JavaFX线程问题 [英] JavaFX thread issue

问题描述

我正在使用线程来解决GUI冻结的问题。但是线程我面临一个问题，我无法将报告格式作为run方法中的参数传递，或者甚至在构造函数的帮助下我无法做到.....

i'm using thread to resolve the problem of GUI freeze. But with thread i'm facing a problem that i'm unable to pass format of the report as argument in run method or even with the help of constructor i'm unable to do it.....

public class BirtReportExportCon implements Runnable {

    @FXML
    Button exportButton;

    @FXML
    CheckBox pdfCheckBox;

    @FXML
    CheckBox xlsCheckBox;

    @FXML
    CheckBox docCheckBox;

    @FXML
    CheckBox mailCheckBox;

    public String fileFormat;

允许在Gui上检查单个CheckBox

Allow to Check Single CheckBox on Gui

    public void eventCheckBoxPdf() {
        if (pdfCheckBox.isSelected() == true) {
            xlsCheckBox.setSelected(false);
            docCheckBox.setSelected(false);
        }
    }

    public void eventCheckBoxXls() {
        if (xlsCheckBox.isSelected() == true) {
            pdfCheckBox.setSelected(false);
            docCheckBox.setSelected(false);
        }
    }

    public void eventCheckBoxDoc() {
        if (docCheckBox.isSelected() == true) {
            pdfCheckBox.setSelected(false);
            xlsCheckBox.setSelected(false);
        }
    }

提供选择的fileFormat

Provide the Chosen fileFormat

    public void onButtonClick() throws EngineException {

        if (docCheckBox.isSelected() == true) {
            fileFormat = "docx"; // I WANT THIS FILE FORMAT IN MY RUN METHOD
            Runnable r = new BirtReportExportCon();
            new Thread(r).start();

        }

        else if (pdfCheckBox.isSelected() == true) {
            fileFormat = "pdf";
            Runnable r = new BirtReportExportCon();
            new Thread(r).start();
        }

        else if (xlsCheckBox.isSelected() == true) {
            fileFormat = "xls";
            Runnable r = new BirtReportExportCon();
            new Thread(r).start();
        }
    }

运行方法

    public void run()
    {
        try
        {
            exportFile(fileFormat); // HERE I WANT THAT SO I CAN ABLE TO CREATE REPORT OF REQUIRED FORMAT
        }
        catch (EngineException e) {
            e.printStackTrace();
        }
    }

保存报告并打开报告

    public void exportFile(String fileFormat) throws EngineException {

        String output = "output path";
        String reportDesignFilePath = "report path";


        try {
            EngineConfig configure = new EngineConfig();
            Platform.startup(configure);
            IReportEngineFactory reportEngineFactory = (IReportEngineFactory) Platform
                    .createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
            IReportEngine engine = reportEngineFactory.createReportEngine(configure);
            engine.changeLogLevel(Level.WARNING);
            IReportRunnable runnable = engine.openReportDesign(reportDesignFilePath);
            IRunAndRenderTask task = engine.createRunAndRenderTask(runnable);
            IRenderOption option = new PDFRenderOption();
            option.setOutputFormat(fileFormat);
            option.setOutputFileName(output + fileFormat);
            task.setRenderOption(option);
            task.run();
            task.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // Open Created File
        File fileOpen = new File(output + fileFormat);
        if (fileOpen.exists()) {
            if (Desktop.isDesktopSupported()) {
                try {
                    Desktop desktop = Desktop.getDesktop();
                    desktop.open(fileOpen);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

推荐答案

我有类似的问题。我认为问题出在fileOpening阶段。您正在使用的Desktop类来自java.awt包。当您使用Desktop类时，JAVAFX线程会被用户在此答案底部给出的链接中注释阻止。但是用户声誉很低（只有11），所以我们不能依赖他。

I had a similar problem like this. I think the problem lies in the fileOpening stage. The Desktop class you are using comes from java.awt package.When you use the Desktop class then the JAVAFX thread gets blocked as commented by a user in the link given at the bottom of this answer. But the user has a low reputation (only 11)so we cannot rely on him.

要使应用程序解冻，您必须创建一个新的线程。
这是我的代码的一部分，我在我的应用程序中使用，这段代码完美无缺。我还提供了一个链接到我的应用程序的github问题，其中我说明了冻结问题，类似于你的。该问题是在2天前创建的。

To make your application unfreeze, you will have to create a new Thread. Here is a part of my code, i used in my application and this code worked perfectly. I have also put a link to a github issue of my application where i stated the freezing problem, similar to yours. The issue was created 2 days ago.

@FXML
    void openWithAction(ActionEvent event) {
        boolean flag = false;
        Task task = new Task<Void>() {
            @Override
            protected Void call() throws Exception {
                try {
                    Desktop.getDesktop().open(new File(fileModel.getFileLocation()));
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return null;
            }
        };
        new Thread(task).start();
    }

Github问题链接：
https://github.com/karanpant/SearchEverything/issues/3

Github issue link: https://github.com/karanpant/SearchEverything/issues/3

我还建议你使用JavaFX提供的并发。
这是另一个SO帖子链接。希望这可以帮助。
Desktop.open上的JavaFX Freeze（文件），Desktop.browse（ uri）

I also suggest you to use concurrency provided by JavaFX. Here is the other SO post link. Hope this helps. JavaFX Freeze on Desktop.open(file), Desktop.browse(uri)

编辑：如果我不理解你的问题，我很抱歉。您是关于应用程序冻结的问题，还是由于应用程序冻结导致无法传递参数或无法传递参数的问题。

I am sorry if i don't understand your question . Is your question about application freezing or about not being able to pass a parameter or about not being able to pass a parameter because of application freezing.

这篇关于JavaFX线程问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！