无法得到来自PHP套接字服务器的响应

Question

我制作了简单的套接字java客户端和基于php cli的套接字echo服务器。
但客户端不会从服务器获取回显。
theres一个代码...

[CLIENT_CLASS（JAVA）]

import java.net.*; 
import java.io.*; 
import java.util.logging.Level; 
import java.util.logging.Logger; 

public class SocketManager 
{ 

    public static void main(String args[]) 
    { 
     int count = 0; 
     Socket socket = null; 
     System.out.println("[TO 8175] Connecting to " + "clashofages.ru" + ":" + 8175 + "..."); 
     while (socket == null) { 
      if (count > 10) { 
       System.out.println("[TO 8175] Can't connect to server..."); 
       return 1; 
      } 
      socket = connect("clashofages.ru", 8175); 
      count++; 
     } 
     System.out.println("[TO 8175] Successfuly connected!"); 

     DataInputStream in = getInput(socket); 
     if (in == null) { 
      return 2; 
     } 
     DataOutputStream out = getOutput(socket); 
     if (out == null) { 
      return 3; 
     } 

     BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in)); 
     String line = null; 

     while (true) { 
      System.out.println("[TO 8175] Type in message for server."); 
      try { 
       line = keyboard.readLine(); 
      } catch (IOException ex) { 
       Logger.getLogger(SocketManager.class.getName()).log(Level.SEVERE, null, ex); 
      } 
      System.out.println("[TO 8175] Sending message to server..."); 
      int writeres = write(out, line); 
      if (writeres != 2) { 
       return 4 + writeres; 
      } 
      System.out.println("[TO 8175] Message sent successfuly!"); 
      if (line.equals("exit")) { 
       System.out.println("[TO 8175] Exiting..."); 
       return 0; 
      } 
      line = read(in); 
      if (line == null) { 
       return 6; 
      } 
      System.out.println("[TO 8175] Server: " + line); 
     } 
    } 

    public static Socket connect(String adress, int port) 
    { 
     Socket socket = null; 
     InetAddress ipAddress = null; 
     try { 
      ipAddress = InetAddress.getByName(adress); 
     } catch (UnknownHostException ex) { 
      System.out.println("[SOCKET_ERROR] Can't convert " + adress + " to InetAdress object"); 
      return socket; 
     } 
     try { 
      socket = new Socket(ipAddress, port); 
     } catch (IOException ex) { 
      System.out.println("[SOCKET_ERROR] Can't connect to " + adress + ":" + port); 
      return null; 
     } 
     return socket; 
    } 

    public static DataInputStream getInput(Socket socket) 
    { 
     InputStream sin = null; 
     try { 
      sin = socket.getInputStream(); 
     } catch (IOException ex) { 
      System.out.println("[SOCKET_ERROR] Can't get socket's input stream"); 
      return null; 
     } 
     return new DataInputStream(sin); 
    } 

    public static DataOutputStream getOutput(Socket socket) 
    { 
     OutputStream sout = null; 
     try { 
      sout = socket.getOutputStream(); 
     } catch (IOException ex) { 
      System.out.println("[SOCKET_ERROR] Can't get socket's output stream"); 
      return null; 
     } 
     return new DataOutputStream(sout); 
    } 

    public static int write(DataOutputStream out, String string) 
    { 
     try { 
      out.writeUTF(string); 
     } catch (IOException ex) { 
      System.out.println("[SOCKET_ERROR] Can't write to output stream"); 
      return 0; 
     } 
     try { 
      out.flush(); 
     } catch (IOException ex) { 
      System.out.println("[SOCKET_ERROR] Can't flush output stream"); 
      return 1; 
     } 
     return 2; 
    } 

    public static String read(DataInputStream in) 
    { 
     try { 
      return in.readUTF(); 
     } catch (IOException ex) { 
      System.out.println("[SOCKET_ERROR] Can't read input stream"); 
      return null; 
     } 
    } 

[SERVER_CLI_CLASS（PHP）]

#!/usr/bin/php 
<?php 
error_reporting(E_ALL); 
set_time_limit(0); 
ob_implicit_flush(); 

$address = '0.0.0.0'; 
$port = 8175; 

if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) { 
    echo "[SERVER] socket_create() failed: ".socket_strerror(socket_last_error())."\n"; 
} 
if (socket_bind($sock, $address, $port) === false) { 
    echo "[SERVER] socket_bind() failed: ".socket_strerror(socket_last_error($sock))."\n"; 
} 
if (socket_listen($sock, 5) === false) { 
    echo "[SERVER] socket_listen() failed: ".socket_strerror(socket_last_error($sock))."\n"; 
} 
echo "[SERVER] Start listening ".$address.":".$port."\n"; 
do { 
    if (($msgsock = socket_accept($sock)) === false) { 
     echo "[SERVER] socket_accept() failed: reason: ".socket_strerror(socket_last_error($sock))."\n"; 
     break; 
    } 
    echo "[SERVER] Client connected!\n"; 
    $msg = "[SERVER] Welcome!\n"; 
    socket_write($msgsock, $msg, strlen($msg)); 

    do { 
     if (false === ($buf = socket_read($msgsock, 2048, PHP_NORMAL_READ))) { 
      echo "[SERVER] socket_read() failed: ".socket_strerror(socket_last_error($msgsock))."\n"; 
      break 2; 
     } 
     if (!$buf = trim($buf)) { 
      continue; 
     } 
     if ($buf == 'quit') { 
      break; 
     } 
     $talkback = "[SERVER] You said '$buf'.\n"; 
     socket_write($msgsock, $talkback, strlen($talkback)); 
     echo "[CLIENT] $buf\n"; 
    } while (true); 
    socket_close($msgsock); 
} while (true); 

socket_close($sock); 
?> 

服务器输出：

[SERVER] Start listening 0.0.0.0:8175 
[SERVER] Client connected! 

客户端输出：

[TO 8175] Connecting to clashofages.ru:8175... 
[TO 8175] Successfuly connected! 
[TO 8175] Type in message for server. 
Hi! 
[TO 8175] Sending message to server... 
[TO 8175] Message sent successfuly! 

任何想法，兄弟？

P.S.我认为当PHP尝试写入客户端时发生问题...
P.P.S.你可以自己尝试。服务器在http://www.php.net/manual/en/function.socket-read.php现在的工作..

Answer 1

Readed：

PHP_NORMAL_READ - 读停在\ n或\ r。

Readed在http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#readLine()：

返回：包含该行的内容的字符串，不包括 任何行终止符或null如果该流的末尾， 已经达到

因此，您必须在发送字符串之前将\ n或\ n添加到缓存的字符串中。