Java 套接字服务器生成问题

第3步中列出的套接字服务器构建干净（java版本“1.7.0_02”），运行时没有错误，但退出时没有错误，而不是等待接受客户端

更新了缺少arg代码的聊天服务器：

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

public class ChatServer implements Runnable
{  private ServerSocket     server = null;
   private Thread           thread = null;
   private ChatServerThread client = 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);
         start();
      }
      catch(IOException ioe)
      {  System.out.println(ioe); }
   }
   public void run()
   {  while (thread != null)
      {  try
         {  System.out.println("Waiting for a client ...");
            addThread(server.accept());
         }
         catch(IOException ie)
         {  System.out.println("Acceptance Error: " + ie); }
      }
   }
   public void addThread(Socket socket)
   {  System.out.println("Client accepted: " + socket);
      client = new ChatServerThread(this, socket);
      try
      {  client.open();
         client.start();
      }
      catch(IOException ioe)
      {  System.out.println("Error opening thread: " + ioe); }
   }
   public void start() {
   thread = new Thread(this);
   thread.start();
 }
   public void stop()                    { /* no change */ }
   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 ChatServerThread extends Thread
{  private Socket          socket   = null;
   private ChatServer      server   = null;
   private int             ID       = -1;
   private DataInputStream streamIn =  null;

   public ChatServerThread(ChatServer _server, Socket _socket)
   {  server = _server;  socket = _socket;  ID = socket.getPort();
   }
   public void run()
   {  System.out.println("Server Thread " + ID + " running.");
      while (true)
      {  try
         {  System.out.println(streamIn.readUTF());
         }
         catch(IOException ioe) {
            System.out.println(ioe.getMessage());
         }
      }
   }
   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();
   }
}

聊天服务器：

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

public class ChatServer implements Runnable
{  private ServerSocket     server = null;
   private Thread           thread = null;
   private ChatServerThread client = 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);
         start();
      }
      catch(IOException ioe)
      {  System.out.println(ioe); }
   }
   public void run()
   {  while (thread != null)
      {  try
         {  System.out.println("Waiting for a client ...");
            addThread(server.accept());
         }
         catch(IOException ie)
         {  System.out.println("Acceptance Error: " + ie); }
      }
   }
   public void addThread(Socket socket)
   {  System.out.println("Client accepted: " + socket);
      client = new ChatServerThread(this, socket);
      try
      {  client.open();
         client.start();
      }
      catch(IOException ioe)
      {  System.out.println("Error opening thread: " + ioe); }
   }
   public void start() {
   thread = new Thread(this);
   thread.start();
 }
   public void stop()                    { /* no change */ }
   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 ChatServerThread extends Thread
{  private Socket          socket   = null;
   private ChatServer      server   = null;
   private int             ID       = -1;
   private DataInputStream streamIn =  null;

   public ChatServerThread(ChatServer _server, Socket _socket)
   {  server = _server;  socket = _socket;  ID = socket.getPort();
   }
   public void run()
   {  System.out.println("Server Thread " + ID + " running.");
      while (true)
      {  try
         {  System.out.println(streamIn.readUTF());
         }
         catch(IOException ioe) {
            System.out.println(ioe.getMessage());
         }
      }
   }
   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();
   }
}

ChatServerThread:

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

public class ChatServer implements Runnable
{  private ServerSocket     server = null;
   private Thread           thread = null;
   private ChatServerThread client = 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);
         start();
      }
      catch(IOException ioe)
      {  System.out.println(ioe); }
   }
   public void run()
   {  while (thread != null)
      {  try
         {  System.out.println("Waiting for a client ...");
            addThread(server.accept());
         }
         catch(IOException ie)
         {  System.out.println("Acceptance Error: " + ie); }
      }
   }
   public void addThread(Socket socket)
   {  System.out.println("Client accepted: " + socket);
      client = new ChatServerThread(this, socket);
      try
      {  client.open();
         client.start();
      }
      catch(IOException ioe)
      {  System.out.println("Error opening thread: " + ioe); }
   }
   public void start() {
   thread = new Thread(this);
   thread.start();
 }
   public void stop()                    { /* no change */ }
   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 ChatServerThread extends Thread
{  private Socket          socket   = null;
   private ChatServer      server   = null;
   private int             ID       = -1;
   private DataInputStream streamIn =  null;

   public ChatServerThread(ChatServer _server, Socket _socket)
   {  server = _server;  socket = _socket;  ID = socket.getPort();
   }
   public void run()
   {  System.out.println("Server Thread " + ID + " running.");
      while (true)
      {  try
         {  System.out.println(streamIn.readUTF());
         }
         catch(IOException ioe) {
            System.out.println(ioe.getMessage());
         }
      }
   }
   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();
   }
}

---

编辑：用有效解决方案更新我的答案

在您的

ChatServer

类中更改这些方法，使之类似

public void start() {
    thread = new Thread(this);
    thread.start();
}

public void stop() { 
    // You should implement this too
}

public static void main(String args[]) { 
    // Instantiate a CharServer with the listening port 9191
    ChatServer chatServer = new ChatServer(9191);
    // CharServer.start() should not be confused with Thread.start();
    // This calls our custom method up above, which includes a call to
    // Thread(ChatServer).start();
    chatServer.start();

}

其中9191是我编的端口号

执行

CharServer

#main方法将生成以下输出并保持活动状态

Binding to port 9191, please wait  ...
Server started: ServerSocket[addr=0.0.0.0/0.0.0.0,port=0,localport=9191]
Waiting for a client ...
Waiting for a client ...

为了实现功能，还应该实现

stop（）

方法

 {  while (thread != null)

您从未设置线程，因此它将全部为空 你永远不会创建线程

尝试将start（）更改为：

---

干净地生成但不运行

您能详细说明一下吗？是的，没有编译错误，当执行时，它应该生成一个侦听器并等待客户端连接，但它没有，它似乎消失了，没有错误。但引用页面上的第一步确实有效。请尝试在ChatServerThread运行方法中处理IOException，并打印错误。如果客户端关闭套接字，您将有一个无限循环，您不会注意到，因为未处理异常。根据下面的建议答案向ChatServerThread添加了建议。仍然没有收到异常。如前所述更改了start（），结果相同。如何设置线程，使其不总是空的？对不起，这里有一个输入错误，它应该是thread=newthread（这个）；更新了我的answer@Astron我已经用适当的解决方案更新了我的答案。请检查。根据您的解决方案，我意识到示例中不存在args。我将用更正的代码更新问题。