package cn.itcast_06;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class MyInvocationHandler implements InvocationHandler {
private Object target; // 目标对象
public MyInvocationHandler(Object obj) {
this.target = obj;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
System.out.println("权限校验");
Object result = method.invoke(target, args);
System.out.println("日志举例");
return result; // 返回的是代理对象
}
}
package cn.itcast_06;
import java.lang.reflect.Proxy;
public class Test {
public static void main(String[] args) {
UserDao ud = new UserDaoImpl();
ud.add();
ud.delete();
ud.update();
ud.find();
System.out.println("----------");
// 我们要创建一个动态代理对象
// Proxy类中有一个方法可以创建动态代理对象
// public static Object newProxyInstance(ClassLoader loader,Class<?>[]
// interfaces,InvocationHandler h)
// 我准备对ud对象做一个代理对象
MyInvocationHandler handler = new MyInvocationHandler(ud);
UserDao proxy = (UserDao) Proxy.newProxyInstance(ud.getClass()
.getClassLoader(), ud.getClass().getInterfaces(), handler);
proxy.add();
proxy.delete();
proxy.update();
proxy.find();
System.out.println("----------");
StudentDao sd = new StudentDaoImpl();
MyInvocationHandler handler2 = new MyInvocationHandler(sd);
StudentDao proxy2 = (StudentDao) Proxy.newProxyInstance(sd.getClass().getClassLoader(),
sd.getClass().getInterfaces(), handler2);
proxy2.login();
proxy2.regist();
}
}
