java - 在 Java 中执行进程而不卡住 JFrame

Question

如何在 Java 中执行进程而不导致程序卡住？我尝试过使用 SwingWorker，但我还不太明白它是如何工作的。

还有其他方法可以实现此目的吗？我想在我的 JDroidLib 中使用类似的东西。如需完整源代码，请查看 GitHub:http://github.com/Team-M4gkBeatz/JDroidLib

提前致谢!

编辑:

感谢您的回答。但我有一个包含多种方法的类(嗯，它不止一个类，但你明白我的意思)；我如何使用 SwingWorker 与它们交互？

这是其中一类:

/**
 *
 * @author Simon
 */
    public abstract class Command extends SwingWorker {

    BufferedReader prReader = null;
    ProcessBuilder process = null;
    Process pr = null;
    Date timeNow = new Date();
    String osName = System.getProperty("os.name");

    public void executeProcessNoReturn(String _process, String arg) throws IOException {
        process = new ProcessBuilder(_process, arg);
        pr = process.start();
    }

     public String executeProcessReturnLastLine(String _process, String arg) throws IOException {
        process = new ProcessBuilder(_process, arg);
        pr = process.start();
        prReader = new BufferedReader(new InputStreamReader(pr.getInputStream()));
        String line;
        while ((line = prReader.readLine()) != null) {
            // Wait for input to end.
        }
        return line;
    }

    public StringBuilder executeProcessReturnAllOutput(String _process, String arg) throws IOException {
        process = new ProcessBuilder(_process, arg);
        pr = process.start();
        prReader = new BufferedReader(new InputStreamReader(pr.getInputStream()));
        StringBuilder output = null;
        String line;
        while ((line = prReader.readLine()) != null) {
            output.append(line);
        }
        return output;
    }

    public boolean isProcessRunning(String processName) throws IOException {
        boolean value = false;
        if (osName.equals("Linux") | osName.contains("Mac")) {
            process = new ProcessBuilder("ps", "-e");
            pr = process.start();
            String line;
            prReader = new BufferedReader(new InputStreamReader(pr.getInputStream()));
            while ((line = prReader.readLine()) != null) {
                if (line.contains(processName)) { value = true; break; }
            }
        } else {
            String winDir = System.getenv("windir") + "/System32/tasklist.exe";
            process = new ProcessBuilder(winDir);
            pr = process.start();
            String line;
            prReader = new BufferedReader(new InputStreamReader(pr.getInputStream()));
            while ((line = prReader.readLine()) != null) {
            if (line.contains(processName)) { value = true; break; }
            }
        }

        return value;

    }

     public String executeProcessReturnError(String processName, String arg) throws IOException {
        process = new ProcessBuilder(processName, arg);
        process.redirectError();
        pr = process.start();
        prReader = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
        String line;
        String output = "";
        while ((line = prReader.readLine()) != null) {
        output += line + "\n";
        }
        return output;
    }
}

Answer 1

是的，你可以使用 SwingWorker 这个想法是，一个需要花费大量时间在单独的线程(后台线程)中运行的任务然后你不会阻塞你的 gui 并且你的 JFrame 是不会卡住。这是我非常喜欢的完整示例 Swing Worker Example .

基本上作为一个示例，您创建自己的类来扩展 SwingWorker 并覆盖 doInBackground。

注意: 您可以像普通类一样拥有字段。

示例:

class Worker extends SwingWorker<Void, String> {
    private SomeClass businessDelegate;    
    private JLabel label;

    @Override
    protected Void doInBackground() throws Exception {
       //here you make heavy task this is running in another thread not in EDT
        businessDelegate.callSomeService();
        setProgress(30); // this is if you want to use with a progressBar
        businessDelegate.saveToSomeDataBase();
        publish("Processes where saved");
        return null;
    }

    @Override
    protected void process(List<String> chunks){
       //this is executed in EDT you can update a label for example
       label.setText(chunks.toString());
    }

   //add setters for label and businessDelegate    
}

您还了解了 process(..) publish(..) 和 done()。

然后将其放入您的客户端代码中。

SwingWorker<Void,String> myWorker = new Worker();
myWorker.execute();