设计模式之——代理模式(静态代理）

代理类与委托类之间存在关联关系。它们共用一个接口。代理类自身并不真正的实现服务。而是通过调用委托类的实现。

如下代码示例：

接口类：

package proxypackage;
public interface HelloService {
	public void getName(String name);
	public void echoMessage(String msg);
}

接口实现真正实现类即委托类：

package proxypackage;
public class HelloServiceImpl implements HelloService{
	public void echoMessage(String msg) {
		System.out.println("echo:" + msg);
	}
	public void getName(String name) {
		System.out.println("The name is :" + name);
	}
}

接口实现类代理类

package proxypackage;
public class HelloServiceProxy implements HelloService {
	private HelloService helloService;
	public HelloServiceProxy(HelloService helloService){
		this.helloService = helloService;
	}
	public void echoMessage(String msg) {
		System.out.println("helloService proxy begin--");
		helloService.echoMessage(msg);
	}
	public void getName(String name) {
		System.out.println("helloService proxy");
		helloService.getName(name);
	}
}

调用类，具体实现。

package proxypackage;
public class client {
	public static void main(String[] args) {
		HelloService helloService = new HelloServiceImpl();
		HelloService proxy = new HelloServiceProxy(helloService);
		proxy.echoMessage("good");
		proxy.getName("zhangshan");
	}
}

输出结果为：

helloService proxy begin--
echo:good
helloService proxy
The name is :zhangshan