Object proxy, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
			String name = method.getName();
			System.out.println(this.getClass().getName()+"：The "+name+" method begins.");
			System.out.println(this.getClass().getName()+"：Parameters of the "+name+" method： ["+args[0]+","+args[1]+"]");
			Object result = method.invoke(target, args);
			System.out.println(this.getClass().getName()+"：Result of the "+name+" method："+result);
			System.out.println(this.getClass().getName()+"：The add method ends.");
			return result;
		}
	};
	
	public static Object getProxy(CalculatorService target) {
		ProxyFactory.target = target;
		Enhancer enhancer = new Enhancer();//创建CGLib的核心类对象
		enhancer.setSuperclass(target.getClass());//设置父类
		enhancer.setCallback(callback);//设置回调
		return enhancer.create();//创建代理对象
		
	}
}

public class Test {
	public static void main(String[] args) {
		CalculatorService calculatorService =  (CalculatorService) ProxyFactory.getProxy(new CalculatorService());
		int result = calculatorService.add(1, 1);
		System.out.println(result);
	}
}

运行结果