代码文件目录：

 RMI：

MyRemote

package Chapter11_ProxyPattern.RMI;import java.rmi.Remote;
import java.rmi.RemoteException;public interface MyRemote extends Remote {public String sayHello() throws RemoteException;
}

MyRemoteClient

package Chapter11_ProxyPattern.RMI;import java.rmi.Naming;public class MyRemoteClient {public static void main(String[] args) {new MyRemoteClient().go();}public void go(){try{MyRemote service = (MyRemote) Naming.lookup("rmi://127.0.0.1/RemoteHello");String s = service.sayHello();System.out.println(s);}catch (Exception ex){ex.printStackTrace();}}
}

MyRemoteImpl

package Chapter11_ProxyPattern.RMI;import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;public class MyRemoteImpl extends UnicastRemoteObject implements MyRemote {private static final long serialVersion = 1L;public String sayHello() throws RemoteException {return "Server says: Hey!";}public MyRemoteImpl()throws RemoteException{}public static void main(String[] args) {try{MyRemote service = new MyRemoteImpl();Naming.rebind("RemoteHello",service);}catch (Exception ex){ex.printStackTrace();}}
}

能够远程监控的糖果机：

在上一章的代码的基础上做一些修改

GumballMachine

public class GumballMachineextends UnicastRemoteObject implements GumballMachineRemote{private static final long serialVersionUID = 2L;//加上地理位置支持String location;State soldOutState;State noQuarterState;State hasQuarterState;State soldState;State winnerState;State state = soldOutState;int count = 0;public GumballMachine(String location,int numberGumballs) throws RemoteException {soldOutState = new SoldOutState(this);noQuarterState = new NoQuarterState(this);hasQuarterState = new HasQuarterState(this);soldState = new SoldState(this);winnerState = new WinnerState(this);this.location = location;this.count = numberGumballs;if (numberGumballs > 0) {state = noQuarterState;}}

GumballMachineRemote

package Chapter11_ProxyPattern.Origin;import java.rmi.Remote;
import java.rmi.RemoteException;public interface GumballMachineRemote extends Remote {public int getCount() throws RemoteException;public String getLocation() throws RemoteException;public State getState() throws RemoteException;
}

GumballMachineTestDrive

package Chapter11_ProxyPattern.Origin;import java.rmi.Naming;/*** @Author 竹心* @Date 2023/8/19**/public class GumballMachineTestDrive {public static void main(String[] args) {GumballMachineRemote gumballMachine = null;int count;if (args.length < 2) {System.out.println("GumballMachine <name> <inventory>");System.exit(1);}try {count = Integer.parseInt(args[1]);gumballMachine =new GumballMachine(args[0], count);Naming.rebind("//" + args[0] + "/gumballmachine", gumballMachine);} catch (Exception e) {e.printStackTrace();}}
}

GumballMonitor

package Chapter11_ProxyPattern.Origin;import java.rmi.RemoteException;/*** @Author 竹心* @Date 2023/8/20**///糖果监视器
public class GumballMonitor {GumballMachineRemote gumballMachine;public GumballMonitor(GumballMachineRemote machine){this.gumballMachine = machine;}public void report(){try{System.out.println("Gumball Machine: "+this.gumballMachine.getLocation());System.out.println("Current inventory: "+this.gumballMachine.getCount()+" gumballs");System.out.println("Current State: "+this.gumballMachine.getState());}catch (RemoteException e){e.printStackTrace();}}
}

GumballMonitorTestDrive

package Chapter11_ProxyPattern.Origin;import java.rmi.Naming;public class GumballMonitorTestDrive {public static void main(String[] args) {String[] location = {"rmi://127.0.0.1/gumballmachine","rmi://127.0.0.1/gumballmachine","rmi://127.0.0.1/gumballmachine"};if (args.length >= 0){location = new String[1];location[0] = "rmi://" + args[0] + "/gumballmachine";}GumballMonitor[] monitor = new GumballMonitor[location.length];for (int i=0;i < location.length; i++) {try {GumballMachineRemote machine =(GumballMachineRemote) Naming.lookup(location[i]);monitor[i] = new GumballMonitor(machine);System.out.println(monitor[i]);} catch (Exception e) {e.printStackTrace();}}for (int i=0; i < monitor.length; i++) {monitor[i].report();}}
}

五个状态类：

同样的修改：

public class HasQuarterState implements State {private static final long serialVersionUID = 2L;Random randomWinner = new Random(System.currentTimeMillis());