Analysis of JDK dynamic proxy examples in java
1. Description
Java provides a dynamic proxy class Proxy. Proxy is not a class of what we call proxy objects, but provides a static method for creating proxy objects. Method (newProxyInstance) to obtain the proxy object.
2. Example
public class HelloWorld {
public static void main(String[] args) {
// 获取代理对象
ProxyFactory factory = new ProxyFactory();
SellTickets proxyObject = factory.getProxyObject();
proxyObject.sell();
}
}
// 卖票接口
interface SellTickets {
void sell();
}
// 火车站，火车站具有卖票功能，所以需要实现SellTickets接口
class TrainStation implements SellTickets {
@Override
public void sell() {
System.out.println("火车站卖票");
}
}
// 代理工厂，用来创建代理对象
class ProxyFactory {
private TrainStation station = new TrainStation();
public SellTickets getProxyObject() {
// 使用Proxy获取代理对象
/**
* newProxyInstance() 方法参数说明：
* ClassLoader loader: 类加载器，用于加载代理类，使用真实对象的类加载器即可
* Class<?>[] interfaces：真实对象所实现的接口，代理模式真实对象和代理对象实现相同的接口
* InvocationHandler h：代理对象的调用处理程序
*/
SellTickets sellTickets = (SellTickets) Proxy.newProxyInstance(
station.getClass().getClassLoader(),
new InvocationHandler() {
/**
* InvocationHandle中invoke方法参数说明：
* proxy：代理对象
* method：对应于在代理对象上调用的方法的Method实例
* args：代理对象调用接口方法是传递的实际参数
*/
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("代理点收取一些服务费用（JDK动态代理方法）");
// 执行真实对象
Object result = method.invoke(station, args);
return result;
}
});
return sellTickets;
}
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