文件选择窗口

创建5个按钮用以开启窗口

Button button = new Button("单选文件窗口");  
Button button1 = new Button("多选文件窗口");  
Button button2 = new Button("打开文本");  
Button button3 = new Button("保存文本");  
Button button4 = new Button("选择文件夹");

创建1个多行文本显示选择的文件信息

TextArea textArea = new TextArea();  
textArea.setPrefWidth(600);  
textArea.setWrapText(true);

按钮点击事件

单选文件按钮

button.setOnAction(new EventHandler<ActionEvent>() {
    @Override  
    public void handle(ActionEvent event) {
        Stage stage = new Stage();
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("单选文件");
        fileChooser.setInitialDirectory(new File(File.separator + "DevelopEnvironment"));
        // 限制选择的文件类型  
        fileChooser.getExtensionFilters().addAll(  
            new FileChooser.ExtensionFilter("可执行文件", "*.exe"),  
            new FileChooser.ExtensionFilter("所有类型", "*.*"));
        File file = fileChooser.showOpenDialog(stage);
        // Optional.ofNullable(file)判空，ifPresent非空执行  
        Optional.ofNullable(file).ifPresent(file1 -> textArea.setText(file1.getAbsolutePath()));
    }
});

多选文件按钮

button1.setOnAction(new EventHandler<ActionEvent>() {
    @Override  
    public void handle(ActionEvent event) {
        Stage stage = new Stage();
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("多选文件");
        fileChooser.setInitialDirectory(new File(File.separator + "DevelopEnvironment"));
        // 限制选择的文件类型  
        fileChooser.getExtensionFilters().addAll(  
            new FileChooser.ExtensionFilter("可执行文件", "*.exe"),  
            new FileChooser.ExtensionFilter("所有类型", "*.*"));
        List<File> files = fileChooser.showOpenMultipleDialog(stage);
        // Optional.ofNullable(file)判空，ifPresent非空执行  
        Optional.ofNullable(files).ifPresent(new Consumer<List<File>>() {
            @Override  
            public void accept(List<File> files) {
                textArea.clear();
                files.forEach(file -> {
                    textArea.appendText(file.getAbsolutePath() + "n");  
                });  
            }  
        });  
    }  
});

打开文本文件并显示文本

button2.setOnAction(new EventHandler<ActionEvent>() {
    @Override  
    public void handle(ActionEvent event) {
        Stage stage = new Stage();
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("打开文本");
        fileChooser.setInitialDirectory(new File("C:" + File.separator + "Users" + File.separator + "86158" + File.separator + "桌面"));
        // 限制选择的文件类型  
        fileChooser.getExtensionFilters().addAll(  
            new FileChooser.ExtensionFilter("文本文件", "*.txt"));
        File file = fileChooser.showOpenDialog(stage);
        // Optional.ofNullable(file)判空，ifPresent非空执行  
        Optional.ofNullable(file).ifPresent(file1 -> {
            try (  
                FileInputStream fileInputStream = new FileInputStream(file1);
                InputStreamReader reader = new InputStreamReader(fileInputStream, StandardCharsets.UTF_8);
                // FileReader reader = new FileReader(file1);  
                BufferedReader br = new BufferedReader(reader);
            ) {
                String str = null;
                while ((str = br.readLine()) != null) {
                    textArea.appendText(str + "n");  
                }  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        });  
    }  
});

保存文本到文件

button3.setOnAction(new EventHandler<ActionEvent>() {
    @Override  
    public void handle(ActionEvent event) {
        Stage stage = new Stage();
        FileChooser fileChooser = new FileChooser();
        fileChooser.setTitle("保存文本");
        fileChooser.setInitialFileName("鸡汤-改");
        fileChooser.setInitialDirectory(new File("C:" + File.separator + "Users" + File.separator + "86158" + File.separator + "桌面"));
        // 限制选择的文件类型  
        fileChooser.getExtensionFilters().addAll(  
            new FileChooser.ExtensionFilter("可执行文件", "*.txt"),  
            new FileChooser.ExtensionFilter("所有类型", "*.*"));
        File file = fileChooser.showSaveDialog(stage);
        // Optional.ofNullable(file)判空，ifPresent非空执行  
        Optional.ofNullable(file).ifPresent(file1 -> {
            System.out.println("file1.getAbsolutePath() = " + file1.getAbsolutePath());
            try (  
                FileOutputStream fileOutputStream = new FileOutputStream(file1);
                OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream);
            ) {
                outputStreamWriter.write(textArea.getText());
            }
            catch (IOException e) {
                e.printStackTrace();
            }
        });
    }
});

选择文件夹

button4.setOnAction(new EventHandler<ActionEvent>() {
    @Override  
    public void handle(ActionEvent event) {
        Stage stage = new Stage();
        DirectoryChooser directoryChooser = new DirectoryChooser();
        directoryChooser.setTitle("文件夹选择器");
        directoryChooser.setInitialDirectory(new File(File.separator + "DevelopEnvironment"));
        File file = directoryChooser.showDialog(stage);
        Optional.ofNullable(file).ifPresent(file1 -> {
            textArea.clear();
            File[] files = file1.listFiles();
            for (File file2 : files) {
                textArea.appendText(file2.getAbsolutePath() + "n");  
            }  
        });  
    }  
});

# 文件选择窗口

文件选择窗口