mudclient.java

Java实现简易Mud

package mud;

import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.io.*;
import java.util.*;
import mud.Mud.*;

public class MudClient {

  public static void main(String[] args){

    try{
      String hostname = args[0];
      String mudname = args[1];
      String placename = null;
      if(args.length>2) placename = args[2];
      RemoteMudServer server = (RemoteMudServer)Naming.lookup(
          "rmi://"+hostname+"/"+Mud.mudPrefix+mudname );
      RemoteMudPlace location =null;
      if(placename ==null) location = server.getEntrance();
      else location = (RemoteMudPlace)server.getNamedPlace(placename);
      System.out.println("welcome to "+mudname);
      String name = getLine("Enter your name : ");
      String description = getMultiLine("Please describe what" +
          "People see when they look at you : ");
      PrintWriter myout = new PrintWriter(System.out);
      MudPerson me = new MudPerson(name,description,myout);

//      int pri=Thread.currentThread().getPriority();
//      Thread.currentThread().setPriority(-1);

      runMud(location ,me);
    }
    catch(Exception e){
      System.out.println(e);
      System.out.println("Usage: java MudClient <host> <mud> [<place>] ");
      System.exit(1);
    }
  }

  public static void runMud(RemoteMudPlace entrance,MudPerson me)
      throws RemoteException {
    RemoteMudPlace location = entrance;
    String myname = me.getName();
    String placename = null;
    String mudname = null;
    try{
      location.enter(me,myname,myname+" has entered the MUD.");
      mudname = location.getServer().getMudName();
      placename = location.getPlaceName();
      look(location);
    }
    catch(Exception e){
      System.out.println(e);
      System.exit(1);
    }

    for(;;){
      try{
        try{ Thread.sleep(200); } catch( InterruptedException e ){}
        String line = getLine(mudname + "."+placename+">");
        String cmd,arg;
        int i = line.indexOf( ' ');
        if(i==-1) {cmd=line; arg=null;}
        else{
          cmd=line.substring(0,i).toLowerCase();
          arg = line.substring(i+1);
        }
        if (arg == null) arg = "";
        if(cmd.equals("look")) look(location);
        else if(cmd.equals("examine"))
          System.out.println(location.examineThing(arg));
        else if(cmd.equals("describe")){
          try{
            RemoteMudPerson p = location.getPerson(arg);
            System.out.println(p.getDescription());
          } catch(RemoteException e){
            System.out.println(arg + " is having technical difficulties.No description is available.");
          }
        } else if(cmd.equals("go")){
          location = location.go(me,arg);
          mudname = location.getServer().getMudName();
          placename = location.getPlaceName();
          look(location);
        } else if(cmd.equals("say")){
          location.speak(me,arg);
        } else if(cmd.equals("do")){
          location.act(me,arg);
        } else if(cmd.equals("talk")){
            try{
              RemoteMudPerson p = location.getPerson(arg);
              String msg = getLine("What do you want to Sya?:");
              p.tell(myname + "Says \""+msg+"\"");
            }catch(RemoteException e){
              System.out.println(arg + " is having technical difficuties .Can't talk to them");
            }
        } else if(cmd.equals("change")){
          me.setDescription(getMultiLine("Describe yourself for others:"));
        } else if(cmd.equals("create")){
          if(arg.length() == 0)
            throw new IllegalArgumentException("name excepted");
          String desc = getMultiLine("Please describe the " + arg +":");
          location.createThing(me,arg,desc);
        } else if(cmd.equals("destroy")){
          location.destoryThing(me,arg);
        } else if(cmd.equals("open")){
          if(arg.length() == 0) throw new IllegalArgumentException("direction excepted");
          String name = getLine("what is the name of place there?: ");
          String back = getLine("What is the direction from " + "there back to here?: ");
          String desc = getMultiLine("Please describe " +name + ":");
          location.createPlace(me,arg,back,name,desc);
        } else if(cmd.equals("close")){
          if(arg.length() == 0)
            throw new IllegalArgumentException("derection excepted");
          location.close(me,arg);
        } else if(cmd.equals("link")){
          if(arg.length() == 0)
            throw new IllegalArgumentException("derection excepted");
          String host = getLine("What host are you linking to?: ");
          String mud = getLine("What is the name of the MUD ont that host?: ");
          String place = getLine("What is the place name int that MUD?: ");
          location.linkTo(me,arg,host,mud,place);
          System.out.println("Don't forget to make a link from there back to here");
        } else if(cmd.equals("dump")){
          if(arg.length() == 0)
            throw new IllegalArgumentException("filename excepted");
          String password = getLine("Password:");
          location.getServer().dump(password,arg);
        } else if(cmd.equals("quit")){
          try{location.exit(me,myname+ " has quit.");}catch(Exception e){}
          System.out.println("Bye");
          System.out.flush();
          System .exit(0);
        } else if(cmd.equals("help")){
          System.out.println(help);
        } else {
          System.out.println("Unknown command. try help.");
        }
      } catch(MudException e){
        if( e instanceof NoSuchThing)
          System.out.println("There isn't any such thing here." );
        else if(e instanceof NoSuchPerson)
          System.out.println("There isn't anyon by that name here.");
        else if(e instanceof NoSuchExit)
          System.out.println("There isn't an exit in that direction.");
        else if(e instanceof NoSuchPlace)
          System.out.println("There isn't any such place.");
        else if(e instanceof ExitAlreadyExists)
          System.out.println("There is already an exit in that direction");
        else if(e instanceof PlaceAlreadyExists)
          System.out.println("There is already a place with that name");
        else if(e instanceof LinkFailed)
          System.out.println("That exit is not functioning...");
        else if(e instanceof BadPassword)
          System.out.println("Invalid Password");
        else if(e instanceof NotThere)
          System.out.println("You can't do that when you're not there");
        else if(e instanceof AlreadyThere)
          System.out.println("You can't go there; you're already there.");
      } catch(RemoteException e){
        System.out.println("The MUD is having technical difficulties");
        System.out.println("Perhaps the server has crashed.");
        System.out.println("Try using the help command.");
      } catch(Exception e){
        System.out.println("Syntax or other error:");
        System.out.println(e);
        System.out.println("Try using the help command.");
      }
    }
  }

