swt编写的浏览器

我想用rcp做，在找资料的时候搜到的，多的不说了，代码如下：
package src;
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.CloseWindowListener;
import org.eclipse.swt.browser.LocationEvent;
import org.eclipse.swt.browser.LocationListener;
import org.eclipse.swt.browser.OpenWindowListener;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.StatusTextEvent;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.browser.WindowEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

/**
 * This class implements a web browser
 */
public class TestBrowser {
    // The "at rest" text of the throbber

    private Label throbber;

    private Button button;

    private Combo url;

    private Button button_4;

    private Button button_3;

    private Browser browser;

    private Browser browser2;

    private Label status;

    private Button button_2;

    private Button button_1;

    private static final String AT_REST = "Ready";

    private String[] urlList = new String[256];

    int urlListItemCount = 0;

    /**
     * Runs the application
     *
     * @param location
     * the initial location to display
     */
    public void run(String location) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Advanced Browser");
        createContents(shell, location);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }

    /**
     * Creates the main window's contents
     *
     * @param shell
     * the main window
     * @param location
     * the initial location
     */
    public void createContents(Shell shell, String location) {
        shell.setLayout(new FormLayout());

        // Create the composite to hold the buttons and text field

        Composite controls = new Composite(shell, SWT.NONE);
        FormData data = new FormData();
        data.top = new FormAttachment(0, 0);
        data.left = new FormAttachment(0, 0);
        data.right = new FormAttachment(100, 0);
        controls.setLayoutData(data);

        // Create the status bar

        status = new Label(shell, SWT.NONE);
        data = new FormData();
        data.left = new FormAttachment(0, 0);
        data.right = new FormAttachment(100, 0);
        data.bottom = new FormAttachment(100, 0);
        status.setLayoutData(data);

        // Create the web browser

        browser = new Browser(shell, SWT.BORDER);
        browser.addOpenWindowListener(new OpenWindowListener() {
            public void open(WindowEvent arg0) {
                String urlStr = arg0.browser.getUrl();
                int flag = 1;
                browser.setVisible(false);
                browser2.setVisible(true);
                arg0.browser = browser2;
                for (int i = 0; i < urlListItemCount; i++) {
                    if (urlList[i].equals(urlStr)) {
                        flag = 0;
                    }
                }
                if (flag == 1) {
                    urlList[urlListItemCount] = urlStr;
                    url.add(urlStr);
                    url.setText(urlStr);
                    urlListItemCount++;
                }
            }
        });
        data = new FormData();
        data.top = new FormAttachment(controls);
        data.bottom = new FormAttachment(status);
        data.left = new FormAttachment(0, 0);
        data.right = new FormAttachment(100, 0);
        browser.setLayoutData(data);

        // Create the web browser

        browser2 = new Browser(shell, SWT.BORDER);
        browser2.addOpenWindowListener(new OpenWindowListener() {
            public void open(WindowEvent arg0) {
                String urlStr = arg0.browser.getUrl();
                int flag = 1;
                browser2.setVisible(false);
                browser.setVisible(true);
                arg0.browser = browser;
                for (int i = 0; i < urlListItemCount; i++) {
                    if (urlList[i].equals(urlStr)) {
                        flag = 0;
                    }
                }
                if (flag == 1) {
                    urlList[urlListItemCount] = urlStr;
                    url.add(urlStr);
                    url.setText(urlStr);
                    urlListItemCount++;
                }
            }
        });
        data = new FormData();
        data.top = new FormAttachment(controls);
        data.bottom = new FormAttachment(status);
        data.left = new FormAttachment(0, 0);
        data.right = new FormAttachment(100, 0);
        browser2.setLayoutData(data);

        // Create the controls and wire them to the browser

        controls.setLayout(new GridLayout(7, false));

        // Create the back button

        button_1 = new Button(controls, SWT.PUSH);
        button_1.setText("Back");
        button_1.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                browser.back();
            }
        });

        // Create the forward button

        button_2 = new Button(controls, SWT.PUSH);
        button_2.setText("Forward");
        button_2.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                browser.forward();
            }
        });

        // Create the refresh button

        button_3 = new Button(controls, SWT.PUSH);
        button_3.setText("Refresh");
        button_3.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                browser.refresh();
            }
        });

