java - Java 套接字侦听器问题？

Question

我已经坚持了一段时间了。我正在尝试使用 PHP 将数据发送到 Java 服务器。当我在 Bukkit 中加载插件时，当我调用此函数时它会停止加载：

public void SocketListen()
{       

    String clientSentence;
    String capitalizedSentence;

    try
    {

        ServerSocket welcomeSocket = new ServerSocket(25566);

        while(true)
        {
           Socket connectionSocket = welcomeSocket.accept();
           BufferedReader inFromClient =
              new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
           DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
           clientSentence = inFromClient.readLine();
           System.out.println("Received: " + clientSentence);
           capitalizedSentence = clientSentence.toUpperCase() + '\n';
           outToClient.writeBytes(capitalizedSentence);
        }
    }
    catch(IOException e)
    {
        getLogger().severe(e.toString());
    }

}

这告诉我我做错了什么。我的PHP是：

<?php
$host = "localhost"; 
$port = 25566;
$data = 'test\n';

if ( ($socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === FALSE )
    echo "socket_create() failed: reason: " . socket_strerror(socket_last_error());
else 
{
    echo "Attempting to connect to '$host' on port '$port'...<br>";
    if ( ($result = socket_connect($socket, $host, $port)) === FALSE )
        echo "socket_connect() failed. Reason: ($result) " . socket_strerror(socket_last_error($socket));
    else {
        echo "Sending data...<br>";
        socket_write($socket, $data, strlen($data));
        echo "OK<br>";

        echo "Reading response:<br>";
        while ($out = socket_read($socket, 2048)) {
            echo $out;
        }
    }
    socket_close($socket);      
}
?>

我究竟做错了什么？

基本上，我只需要 PHP 服务器发送“Hello”然后 Java 客户端用 getLogger().info(data);

另外，我需要在客户端或服务器上使用 PHP 端口转发 25566 吗？它们都托管在我的本地网络上，具有相同的外部 IP。

Answer 1

这可能是因为循环永远不会停止：

 while(true)
    {
      //code

你可以使用我为java服务器和客户端制作的类：

聊天客户端

    package com.weebly.foxgenesis.src;
import java.net.*;
import java.io.*;

public final class ChatClient
{  
    private Socket socket = null;
    private DataOutputStream streamOut = null;
    private ChatClientThread client = null;
    private String serverName = "localhost";
    private int serverPort = -1;
    private final ChatReciever output;

/**
 * Create a new ChatClient that connects to a given server and receives UTF-8 encoded messages
 * @param a Client class
 */
public ChatClient(ChatReciever chatReciever)
{ 
    output = chatReciever;
    serverPort = chatReciever.getPort();
    serverName = chatReciever.getHost();
    connect(serverName, serverPort);
}

private void connect(String serverName, int serverPort)
{  
    output.handleLog("Establishing connection. Please wait ...");
    try
    {  
        socket = new Socket(serverName, serverPort);
        output.handle("Connected to chat server");
        open();
    }
    catch(UnknownHostException uhe)
    {  
        output.handleError("Host unknown: " + uhe.getMessage()); 
    }
    catch(IOException ioe)
    {  
        output.handleError("Unexpected exception: " + ioe.getMessage()); 
    } 
}

/**
 * Sends a message to the server through bytes in UTF-8 encoding 
 * @param msg message to send to the server
 */
public void send(String msg) throws IOException
{  
    streamOut.writeUTF(msg); 
    streamOut.flush();
}

/**
 * forces the ChatReciever to listen to a message (NOTE: this does not send anything to the server)
 * @param msg message to send
 */
public void handle(String msg)
{  
    output.handle(msg);
}

private void open() throws IOException
{   
    streamOut = new DataOutputStream(socket.getOutputStream());
    client = new ChatClientThread(this, socket); 
}

/**
 * tries to close 
 */
public void close() throws IOException
{  
    if (streamOut != null)  
        streamOut.close();
    if (socket    != null)  
        socket.close(); 
}

/**
 * closes the client connection
 */
@SuppressWarnings("deprecation")
public void stop()
{
    if(client != null)
        client.stop();
    client = null;
}

/**
 * checks if the ChatClient is currently connected to the server
 * @return Boolean is connected
 */
public boolean isConnected()
{
    return client == null ?(false) : (true);
}
}

聊天服务器线程

   package com.weebly.foxgenesis.src;



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

public final class ChatClientThread extends Thread
{  
    private Socket           socket   = null;
    private ChatClient       client   = null;
    private DataInputStream  streamIn = null;

    public ChatClientThread(ChatClient _client, Socket _socket)
    {  
        client   = _client;
        socket   = _socket;
        open();  
        start();
    }
    public void open()
    {  
        try
        {  
            streamIn  = new DataInputStream(socket.getInputStream());
        }
        catch(IOException ioe)
        {  
            System.out.println("Error getting input stream: " + ioe);
            client.stop();
        }
    }
    public void close()
    {  
        try
        {  
            if (streamIn != null) streamIn.close();
        }
        catch(IOException ioe)
        {  
            System.out.println("Error closing input stream: " + ioe);
        }
    }
    public void run()
    {  
        while (true)
        {  
            try
            {  
                client.handle(streamIn.readUTF());
            }
            catch(IOException ioe)
            { 
                System.out.println("Listening error: " + ioe.getMessage());
                client.stop();
            }
        }
    }
}

聊天接收者

 package com.weebly.foxgenesis.src;

public interface ChatReciever 
{
    /**
     * gets the IP address of the host
     * @return String IP address
     */
    public String getHost();

    /**
     * gets the port of the host
     * @return Integer port of host
     */
    public int getPort();

    /**
     * sends a message from the server to the implementing class
     * @param msg message from the server
     */
    public void handle(String msg);

    /**
     * sends an error to the implementing class
     * @param errorMsg error message
     */
    public void handleError(String errorMsg);

    /**
     * Sends a message to the log
     * @param msg message to send
     */
    public void handleLog(Object msg);
}