  public static void look(RemoteMudPlace location)
      throws RemoteException,MudException{
    String mudname = location.getServer().getMudName();
    String placename = location.getPlaceName();
    String description = location.getDescription();
    Vector things = location.getThings();
    Vector names = location.getNames();
    Vector exits = location.getExits();

    System.out.println("you are in: " + placename + " of the Mud : " +mudname);
    System.out.println(description);
    System.out.print("Things here: ");
    for(int i=0;i<things.size();i++){
      if(i>0) System.out.print(",");
      System.out.print(things.elementAt(i));
    }

    System.out.println("\nPeople here: ");
    for(int i=0;i<names.size();i++){
      if(i>0) System.out.print(",");
      System.out.print(names.elementAt(i));
    }

    System.out.println("\nExits here: ");
    for(int i=0;i<exits.size();i++){
      if(i>0) System.out.print(",");
      System.out.print(exits.elementAt(i));
    }
    System.out.println();
    System.out.flush();
  }

  static BufferedReader in  = new BufferedReader(new InputStreamReader(System.in));


  public static String getLine(String prompt){
    String line = null;
    do{
      try{
        System.out.print(prompt);
        System.out.flush();
        line = in.readLine();
        if(line != null) line = line.trim();
      }
      catch(Exception e) {}
    } while ((line == null) || (line.length() == 0 ));
    return line;
  }

  public static String getMultiLine(String prompt){
    String text = "";
    for(;;){
      try{
          BufferedReader br = in;
          System.out.println(prompt);
          System.out.println("You can enter multiple lines.  " +
                      "End with a '.' on a line by itself.\n" +
                      "Or enter a '<<' followed by a filename");
          System.out.flush();
          String line;
          while ((line = br.readLine()) != null) {
            if(line.equals(".")) break;
            if(line.trim().startsWith("<<")) {
              String filename = line.trim().substring(2).trim();
              br = new BufferedReader(new FileReader(filename));
              continue;
            } else {
              text += line + "\n";
            }
            if(text != null) return text;
            else System.out.println("Please enter at least one line.");
        }
      }
      catch(Exception e){}
    }
  }

static final String help =
        "Commands are:\n" +
        "look: Look around\n" +
        "examine <thing>: examine the named thing in more detail\n" +
        "describe <person>: describe the named person\n" +
        "go <direction>: go in the named direction (i.e. a named exit)\n" +
        "say <message>: say something to everyone\n" +
        "do <message>: tell everyone that you are doing something\n" +
        "talk <person>: talk to one person.  Will prompt for message\n" +
        "change: change how you are described.  Will prompt for input\n" +
        "create <thing>: create a new thing.  Prompts for description \n" +
        "destroy <thing>: destroy a thing.\n" +
        "open <direction>: create an adjoining place. Prompts for input\n"+
        "close <direction>: close an exit from this place.\n" +
        "link <direction>: create an exit to an existing place,\n" +
        "     perhaps on another server.  Will prompt for input.\n" +
        "dump <filename>: save server state.  Prompts for password\n" +
        "quit: leave the Mud\n" +
	"help: display this message";
}