在浏览器中怎么添加一个工具栏，比如文件！

package html;import java.io.IOException;
import java.net.URL;
import javax.swing.*;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import java.awt.*; 
import java.awt.event.*;import javax.swing.event.*;public class HtmlBrower extends JFrame {//定义类 
           JPanel contentPane;//包含整个框架的容器 
           BorderLayout borderLayoutAll=new BorderLayout(); 
           JLabel jLabelPrompt=new JLabel();//状态提示框
           JPanel tooBar;
           JToolBar toolbar = new JToolBar();
           JButton blackButton = new JButton();
           JPanel jPanelMain=new JPanel(); //包含地址栏和URL内容显示框的容器
           BorderLayout borderLayoutMain=new BorderLayout();
           JTextField textFieldURL=new JTextField();//定义地址栏
           JEditorPane jEditorPane=new JEditorPane(); //URL内容显示窗口 
           public HtmlBrower(){ //构造函数 
            try{ jbInit(); 
            } 
            catch(Exception e){ 
            e.printStackTrace(); 
            } 
            } 
           
private void jbInit()
           throws Exception{ //界面初始化 
            contentPane=(JPanel)getContentPane();
            contentPane.setLayout(borderLayoutAll);
            jPanelMain.setLayout(borderLayoutMain); 
            jLabelPrompt.setText("简单的HTML浏览器，请在text框内输入完整的URL ");
            
            textFieldURL.setText(""); //开始运行时，清空地址栏
            textFieldURL.addActionListener(new java.awt.event.ActionListener(){ 
            public void actionPerformed(ActionEvent e){ //输入URL，回车后执行 
            textFieldURL_actionPerformed(e); } }); 
            jEditorPane.setEditable(false); //网页显示部分不可修改 
            jEditorPane.addHyperlinkListener(new javax.swing.event.HyperlinkListener(){ 
            public void hyperlinkUpdate(HyperlinkEvent e){ 
            jEditorPane_hyperlinkUpdate(e); //点击超级连接后执行 
            } 
            });
            JScrollPane scrollPane=new JScrollPane(); 
            scrollPane.getViewport().add(jEditorPane);
            toolbar.add(blackButton,"North");
                   jPanelMain.add(textFieldURL,"North"); 
                   jPanelMain.add(scrollPane,"Center"); 
                   contentPane.add(jLabelPrompt,"North"); 
                   contentPane.add(jPanelMain,"Center");
                   enableEvents(AWTEvent.WINDOW_EVENT_MASK); //启动事件监视 
                   this.setSize(new Dimension(600,500)); //窗口大小 
                   this.setTitle("SQL注入防御系统"); //设置标题 
                   this.setVisible(true); //显示窗口 
                   } 
           void textFieldURL_actionPerformed(ActionEvent e){ 
            try{ jEditorPane.setPage(textFieldURL.getText()); //显示URL内容 
            } 
            catch(IOException ex){ 
            JOptionPane msg=new JOptionPane(); 
            JOptionPane.showMessageDialog(this,"不正确的URL地址"+textFieldURL.getText(),"不正确的输入",0);
            } 
            } 
           void jEditorPane_hyperlinkUpdate(HyperlinkEvent e){ 
            if(e.getEventType()==javax.swing.event.HyperlinkEvent.EventType.ACTIVATED){ 
            try{ URL url=e.getURL(); //获得最新URL 
            jEditorPane.setPage(url); //显示超级连接内容 
            textFieldURL.setText(url.toString()); //修改地址栏
            } catch(IOException io){ 
            JOptionPane msg=new JOptionPane();
            JOptionPane.showMessageDialog(this,"不能打开连接","不正确的输入",0);
            } 
            } 
            } 
           protected void processWindowEvent(WindowEvent e){ 
            super.processWindowEvent(e); 
            if(e.getID()==WindowEvent.WINDOW_CLOSING){ //关闭窗口 
            System.exit(0); //退出 
            } 
            } 
           public static void main(String[] args){ //主函数 
            new HtmlBrower(); 
            }
            
            
            
           }