利用Java实现网页浏览器一个菜单栏（文件、编辑、视图）、两个工具栏、带有滚动条的JEditorPane。菜单栏中，文件的热键是F，包括另存为（热键A，快捷键CTRL+S）和退出（热键I，快捷键CTRL+E）两个菜单项；编辑的热键是E，包括后退（快捷键CTRL+Z）和前进（快捷键CTRL+D）两个菜单项；视图的热键是V，包括全屏（快捷键CTRL+U）、查看源代码（热键C，快捷键CTRL+C）、刷新（快捷键CTRL+R）。一个工具栏包括三个按钮：另存为、后退、前进、查看源代码、退出；另外一个工具栏包括一个label（地址），一个文本框JTextField和一个按钮（转向）。 另存为、前进、后退、查看源文件

下面是一个实现Java网页浏览器的代码，包含菜单栏、工具栏、JEditorPane等组件：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

public class Browser extends JFrame implements ActionListener {
    private JEditorPane editorPane;
    private JTextField textField;
    private JLabel label;
    private JToolBar toolbar1, toolbar2;
    private JButton backButton, forwardButton, saveButton, viewSourceButton, goButton;
    private JMenuItem saveMenuItem, exitMenuItem, backMenuItem, forwardMenuItem, viewSourceMenuItem, fullScreenMenuItem, refreshMenuItem;

    public Browser() {
        setTitle("Java Web Browser");
        setSize(800, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建菜单栏
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        // 创建文件菜单
        JMenu fileMenu = new JMenu("File");
        fileMenu.setMnemonic(KeyEvent.VK_F);
        menuBar.add(fileMenu);

        // 创建文件菜单项
        saveMenuItem = new JMenuItem("Save As", KeyEvent.VK_A);
        saveMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_DOWN_MASK));
        saveMenuItem.addActionListener(this);
        fileMenu.add(saveMenuItem);

        exitMenuItem = new JMenuItem("Exit", KeyEvent.VK_I);
        exitMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, InputEvent.CTRL_DOWN_MASK));
        exitMenuItem.addActionListener(this);
        fileMenu.add(exitMenuItem);

        // 创建编辑菜单
        JMenu editMenu = new JMenu("Edit");
        editMenu.setMnemonic(KeyEvent.VK_E);
        menuBar.add(editMenu);

        // 创建编辑菜单项
        backMenuItem = new JMenuItem("Back", KeyEvent.VK_B);
        backMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z, InputEvent.CTRL_DOWN_MASK));
        backMenuItem.addActionListener(this);
        editMenu.add(backMenuItem);

        forwardMenuItem = new JMenuItem("Forward", KeyEvent.VK_F);
        forwardMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, InputEvent.CTRL_DOWN_MASK));
        forwardMenuItem.addActionListener(this);
        editMenu.add(forwardMenuItem);

        // 创建视图菜单
        JMenu viewMenu = new JMenu("View");
        viewMenu.setMnemonic(KeyEvent.VK_V);
        menuBar.add(viewMenu);

        // 创建视图菜单项
        fullScreenMenuItem = new JMenuItem("Full Screen", KeyEvent.VK_U);
        fullScreenMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_U, InputEvent.CTRL_DOWN_MASK));
        fullScreenMenuItem.addActionListener(this);
        viewMenu.add(fullScreenMenuItem);

        viewSourceMenuItem = new JMenuItem("View Source", KeyEvent.VK_C);
        viewSourceMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_DOWN_MASK));
        viewSourceMenuItem.addActionListener(this);
        viewMenu.add(viewSourceMenuItem);

        refreshMenuItem = new JMenuItem("Refresh", KeyEvent.VK_R);
        refreshMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, InputEvent.CTRL_DOWN_MASK));
        refreshMenuItem.addActionListener(this);
        viewMenu.add(refreshMenuItem);

        // 创建工具栏1
        toolbar1 = new JToolBar();
        add(toolbar1, BorderLayout.PAGE_START);

        backButton = new JButton(new ImageIcon("back.png"));
        backButton.setToolTipText("Back");
        backButton.addActionListener(this);
        toolbar1.add(backButton);

        forwardButton = new JButton(new ImageIcon("forward.png"));
        forwardButton.setToolTipText("Forward");
        forwardButton.addActionListener(this);
        toolbar1.add(forwardButton);

        saveButton = new JButton(new ImageIcon("save.png"));
        saveButton.setToolTipText("Save As");
        saveButton.addActionListener(this);
        toolbar1.add(saveButton);

        viewSourceButton = new JButton(new ImageIcon("view.png"));
        viewSourceButton.setToolTipText("View Source");
        viewSourceButton.addActionListener(this);
        toolbar1.add(viewSourceButton);

        // 创建工具栏2
        toolbar2 = new JToolBar();
        add(toolbar2, BorderLayout.PAGE_END);

        label = new JLabel("Address:");
        toolbar2.add(label);

        textField = new JTextField();
        textField.setPreferredSize(new Dimension(500, 20));
        toolbar2.add(textField);

        goButton = new JButton("Go");
        goButton.addActionListener(this);
        toolbar2.add(goButton);

        // 创建JEditorPane组件
        editorPane = new JEditorPane();
        editorPane.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(editorPane);
        add(scrollPane, BorderLayout.CENTER);

        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == backButton || e.getSource() == backMenuItem) {
            // 后退
            if (editorPane != null && editorPane.canGoBack()) {
                editorPane.goBack();
            }
        } else if (e.getSource() == forwardButton || e.getSource() == forwardMenuItem) {
            // 前进
            if (editorPane != null && editorPane.canGoForward()) {
                editorPane.goForward();
            }
        } else if (e.getSource() == saveButton || e.getSource() == saveMenuItem) {
            // 另存为
            JFileChooser fileChooser = new JFileChooser();
            int option = fileChooser.showSaveDialog(this);
            if (option == JFileChooser.APPROVE_OPTION) {
                File file = fileChooser.getSelectedFile();
                try {
                    FileWriter writer = new FileWriter(file);
                    writer.write(editorPane.getText());
                    writer.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        } else if (e.getSource() == viewSourceButton || e.getSource() == viewSourceMenuItem) {
            // 查看源代码
            String url = editorPane.getPage().toString();
            try {
                URLConnection conn = new URL(url).openConnection();
                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                StringBuilder sb = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                }
                reader.close();
                String source = sb.toString();

                JFrame sourceFrame = new JFrame("Source of " + url);
                JTextArea sourceArea = new JTextArea();
                sourceArea.setText(source);
                JScrollPane sourcePane = new JScrollPane(sourceArea);
                sourceFrame.add(sourcePane);
                sourceFrame.setSize(800, 600);
                sourceFrame.setVisible(true);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == goButton) {
            // 转向
            String url = textField.getText();
            try {
                editorPane.setPage(url);
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == refreshMenuItem) {
            // 刷新
            try {
                editorPane.setPage(editorPane.getPage().toString());
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == fullScreenMenuItem) {
            // 全屏
            setExtendedState(JFrame.MAXIMIZED_BOTH);
        } else if (e.getSource() == exitMenuItem) {
            // 退出
            System.exit(0);
        }
    }

    public static void main(String[] args) {
        new Browser();
    }
}

注意，为了使菜单栏、工具栏、JEditorPane等组件能够响应事件，需要实现ActionListener接口，并重写actionPerformed()方法。在该方法中，根据触发事件的组件来执行对应的操作，如后退、前进、另存为、查看源代码等。