JavaFX TextArea立即更新 [英] JavaFX TextArea Update Immediately

问题描述

我正在使用Java FX textarea，并使用它来提供有关正在进行的步骤的信息.

I am using Java FX textarea and using it as to provide information for the steps going on.

步骤如下. 复制文件. 删除旧文件. 复制新文件. 然后将一些属性从旧文件复制到新文件.

Steps are as follows. Copy a file. Delete old file. Copy New File. and then copy some properties from old to new file.

整个步骤从单击按钮开始.

This whole step starts when a button is clicked.

我面临的问题是，一旦使用附加命令，文本区域就不会被更新.

The problem I am facing is that text area is not being updated as soon as I use the append command.

append命令添加数据，当函数终止时，我将所有文本放在一起. 我希望在调用函数时更新文本区域.

The append command adds data and when the function terminates, I get all the text together. I want the text area to be updated as I call the function.

在我的程序中，复制文件操作需要一些时间，因为它是一个大文件. 因此，在开始时我会显示该操作已开始的消息. 在操作结束时，我要显示的操作已结束.

In my program, the copy file operation, takes some time as it is a big file. So in the start I display message that the operation has started. and at the end of operation I want to display the operation has ended.

但是文本区域会同时显示所有这些文本.

But the text area displays all these texts all together.

我在oracle论坛中读到，FX中的文本区域使用单个线程，因此在整个过程完成之前不会显示任何内容.

I read in oracle forum, that text area in FX uses a single thread hence wont display anything until the whole process is complete.

文章: https://community.oracle.com/message/9938117#9938117

谁能建议我该怎么办??

Can any one suggest what should I do.?

新编辑

在按钮上单击确定，我正在调用一个函数，该函数将执行以下方法.

Okay on Button Click I am calling a function which executes the following methods.

  public void executeCmds(){

        createTempDirectory();
        copyConfigPropetiesFileValues();
        copyConfigProperties();
        copyYMLFile();
        copyYMLFileProperties();

        stopTomcatServer();

        deleteOldWar();
        copyNewWar();
        startTomcatServer();

        copyOldConfigFile();
        copyOldYMLFile();
 }

现在，每个功能都是一个过程，应按顺序执行.并且在完成每个步骤之后，我想用一个成功的消息来更新GUI文本区域，该消息已完成.

Now Each of the function is a process, which should be executed sequentially. And after each step is completed I want to update the GUI text area with a success message that this is complete.

对于我正在使用的方法如下:

For the I am using method as follows:

  public void createTempDirectory(){
         //Creating temporary directory for copying property files
         status_text_area.appendText("Trying to create a temp directory \n");
        File tempDir= new       File(tomcat_path.getText()+filePath.path_to_temp_directory);
         if(!tempDir.exists())
             tempDir.mkdirs();

    status_text_area.appendText("Created Temp directory to copy Config Files \n");

}

，与其他功能相同. copyWar文件功能和delete warfile功能需要一段时间，因为它将130 MB文件从一个位置复制到另一个位置.

and same is with other functions. The copyWar file function and delete warfile function take time as it copies 130 MB file from a location to other.

所以我希望将文本区域显示为 1.开始复制文件 一段时间后

So I want the textarea to be displayed as, 1. Started copying file and after some time

1. 已复制文件.

但是问题是，在执行所有功能之前，文本区域根本不会填充.

But the issue is , the text area does not populate at all, until all the functions are executed.

如果我尝试通过线程执行这些操作，则执行顺序不予保证. 请帮助

If I try to execute these via threads, then the order of execution is not guranteed. Please Help

推荐答案

在后台线程中运行executeCmds()方法，并使用Platform.runLater()更新文本区域:

Run your executeCmds() method in a background thread and update the text area using Platform.runLater():

public void executeCmds(){
    Thread thread = new Thread(() -> {
        createTempDirectory();
        copyConfigPropetiesFileValues();
        copyConfigProperties();
        copyYMLFile();
        copyYMLFileProperties();

        stopTomcatServer();

        deleteOldWar();
        copyNewWar();
        startTomcatServer();

        copyOldConfigFile();
        copyOldYMLFile();
    });
    thread.start();
}

然后

public void createTempDirectory(){
         //Creating temporary directory for copying property files
    updateStatus("Trying to create a temp directory \n");
    File tempDir= new File(tomcat_path.getText()+filePath.path_to_temp_directory);
    if(!tempDir.exists())
        tempDir.mkdirs();

    updateStatus("Created Temp directory to copy Config Files \n");
}

// similarly for other methods

private void updateStatus(String message) {
    if (Platform.isFxApplicationThread()) {
        status_text_area.appendText(message);
    } else {
        Platform.runLater(() -> status_text_area.appendText(message));
    }
}

这篇关于JavaFX TextArea立即更新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！