init version

pom.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>JnotePad</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

src/main/java/JnotePad.java

@@ -0,0 +1,197 @@
+import javafx.application.Application;
+import javafx.event.ActionEvent;
+import javafx.event.EventHandler;
+import javafx.geometry.Insets;
+import javafx.scene.Scene;
+import javafx.scene.control.*;
+import javafx.scene.image.Image;
+import javafx.scene.layout.BorderPane;
+import javafx.stage.FileChooser;
+import javafx.stage.Stage;
+
+import java.io.*;
+
+public class JnotePad extends Application {
+    String iconSrc = "img/icon.png";
+
+    // 定义菜单栏
+    MenuBar menuBar;
+    Menu fileMenu;
+    MenuItem newItem, openItem, saveItem, saveAsItem;
+
+    // 定义主界面
+    BorderPane root;
+
+    // 定义多个Tab页
+    TabPane tabPane;
+    int tabIndex = 0;
+
+    // 定义状态栏
+    Label statusLabel;
+
+    @Override
+    public void start(Stage primaryStage) {
+        primaryStage.setTitle("JnotePad");
+
+        // 创建菜单栏并添加菜单项
+        menuBar = new MenuBar();
+        fileMenu = new Menu("文件");
+        newItem = new MenuItem("新建");
+        openItem = new MenuItem("打开");
+        saveItem = new MenuItem("保存");
+        saveAsItem = new MenuItem("另存为");
+        fileMenu.getItems().addAll(newItem, openItem, saveItem, saveAsItem);
+        menuBar.getMenus().add(fileMenu);
+
+        // 为菜单项添加事件处理器
+        newItem.setOnAction(new NewFileEventHandler());
+        openItem.setOnAction(new OpenFileEventHandler());
+        saveItem.setOnAction(new SaveFileEventHandler());
+        saveAsItem.setOnAction(new SaveAsFileEventHandler());
+
+        // 创建主界面
+        root = new BorderPane();
+        root.setTop(menuBar);
+
+        // 创建Tab页和文本编辑区
+        tabPane = new TabPane();
+        root.setCenter(tabPane);
+
+        // 创建状态栏
+        statusLabel = new Label("行: 1 \t列: 1 \t字数: 0");
+        root.setBottom(statusLabel);
+        BorderPane.setMargin(statusLabel, new Insets(5, 10, 5, 10));
+
+        // 创建场景并设置主界面
+        Scene scene = new Scene(root, 800, 600);
+        primaryStage.setScene(scene);
+        primaryStage.getIcons().add(new Image(iconSrc));
+        primaryStage.show();
+    }
+
+    // 新建文件事件处理器
+    private class NewFileEventHandler implements EventHandler<ActionEvent> {
+        @Override
+        public void handle(ActionEvent event) {
+            TextArea textArea = new TextArea(); // 创建新的文本编辑区
+            Tab tab = new Tab("新建文件 " + ++tabIndex); // 创建新的Tab页
+            tab.setContent(textArea);
+            tabPane.getTabs().add(tab);
+            tabPane.getSelectionModel().select(tab);
+            updateStatusLabel(textArea);
+        }
+    }
+
+    // 打开文件事件处理器
+    private class OpenFileEventHandler implements EventHandler<ActionEvent> {
+        @Override
+        public void handle(ActionEvent event) {
+            FileChooser fileChooser = new FileChooser();
+            File file = fileChooser.showOpenDialog(null);
+            if (file != null) {
+                try {
+                    BufferedReader reader = new BufferedReader(new FileReader(file));
+                    String line;
+                    StringBuilder textBuilder = new StringBuilder();
+                    while ((line = reader.readLine()) != null) {
+                        textBuilder.append(line).append("\n"); // 读取文件内容
+                    }
+                    reader.close();
+                    String text = textBuilder.toString();
+
+                    TextArea textArea = new TextArea(text); // 创建新的文本编辑区
+                    Tab tab = new Tab(file.getName()); // 创建新的Tab页
+                    tab.setContent(textArea);
+                    tab.setUserData(file); // 将文件对象保存到Tab页的UserData中
+                    tabPane.getTabs().add(tab);
+                    tabPane.getSelectionModel().select(tab);
+                    updateStatusLabel(textArea);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    // 保存文件事件处理器
+    private class SaveFileEventHandler implements EventHandler<ActionEvent> {
+        @Override
+        public void handle(ActionEvent event) {
+            Tab selectedTab = tabPane.getSelectionModel().getSelectedItem();
+            if (selectedTab != null) {
+                File file = (File) selectedTab.getUserData(); // 获取当前Tab页对应的文件对象
+                if (file.exists()) {
+                    try {
+                        BufferedWriter writer = new BufferedWriter(new FileWriter(file));
+                        TextArea textArea = (TextArea) selectedTab.getContent(); // 获取当前Tab页的文本编辑区
+                        String text = textArea.getText();
+                        writer.write(text); // 写入文件内容
+                        writer.flush();
+                        writer.close();
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+
+                } else {
+                    saveAsFile();
+                }
+            }
+        }
+    }
+
+    // 另存为文件事件处理器
+    private class SaveAsFileEventHandler implements EventHandler<ActionEvent> {
+        @Override
+        public void handle(ActionEvent event) {
+            saveAsFile();
+        }
+    }
+
+    // 另存为文件方法
+    private void saveAsFile() {
+        Tab selectedTab = tabPane.getSelectionModel().getSelectedItem();
+        if (selectedTab != null) {
+            FileChooser fileChooser = new FileChooser();
+            File file = fileChooser.showSaveDialog(null);
+            if (file != null) {
+                try {
+                    BufferedWriter writer = new BufferedWriter(new FileWriter(file));
+                    TextArea textArea = (TextArea) selectedTab.getContent(); // 获取当前Tab页的文本编辑区
+                    String text = textArea.getText();
+                    writer.write(text); // 写入文件内容
+                    writer.flush();
+                    writer.close();
+                    selectedTab.setText(file.getName()); // 更新Tab页标签上的文件名
+                    selectedTab.setUserData(file); // 将文件对象保存到Tab页的UserData中
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    // 更新状态栏
+    private void updateStatusLabel(TextArea textArea) {
+        textArea.caretPositionProperty().addListener((observable, oldValue, newValue) -> {
+            int row = getRow(textArea.getCaretPosition(), textArea.getText());
+            int column = getColumn(textArea.getCaretPosition(), textArea.getText());
+            int length = textArea.getLength();
+            statusLabel.setText("行: " + row + " \t列: " + column + " \t字数: " + length);
+        });
+    }
+
+    // 获取光标所在行数
+    private int getRow(int caretPosition, String text) {
+        return text.substring(0, caretPosition).split("\n").length;
+    }
+
+
+    // 获取光标所在列数
+    private int getColumn(int caretPosition, String text) {
+        return caretPosition - text.lastIndexOf("\n", caretPosition - 1);
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}