Spring 笔记 2（动态代理）

一、动态代理的实现:

    1.实现InvocationHandler实现相应的方法

public class SecurityHandler implements InvocationHandler {

	private Object targetObject;
	
	public Object newProxy(Object targetObject) {
		this.targetObject = targetObject;
		return Proxy.newProxyInstance(targetObject.getClass().getClassLoader(), 
									  targetObject.getClass().getInterfaces(), 
									  this);
					
	}
	
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		checkSecurity();
		Object ret = null;
		try {
			ret = method.invoke(this.targetObject, args);
		}catch(Exception e) {
			e.printStackTrace();
			throw new java.lang.RuntimeException(e);
		}
		return ret;
	}

	private void checkSecurity() {
		System.out.println("----------checkSecurity()---------------");
	}
	
}

  2.测试方法代码：

 

SecurityHandler handler = new SecurityHandler();

UserManager userManager = (UserManager)handler.newProxy(new UserManagerImpl());