Question

在我的应用程序中按下备份按钮时，创建数据库备份需要一些时间，因此我需要显示一个包含＆＃34;请等待的jframe。＆＃34;消息，并希望在备份过程完成时进行处理。以下是我的代码，但它从不显示jframe，但应用程序一直停留，直到进程结束。

try {

            WaitView wait = new WaitView();
            wait.setLocationRelativeTo(null);
            wait.setVisible(true);

            Process p = Runtime.getRuntime().exec("cmd /c mysqlbackup.bat", null, new File("C:\\MySQLBackups"));            
            p.waitFor();

            wait.dispose();

            MessageService.showMessageDialog(MessageService.BACKUP_SUCCESSFUL, "Successful", "info");

        } catch (Exception ex) {
            ex.printStackTrace();
        }

Answer 1

将代码包装在SwingUtilities.invokeLater（）

中

        Process p = Runtime.getRuntime().exec("cmd /c mysqlbackup.bat", null, new File("C:\\MySQLBackups"));            
        p.waitFor();

        wait.dispose();

        MessageService.showMessageDialog(MessageService.BACKUP_SUCCESSFUL, "Successful", "info");

但实际上最好在单独的线程中运行succh任务。检查SwingWorker示例。

Answer 2

好吧，正如StanislavL上面指示的那样，我修改了下面的代码，And It Worked！

        final WaitView wait = new WaitView();
        wait.setLocationRelativeTo(null);
        wait.setVisible(true);

        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                try {
                    Process p = Runtime.getRuntime().exec("cmd /c mysqlbackup.bat", null, new File("C:\\MySQLBackups"));
                    p.waitFor();

                    wait.dispose();

                    MessageService.showMessageDialog(MessageService.BACKUP_SUCCESSFUL, "Successful", "info");
                } catch (InterruptedException ex) {
                    Logger.getLogger(HomeView.class.getName()).log(Level.SEVERE, null, ex);
                } catch (IOException ex) {
                    Logger.getLogger(HomeView.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        });

等待另一个进程结束时显示JFrame

2 个答案: