Question

我是java的新手。我正在使用NetBeans 8.0.2 我开始了一个新项目（Java - ＆gt; Java Class Libary）我已经放了两个类并运行我的代码。但是没有错误，在成功构建项目后没有显示输出。

我非常感谢你的帮助。

我的第一堂课是ChatServer＆amp;我的第二个是ClientServer！

import java.net.*;
import java.io.*;

public class ChatServer
{  private Socket          socket   = null;
   private ServerSocket    server   = null;
   private DataInputStream streamIn =  null;

   public ChatServer(int port)
   {  try
      {  System.out.println("Binding to port " + port + ", please wait  ...");
         server = new ServerSocket(port);  
         System.out.println("Server started: " + server);
         System.out.println("Waiting for a client ..."); 
         socket = server.accept();
         System.out.println("Client accepted: " + socket);
         open();
         boolean done = false;
         while (!done)
         {  try
            {  String line = streamIn.readUTF();
               System.out.println(line);
               done = line.equals(".bye");
            }
            catch(IOException ioe)
            {  done = true;
            }
         }
         close();
      }
      catch(IOException ioe)
      {  System.out.println(ioe); 
      }
   }
   public void open() throws IOException
   {  streamIn = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
   }
   public void close() throws IOException
   {  if (socket != null)    socket.close();
      if (streamIn != null)  streamIn.close();
   }
   public static void main(String args[])
   {  ChatServer server = null;
      if (args.length != 1)
         System.out.println("Usage: java ChatServer port");
      else
         server = new ChatServer(Integer.parseInt(args[0]));
   }
}

import java.net.*;
import java.io.*;

public class ChatClient
{  private Socket socket              = null;
   private DataInputStream  console   = null;
   private DataOutputStream streamOut = null;

   public ChatClient(String serverName, int serverPort)
   {  System.out.println("Establishing connection. Please wait ...");
      try
      {  socket = new Socket(serverName, serverPort);
         System.out.println("Connected: " + socket);
         start();
      }
      catch(UnknownHostException uhe)
      {  System.out.println("Host unknown: " + uhe.getMessage());
      }
      catch(IOException ioe)
      {  System.out.println("Unexpected exception: " + ioe.getMessage());
      }
      String line = "";
      while (!line.equals(".bye"))
      {  try
         {  line = console.readLine();
            streamOut.writeUTF(line);
            streamOut.flush();
         }
         catch(IOException ioe)
         {  System.out.println("Sending error: " + ioe.getMessage());
         }
      }
   }
   public void start() throws IOException
   {  console   = new DataInputStream(System.in);
      streamOut = new DataOutputStream(socket.getOutputStream());
   }
   public void stop()
   {  try
      {  if (console   != null)  console.close();
         if (streamOut != null)  streamOut.close();
         if (socket    != null)  socket.close();
      }
      catch(IOException ioe)
      {  System.out.println("Error closing ...");
      }
   }
   public static void main(String args[])
   {  ChatClient client = null;
      if (args.length != 2)
         System.out.println("Usage: java ChatClient host port");
      else
         client = new ChatClient(args[0], Integer.parseInt(args[1]));
   }
}

Answer 1

您需要同时运行ChatClient和ChatServer（因此两个类中的主要方法）。此外，您需要传递命令行参数。我们来看看main()中的ChatClient：

public static void main(String args[])
   {  ChatClient client = null;
      if (args.length != 2)
         System.out.println("Usage: java ChatClient host port");
      else
         client = new ChatClient(args[0], Integer.parseInt(args[1]));
   }

您正在解析参数以检索服务器名称和端口。这是使用适当参数运行这些类的示例：

java ChatServer 55444
java ChatClient 127.0.0.1 55444

Here是一个简短的教程，介绍了在Netbeans IDE中设置command-lind参数的问题。

另外，正如@BDL指出的那样，你最好创建一个New Project而不是一个java库（或者分别为服务器和客户端创建两个项目）。

聊天服务器客户端输出

1 个答案: