我有一个套接字在PHP中侦听某个端口,我试图在Java中使用套接字发送一个字符串,但是我一直收到以下错误:
Warning: socket_recv(): unable to read from socket [0]: The operation completed successfully.
in H:\Dropbox\EISTI\www\java-instagram-web\src\Client\Component\Server\Client.php on line 55
没有更多描述,很难理解问题是什么。
我的PHP类如下所示:
class Client {
private $address;
private $port;
private $command;
public function __construct($port, $address, $addressServer, $portServer, $command)
{
set_time_limit(0);
$this->address = $address;
$this->port = $port;
$this->init();
}
private function init(){
//Create socket
if (! $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) {
$this->showError('socket create');
}
echo "Server Created\n";
//Bind socket
if (!socket_bind($socket, $this->address, $this->port)) {
$this->showError('socket bind');
}
echo "Server bind to $this->address and $this->port \n";
if (!socket_listen($socket)) {
$this->showError('socket listen');
}
echo "Server Listening \n";
do {
$client = socket_accept($socket);
echo "connection established\n";
$message = "\n Hey! welcome to the server\n";
socket_write($client, $message, strlen($message));
do {
if (! socket_recv($socket, $clientMessage, 2045, MSG_WAITALL)) {
$this->showError('socket receive');
}
$message = "Command Received\n";
echo $clientMessage;
socket_send($client, $message, strlen($message), 0);
if (!$clientMessage = trim($clientMessage)) {
continue;
}
if (trim($clientMessage) == 'close') {
socket_close($client);
echo "\n\n--------------------------------------------\n".
"ClientRequest terminated\n";
break 1;
}
} while(true);
} while(true);
}
private function showError($message) {
echo ("Error: ".$message);
exit(666);
}
}
我的Java套接字类如下所示:
public class ResponseToClient {
private String host;
private int port;
private Socket socket;
private PrintStream theOut;
private String resultLocation;
/**
* Constructor
*/
public ResponseToClient(String path) {
this.host = "localhost";
this.port = 1000;
this.resultLocation = path;
}
/**
* Setting up Socket
*/
public void init(){
try{
socket = new Socket(host, port);
theOut = new PrintStream(socket.getOutputStream());
//Send Command
sendCommand();
//Closing connections
socket.close();
theOut.close();
}
catch (IOException e){
e.printStackTrace();
}
}
/**
* Send Command
*/
public void sendCommand()
{
theOut.println(Messages.type_response + Messages.seperator_client + resultLocation);
System.out.println(Messages.type_response + Messages.seperator_client + resultLocation);
}
}
我做错了什么?
答案 0 :(得分:1)
我认为问题是你试图从PHP端的服务器套接字而不是客户端套接字读取:
socket_recv($socket, $clientMessage, 2045, MSG_WAITALL)
这应该是
socket_recv($client, $clientMessage, 2045, MSG_WAITALL)
答案 1 :(得分:1)
我发现了问题。
有两个问题,我是从错误的套接字读取,所以我按照@RealSkeptic的建议进行了更改,改为:
socket_recv($socket, $clientMessage, 2045, MSG_WAITALL)
要
socket_recv($client, $clientMessage, 2045, MSG_WAITALL)
另一个问题是我正在使用的内部while循环是对socket_read进行整合。
我是这样做的,因为我从PHP找到的server_sockets教程中得到了这段代码。
但由于沟通的流程,它在这里造成了一个问题:
答案:
在Java方面,我只发送一个响应,而在PHP方面,我在while循环中“无限地”使用socket_read,直到我收到字符串“close”。这就产生了问题,因为在收到第一个响应之后,没有其他内容可供阅读。因此错误。
所以为了解决这个问题,我只需要删除while循环,(为了我的目的,我删除了socket_write,我不需要发送任何信息)。
班级Client
的工作示例:
class Client {
private $addressServer;
private $portServer;
private $address;
private $port;
private $command;
public function __construct($port, $address, $addressServer, $portServer, $command)
{
set_time_limit(0);
$this->addressServer = $addressServer;
$this->address = $address;
$this->portServer = $portServer;
$this->port = $port;
$this->command = $command;
$this->init();
}
private function init() {
//Send request to the Java server
$request = new Request(
$this->addressServer, $this->portServer, $this->command
);
//create socket
if (! $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) {
$this->showError('socket create');
}
echo "Server Created\n";
//Bind socket
if (!socket_bind($socket, $this->address, $this->port)) {
$this->showError('socket bind');
}
echo "Server bind to $this->address and $this->port \n";
if (!socket_listen($socket)) {
$this->showError('socket listen');
}
echo "Server Listening \n";
do {
$client = socket_accept($socket);
echo "connection established\n";
if(!$clientMessage = socket_read($client, 10000, PHP_NORMAL_READ)){
$this->showError('socket read');
}
echo "Command Received\n";
echo $clientMessage;
} while(true);
}
private function showError($message){
echo ("Error: ".$message);
exit(666);
}
}