        // Create the stop button

        button_4 = new Button(controls, SWT.PUSH);
        button_4.setText("Stop");
        button_4.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                browser.stop();
            }
        });

        // Create the address entry field and set focus to it

        url = new Combo(controls, SWT.ARROW_DOWN);
        url.setLayoutData(new GridData(296, SWT.DEFAULT));
        url.setSize(600, url.getSize().y);
        url.setFocus();

        // Create the go button

        button = new Button(controls, SWT.PUSH);
        button.setText("Go");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                String urlStr = url.getText();
                int flag = 1;
                browser.setUrl(urlStr);
                for (int i = 0; i < urlListItemCount; i++) {
                    if (urlList[i].equals(urlStr)) {
                        flag = 0;
                    }
                }
                if (flag == 1) {
                    urlList[urlListItemCount] = urlStr;
                    url.add(urlStr);
                    urlListItemCount++;
                }
            }
        });

        // Create the animated "throbber"

        throbber = new Label(controls, SWT.NONE);
        throbber.setText(AT_REST);

        // Allow users to hit enter to go to the typed URL

        shell.setDefaultButton(button);

        // Add event handlers

        browser.addCloseWindowListener(new AdvancedCloseWindowListener());
        browser.addLocationListener(new AdvancedLocationListener(url));
        browser.addProgressListener(new AdvancedProgressListener(throbber));
        browser.addStatusTextListener(new AdvancedStatusTextListener(status));

        // Go to the initial URL

        if (location != null) {
            browser.setUrl(location);
        }
    }

    /**
     * This class implements a CloseWindowListener for TestBrowser
     */
    class AdvancedCloseWindowListener implements CloseWindowListener {
        /**
         * Called when the parent window should be closed
         */
        public void close(WindowEvent event) {
            // Close the parent window

            ((Browser) event.widget).getShell().close();
        }
    }

    /**
     * This class implements a LocationListener for TestBrowser
     */
    class AdvancedLocationListener implements LocationListener {
        // The address text box to update

        private Combo location;

        /**
         * Constructs an AdvancedLocationListener
         *
         * @param text
         * the address text box to update
         */
        public AdvancedLocationListener(Combo text) {
            // Store the address box for updates

            location = text;
        }

        /**
         * Called before the location changes
         *
         * @param event
         * the event
         */
        public void changing(LocationEvent event) {
            // Show the location that's loading

            location.setText("Loading " + event.location + "...");
        }

        /**
         * Called after the location changes
         *
         * @param event
         * the event
         */
        public void changed(LocationEvent event) {
            // Show the loaded location

            location.setText(event.location);
        }
    }

    /**
     * This class implements a ProgressListener for TestBrowser
     */
    class AdvancedProgressListener implements ProgressListener {
        // The label on which to report progress

        private Label progress;

        /**
         * Constructs an AdvancedProgressListener
         *
         * @param label
         * the label on which to report progress
         */
        public AdvancedProgressListener(Label label) {
            // Store the label on which to report updates

            progress = label;
        }

        /**
         * Called when progress is made
         *
         * @param event
         * the event
         */
        public void changed(ProgressEvent event) {
            // Avoid divide-by-zero

            if (event.total != 0) {
                // Calculate a percentage and display it

                int percent = (int) (event.current / event.total);
                progress.setText(percent + "%");
            } else {
                // Since we can't calculate a percent, show confusion :-)

                progress.setText("???");
            }
        }

        /**
         * Called when load is complete
         *
         * @param event
         * the event
         */
        public void completed(ProgressEvent event) {
            // Reset to the "at rest" message

            progress.setText(AT_REST);
        }
    }

    /**
     * This class implements a StatusTextListener for TestBrowser
     */
    class AdvancedStatusTextListener implements StatusTextListener {
        // The label on which to report status

        private Label status;

        /**
         * Constructs an AdvancedStatusTextListener
         *
         * @param label
         * the label on which to report status
         */
        public AdvancedStatusTextListener(Label label) {
            // Store the label on which to report status

            status = label;
        }

        /**
         * Called when the status changes
         *
         * @param event
         * the event
         */
        public void changed(StatusTextEvent event) {
            // Report the status

            status.setText(event.text);
        }
    }

    /**
     * The application entry point
     *
     * @param args
     * the command line arguments
     */
    public static void main(String[] args) {
        new TestBrowser().run(args.length == 0 ? null : args[0]);
    }
}