JavaFX FileChooser文件选择器，缓存上一次打开的目录
作者：互联网
例1：点击按钮Choose File打开文件选择器，并打开指定的目录。这是通过final void setInitialDirectory(final File value)方法实现的。
1 import java.io.File;
2
3 import javafx.application.Application;
4 import javafx.event.ActionEvent;
5 import javafx.event.EventHandler;
6 import javafx.geometry.Insets;
7 import javafx.geometry.Pos;
8 import javafx.scene.Scene;
9 import javafx.scene.control.Button;
10 import javafx.scene.layout.GridPane;
11 import javafx.stage.FileChooser;
12 import javafx.stage.FileChooser.ExtensionFilter;
13 import javafx.stage.Stage;
14
15 public class Main extends Application {
16
17 public static void main(String[] args) {
18 launch(args);
19 }
20
21 @Override
22 public void start(Stage primaryStage) throws Exception {
23 // Create a pane to hold a button
24 GridPane pane = new GridPane();
25 pane.setStyle("-fx-border-color: green;");
26 pane.setAlignment(Pos.CENTER);
27 pane.setPadding(new Insets(10, 10, 10, 10));
28 pane.setHgap(10);
29 pane.setVgap(10);
30
31 // Create a button to choose a file
32 Button btChooseFile = new Button("Choose File");
33 pane.add(btChooseFile, 0, 0);
34
35 // Set the primary stage properties
36 primaryStage.setScene(new Scene(pane, 400, 200));
37 primaryStage.setTitle("Starting...");
38 primaryStage.setResizable(false);
39 primaryStage.show();
40
41 //
42 btChooseFile.setOnAction(new EventHandler<ActionEvent>() {
43 @Override
44 public void handle(ActionEvent event) {
45 FileChooser fileChooser = new FileChooser();
46 fileChooser.setTitle("Choose File");
47 fileChooser.setInitialDirectory(new File("J:" + File.separator + "PrtSc" + File.separator + "20190321"));
48 fileChooser.getExtensionFilters().addAll(new ExtensionFilter("Text Files", "*.txt"), new ExtensionFilter("All Files", "*.*"));
49 File file = fileChooser.showOpenDialog(primaryStage);
50 if (file != null) {
51 System.out.println(file.getAbsolutePath());
52 }
53 }
54 });
55 }
56 }
UI：
例2：增加一个缓存文件，用于记录上一次选中的目录。
工程结构：
1 import java.io.File;
2 import java.io.FileInputStream;
3 import java.io.FileNotFoundException;
4 import java.io.FileOutputStream;
5 import java.io.IOException;
6 import java.io.InputStream;
7 import java.io.OutputStream;
8
9 import javafx.application.Application;
10 import javafx.event.ActionEvent;
11 import javafx.event.EventHandler;
12 import javafx.geometry.Insets;
13 import javafx.geometry.Pos;
14 import javafx.scene.Scene;
15 import javafx.scene.control.Button;
16 import javafx.scene.layout.GridPane;
17 import javafx.stage.FileChooser;
18 import javafx.stage.FileChooser.ExtensionFilter;
19 import javafx.stage.Stage;
20
21 public class Main extends Application {
22
23 public static void main(String[] args) {
24 launch(args);
25 }
26
27 @Override
28 public void start(Stage primaryStage) throws Exception {
29 // Create a pane to hold a button
30 GridPane pane = new GridPane();
31 pane.setStyle("-fx-border-color: green;");
32 pane.setAlignment(Pos.CENTER);
33 pane.setPadding(new Insets(10, 10, 10, 10));
34 pane.setHgap(10);
35 pane.setVgap(10);
36
37 // Create a button to choose a file
38 Button btChooseFile = new Button("Choose File");
39 pane.add(btChooseFile, 0, 0);
40
41 // Set the primary stage properties
42 primaryStage.setScene(new Scene(pane, 400, 200));
43 primaryStage.setTitle("Starting...");
44 primaryStage.setResizable(false);
45 primaryStage.show();
46
47 //
48 btChooseFile.setOnAction(new EventHandler<ActionEvent>() {
49 @Override
50 public void handle(ActionEvent event) {
51 FileChooser fileChooser = new FileChooser();
52 fileChooser.setTitle("Choose File");
53 fileChooser.getExtensionFilters().addAll(new ExtensionFilter("All Files", "*.*"));
54 //
55 File cache = new File("cache.txt");
56 if (cache.exists()) {
57 try (InputStream inputStream = new FileInputStream(cache)) {
58 // int length = (int) cache.length();
59 // byte[] bytes = new byte[length];
60 byte[] bytes = new byte[(int) cache.length()];
61 // Read the contents of the cache.txt
62 inputStream.read(bytes);
63 //
64 File directory = new File(new String(bytes));
65 if (directory.exists()) {
66 fileChooser.setInitialDirectory(directory);
67 }
68 } catch (FileNotFoundException e) {
69 e.printStackTrace();
70 } catch (IOException e1) {
71 e1.printStackTrace();
72 }
73 }
74 //
75 File file = fileChooser.showOpenDialog(primaryStage);
76 if (file != null) {
77 // Store the directory to the cache.txt
78 try (OutputStream outputStream = new FileOutputStream(cache)) {
79 byte[] bytes = file.getParent().getBytes();
80 int length = file.getParent().getBytes().length;
81 outputStream.write(bytes, 0, length);
82 // outputStream.write(file.getParent().getBytes(), 0, file.getParent().getBytes().length);
83 } catch (FileNotFoundException e) {
84 e.printStackTrace();
85 } catch (IOException e) {
86 e.printStackTrace();
87 }
88 }
89 }
90 });
91 }
92 }
标签：10,pane,JavaFX,javafx,FileChooser,new,import,File,选择器 来源： https://www.cnblogs.com/Satu/p/10847649.html