动态代理
public class Test {
public static void main(String[] args) {
StudentImp si = new StudentImp();
si.login();
si.submit();
System.out.println("-------------------------------");
MyInvocationHandler m = new MyInvocationHandler(si);
Student s = (Student) Proxy.newProxyInstance(si.getClass().getClassLoader(), si.getClass().getInterfaces(), m);
s.login();
s.submit();
}
}
class MyInvocationHandler implements InvocationHandler {
private Object target;
public MyInvocationHandler(Object target) {
this.target = target;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("权限检查");
method.invoke(target, args);
System.out.println("写入日志");
return null;
}
}
class StudentImp implements Student {
@Override
public void login() {
System.out.println("登陆");
}
@Override
public void submit() {
System.out.println("提交");
}
}
interface Student {
public void login();
public void submit();
}
