文章目录

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cglib动态代理

cglib是基于继承的方式实现的

是继承目标类从而产生代理类

springaop底层使用的就是cglib的动态代理

package com.itheima.cjlibproxy;
import net.sf.cglib.proxy.Callback;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import java.lang.reflect.Method;
/**
 * @author healer
 * @Description CglibProxyUtils
 * @data 2024-06-08 15:21
 */
public class CglibProxyUtils {
    public static Object createProxy(Object targetClass) {
        // 创建一个 enhancer
        Enhancer enhancer = new Enhancer();
//        需要指定创建出来的代理类的父类
        enhancer.setSuperclass(targetClass.getClass());
//        增强
        enhancer.setCallback(new MethodInterceptor() {
            @Override
            public Object intercept(Object o, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
                long start = System.currentTimeMillis();
                Object result = method.invoke(targetClass, args);
                long end = System.currentTimeMillis();
                System.out.println("-------->方法耗时:" + (end - start) + "ms");
                return result;
            }
        });
//        创建代理对象
        return enhancer.create();
    }
}

package com.itheima.cjlibproxy;
import com.itheima.jdkProxy.JdkProxyUtil;
import com.itheima.service.DeptService;
import com.itheima.service.impl.DeptServiceImpl;
/**
 * @author healer
 * @Description CglibProxyDemo
 * @data 2024-06-08 15:29
 */
public class CglibProxyDemo {
    public static void main(String[] args) {
        DeptService deptService = new DeptServiceImpl();
        DeptService proxyDeptService = (DeptService) CglibProxyUtils.createProxy(deptService);
        proxyDeptService.update();
    }
}