如何使用Java在Windows中运行的进程的PID

Question

我已经使用了可用的OSHI库，但是getProcessID函数不起作用。我需要找到用户输入的进程的PID。

Answer 1

我不知道OSHI库，但您可以使用下面的方法来获取PID。

阅读代码中的注释：

/**
 * ** FOR WINDOWS ONLY **<br><br>
 * <p>
 * Retrieves the PID value(s) for all instances of the supplied process that
 * is running and returns them within a comma (,) delimited String.<br><br>
 * <p>
 * Note: Some applications like MS WORD (winword.exe) for example will not
 * report multiple instances of itself. This is because when you open
 * another MS WORD what you are really doing is simply opening another MAIN
 * WINDOW of MS WORD which is an integral part of the initial MS WORD opened
 * first, it's not another process. So, in other words, if MS WORD is
 * already running and you start another instance of it what happens is that
 * the application first looks to see if it is already running and if it is
 * then it just opens another Main Window giving the impression that it is
 * another process. If MS WORD is not running already then a new process is
 * started. Many different types of applications can do this sort of
 * thing.<br><br>
 *
 * @param processName      (String) Supply the executable name, for example:
 *                         "winword.exe". Will work also if only "winword" or 
 *                         "Notepad" is supplied (as examples).<br>
 *
 * @param ignoreLetterCase (Optional - Boolean - Default is true) If set to
 *                         true the this method will ignore letter Case when
 *                         trying to located the desired process.<br>
 *
 * @return (String) The PID as String for the supplied application or process 
 * name. If there is more than one instance of the application or process then 
 * a comma delimited string string will be returned consisting of a PID for each 
 * instance. It will be up to you to determine which PID belongs to which instance.
 */
public static String getProcessPID(String processName, boolean... ignoreLetterCase) {
    String pid = "";
    boolean ignoreCase = true;
    if (ignoreLetterCase.length > 0) {
        ignoreCase = ignoreLetterCase[0];
    }

    // Acquire the Task List from Windows
    ProcessBuilder processBuilder = new ProcessBuilder("tasklist.exe");
    Process process;
    try {
        process = processBuilder.start();
    }
    catch (java.io.IOException ex) {
        return "";
    }
    // Read the list and grab the desired PID
    String tasksList;
    try (Scanner scanner = new Scanner(process.getInputStream(), "UTF-8").useDelimiter("\\A")) {
        int counter = 0;
        String strg = "";
        while (scanner.hasNextLine()) {
            strg = scanner.nextLine();
            
            // Uncomment the line below to print the current Tasks List to Console Window.
            // System.out.println(strg); 
            
            if (!strg.isEmpty()) {
                counter++;
                if (counter > 2) {
                    if (ignoreCase) {
                        if (strg.toLowerCase().contains(processName.toLowerCase())) {
                            String[] tmpSplit = strg.split("\\s+");
                            pid += (pid.isEmpty()) ? tmpSplit[1] : ", " + tmpSplit[1];
                        }
                    }
                    else {
                        if (strg.contains(processName)) {
                            String[] tmpSplit = strg.split("\\s+");
                            pid += (pid.isEmpty()) ? tmpSplit[1] : ", " + tmpSplit[1];
                        }
                    }
                }
            }
        }
    }
    return pid;
}