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public class MyProxy
{
public Object getProxy(Object object)
{
MyHandler myHandler = new MyHandler();
myHandler.setObject(object);
return Proxy.newProxyInstance(Target.class.getClassLoader(), object
.getClass().getInterfaces(), myHandler);
}
}
一个类似拦截器的类
public class Interceptor
{
public void before()
{
System.out.println("before");
}
public void after()
{
System.out.println("after");
}
}
一个实现InvocationHandler的handal类
public class MyHandler implements InvocationHandler
{
private Object object;
private Interceptor interceptor = new Interceptor();
public void setObject(Object object)
{
this.object = object;
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable
{
Object result = null;
//关键的地方
interceptor.before();
result = method.invoke(object, args);
interceptor.after();
return result;
}
}
最后一个测试类
public class Client
{
public static void main(String[] args)
{
TargetInterface target = new Target();
MyProxy myProxy = new MyProxy();
TargetInterface proxy = (TargetInterface)myProxy.getProxy(target);
proxy.doSomething();
}
}