使用PHP exec命令中断java程序的无限循环 - Break infinite loop java program using PHP exec command

我有JDK，我正在尝试执行包含无限循环的Main.java程序，我想破坏java Main.java<input.txt>output.txt命令，如果它进入无限循环，如果不是无限循环，则不会破坏程序。。有解决方案吗？？出现故障

<?php
exec('cmd /k c:/wamp/www/javac Main.java 2>&1', $outputAndErrors, $return_value);
for($i=0 ; $i<sizeof($outputAndErrors) ; $i++)
{
    $output1=htmlspecialchars($outputAndErrors[$i],ENT_QUOTES);
    echo "$output1";    
    $flag=1;
}
if(!$flag)
{
    exec('cmd /k c:/wamp/www/java Main.java < input.txt > output.txt', $outputAndErrors, $return_value);
    //want to give timeout but if exec goes to infinite loop than below statement will not executed
}
?>

试着用这样的类包装它（本质上是用nohup COMMAND > /dev/null 2>&1 & echo $!包装它以获得pid并在后台使用它）

<?php
    // You may use status(), start(), and stop(). notice that start() method gets called automatically one time.
    $process = new Process('ls -al');
    // or if you got the pid, however here only the status() metod will work.
    $process = new Process();
    $process.setPid(my_pid);
?>
<?php
    // Then you can start/stop/ check status of the job.
    $process.stop();
    $process.start();
    if ($process.status()){
        echo "The process is currently running";
    }else{
        echo "The process is not running.";
    }
?>
<?php
/* An easy way to keep in track of external processes.
* Ever wanted to execute a process in php, but you still wanted to have somewhat controll of the process ? Well.. This is a way of doing it.
* @compability: Linux only. (Windows does not work).
* @author: Peec
*/
class Process{
    private $pid;
    private $command;
    public function __construct($cl=false){
        if ($cl != false){
            $this->command = $cl;
            $this->runCom();
        }
    }
    private function runCom(){
        $command = 'nohup '.$this->command.' > /dev/null 2>&1 & echo $!';
        exec($command ,$op);
        $this->pid = (int)$op[0];
    }
    public function setPid($pid){
        $this->pid = $pid;
    }
    public function getPid(){
        return $this->pid;
    }
    public function status(){
        $command = 'ps -p '.$this->pid;
        exec($command,$op);
        if (!isset($op[1]))return false;
        else return true;
    }
    public function start(){
        if ($this->command != '')$this->runCom();
        else return true;
    }
    public function stop(){
        $command = 'kill '.$this->pid;
        exec($command);
        if ($this->status() == false)return true;
        else return false;
    }
}
?>

这只是一个建议。你的问题会有更好的答案。

在java无穷大循环中，检查其他文本文件中的一些值。它就像

while true {
v = readFile('your_txt_file.txt')
if v == "true" {
    break;
}
//do your stuff   }

如果您可以将your_txt_file.txt值设置为false，而不是true，那么java循环将中断。

您需要在java中打开一个要侦听的端口，然后从php连接并发送一些东西到该端口。

查看@TomaszNurkiewicz在他说的地方的回答

您可能想要创建一个ServerSocket并监听它：

ServerSocket serverSocket = new ServerSocket(4000);
Socket socket = serverSocket.accept();

第二行将被阻塞，直到其他软件连接到您的计算机端口4000。然后您可以从返回的套接字中进行读取。看看这个教程，这实际上是一个非常广泛的主题（线程、协议…）

为了用php打开套接字，您可以使用@sanmi从手册中提供的代码（或接近它的somethign）

<?php
error_reporting(E_ALL);
/* Get the port for the WWW service. */
$service_port = getservbyname('www', 'tcp');
/* Get the IP address for the target host. */
$address = gethostbyname('www.example.com');
/* Create a TCP/IP socket. */
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket === false) {
    echo "socket_create() failed: reason: " . 
         socket_strerror(socket_last_error()) . "'n";
}
echo "Attempting to connect to '$address' on port '$service_port'...";
$result = socket_connect($socket, $address, $service_port);
if ($result === false) {
    echo "socket_connect() failed.'nReason: ($result) " . 
          socket_strerror(socket_last_error($socket)) . "'n";
}
$in = "HEAD / HTTP/1.1'r'n";
$in .= "Host: www.example.com'r'n";
$in .= "Connection: Close'r'n'r'n";
$out = '';
echo "Sending HTTP HEAD request...";
socket_write($socket, $in, strlen($in));
echo "OK.'n";
echo "Reading response:'n'n";
while ($out = socket_read($socket, 2048)) {
    echo $out;
}
socket_close($socket);
?>