免责声明 - 这是一个作业，我试图弄清楚为什么我的代码给了我一个错误。
背景：
所以任务基本上是对 SimpleChat 进行编辑，这是一个客户端-服务器框架，老师已经给了我们代码。我正在尝试从服务器端实现一个聊天控制台，并实现以主题标签开头的操作。所以我在我的服务器文件（称为“EchoServer”）中有一个“handleMessageFromServer”方法，并试图从服务器控制台（恰当地命名为“服务器控制台”）调用它。我将相关代码放在下面，并解释一下：
我会编辑我放的东西，我会把整个文件和评论一起放。
下面是“EchoServer”文件。与我的问题相关的更重要的位是“handleMessageFromServer”方法，我试图从另一个文件调用并传入信息，以及 EchoServer 构造函数，我在另一个文件中使用它来创建一个实例。
import java.io.*;
import ocsf.server.*;
import common.*;
/**
* This class overrides some of the methods in the abstract
* superclass in order to give more functionality to the server.
*
* @author Dr Timothy C. Lethbridge
* @author Dr Robert Laganière
* @author François Bélanger
* @author Paul Holden
* @version July 2000
*/
public class EchoServer extends AbstractServer
{
//Class variables *************************************************
/**
* The default port to listen on.
*/
final public static int DEFAULT_PORT = 5555;
//Constructors ****************************************************
/*
* An interface type variable, will allow the implementation of the
* Display method in the client.
*
*/
public ChatIF server;
/**
* Constructs an instance of the echo server.
*
* @param port The port number to connect on.
*/
public EchoServer(int port, ChatIF server)
{
super(port);
this.server = server;
}
//Instance methods ************************************************
/**
* This method handles any messages received from the client.
*
* @param msg The message received from the client.
* @param client The connection from which the message originated.
*/
public void handleMessageFromClient
(Object msg, ConnectionToClient client)
{
System.out.println("Message received: " + msg + " from " + client);
this.sendToAllClients(msg);
}
/**
* This method handles any messages received from the server console.
*
* @param msg The message received from the server.
* @param server The connection from which the message originated.
*/
public void handleMessageFromServer(String message)
{
if (message.charAt(0) == '#')
{
serverCommand(message);
}
else
{
server.display(message);
this.sendToAllClients("SERVER MSG> " + message);
}
}
/*This method allows us to run commands from the server console
*
*/
public void serverCommand(String command)
{
if (command.equalsIgnoreCase("quit")) System.exit(0); /////Shuts the system down
else if (command.equalsIgnoreCase("#stop")) stopListening(); ///Stops listening for connections
else if (command.equalsIgnoreCase("#close")) ///////closes all connections
{
try close();
catch(IOException ex) {
server.display("Could not close connection");
}
}
else if (command.toLowerCase().startsWith("#setport")) /////Sets port when not listening
{
if (!isListening() && getNumberOfClients() == 0)
{
//////If there are no connected clients, and
//////we're not listening for new ones, we can
////assume that the server is closed (close() has been
////called.
String portNum = command.substring(s.indexOf("<") + 1)
portNum = portnum.substring(0, s.indexOf(">"));
int num = Integer.parseInt(portNum);
setPort(num);
server.display("The server port has been changed to port" + getPort());
}
else
{
server.display("Port cannot be changed");
}
else if (command.equalsIgnoreCase("#start")) ///////starts listening for clients if not already
{
if (!isListening())
{
try listen();
catch (Exception ex)
{
server.display("Could not listen for clients!");
}
}
else
{
server.display("Already listening for clients");
}
}
else if (message.equalsIgnoreCase("#getport")) //////gets the port number
{
server.display("Current port: " + Integer.toString(getPort()));
}
}
}
/**
* This method overrides the one in the superclass. Called
* when the server starts listening for connections.
*/
protected void serverStarted()
{
System.out.println
("Server listening for connections on port " + getPort());
}
/**
* This method overrides the one in the superclass. Called
* when the server stops listening for connections.
*/
protected void serverStopped()
{
System.out.println
("Server has stopped listening for connections.");
}
//Class methods ***************************************************
/**
* This method is responsible for the creation of
* the server instance (there is no UI in this phase).
*
* @param args[0] The port number to listen on. Defaults to 5555
* if no argument is entered.
*/
public static void main(String[] args)
{
int port = 0; //Port to listen on
try
{
port = Integer.parseInt(args[0]); //Get port from command line
}
catch(Throwable t)
{
port = DEFAULT_PORT; //Set port to 5555
}
EchoServer sv = new EchoServer(port);
try
{
sv.listen(); //Start listening for connections
}
catch (Exception ex)
{
System.out.println("ERROR - Could not listen for clients!");
}
}
}
//End of EchoServer class
下面是 ServerConsole 文件，我在其中创建 EchoServer 类的一个实例，以便我可以传递信息。该文件的目的是创建一个环境，服务器端可以在该环境中为 SimpleChat 应用程序发送文本。然后文本被传递回 EchoServer 类，在那里它可以用于命令（所有命令都以标签开头）。在尝试调用 echoServer.handleMessageFromServer(message) 时，我目前在“接受”方法中遇到错误。错误是“未为类型 EchoServer 定义方法 handleMessageFromServer(String)”。
import java.io.*;
import client.*;
import common.*;
/**
* This class constructs the UI for a chat client. It implements the
* chat interface in order to activate the display() method.
* Warning: Some of the code here is cloned in ServerConsole
*
* @author François Bélanger
* @author Dr Timothy C. Lethbridge
* @author Dr Robert Laganière
* @version July 2000
*/
public class ServerConsole implements ChatIF
{
//Class variables *************************************************
/**
* The default port to connect on.
*/
final public static int DEFAULT_PORT = 5555;
//Instance variables **********************************************
/**
* The instance of the server that created this ConsoleChat.
*/
//Constructors ****************************************************
EchoServer echoServer;
/**
* Constructs an instance of the ClientConsole UI.
*
* @param host The host to connect to.
* @param port The port to connect on.
*/
public ServerConsole(int port)
{
this.echoServer = new EchoServer(port);
}
//Instance methods ************************************************
/**
* This method waits for input from the console. Once it is
* received, it sends it to the client's message handler.
*/
public void accept()
{
try
{
BufferedReader fromConsole =
new BufferedReader(new InputStreamReader(System.in));
String message;
while (true)
{
message = fromConsole.readLine();
///////////////ADDED FOR E50B MA/ND
echoServer.handleMessageFromServer(message);
///////////////ADDED FOR E50B MA/ND
}
}
catch (Exception ex)
{
System.out.println
("Unexpected error while reading from console!");
}
}
/**
* This method overrides the method in the ChatIF interface. It
* displays a message onto the screen.
*
* @param message The string to be displayed.
*/
public void display(String message)
{
System.out.println(message);
}
//Class methods ***************************************************
/**
* This method is responsible for the creation of the Client UI.
*
* @param args[0] The host to connect to.
*/
public static void main(String[] args)
{
int port = 0; //The port number
try
{
String host = args[0];
}
catch(ArrayIndexOutOfBoundsException e)
{
String host = "localhost";
}
ServerConsole chat= new ServerConsole(DEFAULT_PORT);
chat.accept(); //Wait for console data
}
}
//End of ConsoleChat class
我想我可能没有正确构建实例，但是非常感谢任何帮助！