Java – drag and drop txt files into textarea

Here I have a text area called sourcetx, where I drag and drop the file, and then use BufferedReader to read the contents of the file From the following code, I can see that I have set up the file and I am using absolutepath to read the content

So when I drag and drop some Txt file, it will work, it will read the content and put it in the text area, but when I also drag and drop some folders, for example, it will also read some content and put it in the text area

So I want to make this drag and drop read-only Txt file? How can I get that?

This is the code of the method:

public void dragDrop(){

       sourceTx.setOnDragOver(new EventHandler <DragEvent>()  {
        @Override
        public void handle(DragEvent event) {

            Dragboard db = event.getDragboard();

            if(db.hasFiles()){
                event.acceptTransferModes(TransferMode.ANY);

                for(File file:db.getFiles()){
                    String absolutePath = file.getAbsolutePath();
                    BufferedReader br = null;
                    try {
                        br = new BufferedReader(new InputStreamReader(new FileInputStream(absolutePath)));

                        String line = null;
                        String text = "";

                        String nl = System.getProperty("line.separator","\n");

                        while((line = br.readLine()) != null)
                            text += line + nl;

                        sourceTx.setText( text.trim() );

                    } catch (Exception e) {
                        Message@R_113_2419@.show(Message@R_113_2419@Type.ERROR,I18n.localize("File Error"),I18n.localize("Error while reading content from selected file"));
                    } finally{
                        if(br != null)
                            try {
                                br.close();
                            } catch (Exception e) {}
                    }

                }

            }else{
                event.setDropCompleted(false);
            }

            event.consume();
        }
    });
}

Solution

Hello, try to read your file recursively

...
for (File file : db.getFiles()) {
    sourceTx.setText(handleFile(file));
}
...
    private String handleFile(File file) {
            String ret = "";
            if (file.isDirectory()) {
                for (File f : file.listFiles()) {
                    ret.concat(handleFile(f));
                }
            } else {
                /*this is your filereader*/
                String absolutePath = file.getAbsolutePath();
                BufferedReader br = null;
                try {
                    br = new BufferedReader(new InputStreamReader(new FileInputStream(absolutePath)));

                    String line = null;
                    String text = "";

                    String nl = System.getProperty("line.separator","\n");

                    while ((line = br.readLine()) != null)
                        text += line + nl;

                    ret.concat(text.trim());

                } catch (Exception e) {
                    Message@R_113_2419@.show(Message@R_113_2419@Type.ERROR,I18n.localize("Error while reading content from selected file"));
                } finally {
                    if (br != null)
                        try {
                            br.close();
                        } catch (Exception e) {
                        }
                }

            }
            return ret;
        }