XULRunner with Java: JavaXPCOM Tutorial 二

XULRunner with Java: JavaXPCOM Tutorial 2

    package es.ladyr.javaxpcom.browser;      import org.eclipse.swt.SWT;      import org.eclipse.swt.browser.ProgressEvent;      import org.eclipse.swt.browser.ProgressListener;      import org.eclipse.swt.widgets.Display;      import org.eclipse.swt.widgets.Shell;      import org.mozilla.interfaces.*;      import org.eclipse.swt.browser.Browser;      import org.eclipse.swt.SWTError;      public class SimpleBrowser {              public static void main(String args[]) {                                           final Browser browser;                      Display display = new Display();                      Shell shell = new Shell(display);                      shell.setSize(800, 600);                      shell.open();                                           //Initiating the browser using SWT                      try {                                      browser = new Browser(shell, SWT.MOZILLA);                              } catch (SWTError e) {                                      System.out.println("Could not instantiate Browser: " + e.getMessage());                                      return;                              }                                                                                    // Adapt browser size to shell size                      browser.setBounds(shell.getClientArea());                      // Load an URL into the web browser                      browser.setUrl("http://www.google.com");                                           // Listens for page loading status.                      browser.addProgressListener(new ProgressListener() {                              public void changed(ProgressEvent event) {                              }                              public void completed(ProgressEvent event) {                                      nsIWebBrowser webBrowser = (nsIWebBrowser)browser.getWebBrowser();                                      nsIDOMWindow window = webBrowser.getContentDOMWindow();                                      nsIDOMDocument document = window.getDocument();                                      System.out.println(document);                              }                      });                      while (!shell.isDisposed()) {                              if (!display.readAndDispatch()) {                                      display.sleep();                              }                      }              }      }  

?

4 在java代码里嵌入Firefox3
? 现在可以去用一下有用的例子了。首先我们在一个java程序里使用SWT来嵌入一个Mozilla浏览器。现在，我们可以使用

org.eclipse.swt.browser.Browser类来实例化：browser = new Browser(shell, SWT.MOZILLA); 在这之前，我们需要使用ATF项目

，以及一下ATF插件。非常幸运，现在我们不需要这些补丁了。

4.1 配置环境
? 为了在java程序里嵌入Mozilla浏览器，我们需要使用SWT来创建窗口和嵌入浏览器。
? 4.1.1 安装swt
?? 下载对应操作系统的swt，加到classpath就好了
? 4.1.2 配置swt
?? 运行后面例子需要的jar包：
?? javaxpcom.jar
?? MozillaInterfaces.jar
?? MozillaGlue.jar
?? swt.jar
?? src.zip

4.2 Web Browser例子

?

接下来，我们将增加一下SWT widgets来实现通常的交换，比如输入url，前进与后退，菜单，和两种类型：
? 传入一个参数制定XULRunner的路径
? 不传入参数使用系统安装的XULRunner

    package es.ladyr.javaxpcom.browser;      import java.io.IOException;      import java.io.InputStream;      import org.eclipse.swt.SWT;      import org.eclipse.swt.browser.Browser;      import org.eclipse.swt.browser.ProgressEvent;      import org.eclipse.swt.browser.ProgressListener;      import org.eclipse.swt.events.SelectionAdapter;      import org.eclipse.swt.events.SelectionEvent;      import org.eclipse.swt.events.SelectionListener;      import org.eclipse.swt.graphics.Image;      import org.eclipse.swt.graphics.ImageData;      import org.eclipse.swt.layout.GridData;      import org.eclipse.swt.layout.GridLayout;      import org.eclipse.swt.widgets.Canvas;      import org.eclipse.swt.widgets.Combo;      import org.eclipse.swt.widgets.Display;      import org.eclipse.swt.widgets.Menu;      import org.eclipse.swt.widgets.MenuItem;      import org.eclipse.swt.widgets.Shell;      import org.eclipse.swt.widgets.ToolBar;      import org.eclipse.swt.widgets.ToolItem;      public class LadyrBrowser {              private static final int WIDTH = 800;              private static final int HEIGHT = 600;                           Browser browser;              private Combo uriCombo;              private final ToolItem backItem;              private final ToolItem forwardItem;              /**              *              * @param xulrunnerPath if you have a XULRunner valid version in your system, but not              *      installed, you can use that version to run the browser. This param must contain              *      its path, or null in other case.              */              public LadyrBrowser(String xulrunnerPath) {                      Display display = new Display();                      Shell shell = new Shell(display);                      shell.setSize(WIDTH, HEIGHT);                                                                GridLayout gridLayout = new GridLayout(1, true);                      shell.setLayout(gridLayout);                      // Set the menu bar                      // create the menu                      Menu menuBar = new Menu(shell, SWT.BAR);                      // create a file menu and add an exit item                      final MenuItem file = new MenuItem(menuBar, SWT.CASCADE);                      file.setText("&File");                      final Menu filemenu = new Menu(shell, SWT.DROP_DOWN);                      file.setMenu(filemenu);                      final MenuItem exitMenuItem = new MenuItem(filemenu, SWT.PUSH);                      exitMenuItem.setText("&Exit/tCTRL+E");                      exitMenuItem.setAccelerator(SWT.CTRL + 'E');                      exitMenuItem.addSelectionListener(new SelectionAdapter() {                              public void widgetSelected(SelectionEvent event) {                                      System.exit(0);                              }                      });                      // create a Help menu and add an about item                      final MenuItem helpMenuItem = new MenuItem(menuBar, SWT.CASCADE);                      helpMenuItem.setText("&Help");                      final Menu helpmenu = new Menu(shell, SWT.DROP_DOWN);                      helpMenuItem.setMenu(helpmenu);                      final MenuItem aboutMenuItem = new MenuItem(helpmenu, SWT.PUSH);                      aboutMenuItem.setText("&About");                      shell.setMenuBar(menuBar);                      // Set the toolbar                      ToolBar toolbar = new ToolBar(shell, SWT.FLAT);                      backItem = new ToolItem(toolbar, SWT.PUSH);                      backItem.setImage(getImage("resources/back.png"));                      backItem.setEnabled(false);                      forwardItem = new ToolItem(toolbar, SWT.PUSH);                      forwardItem.setImage(getImage("resources/forward.png"));                      forwardItem.setEnabled(false);                      backItem.addSelectionListener(new SelectionAdapter() {                              public void widgetSelected(SelectionEvent event) {                                      if (browser.isBackEnabled()) {                                              browser.back();                                      }                              }                      });                      forwardItem.addSelectionListener(new SelectionAdapter() {                              public void widgetSelected(SelectionEvent event) {                                      if (browser.isForwardEnabled()) {                                              browser.forward();                                      }                              }                      });                      final ToolItem refreshItem = new ToolItem(toolbar, SWT.PUSH);                      refreshItem.setImage(getImage("resources/refresh.png"));                      refreshItem.addSelectionListener(new SelectionAdapter() {                              public void widgetSelected(SelectionEvent event) {                                      browser.refresh();                              }                      });                      final ToolItem stopItem = new ToolItem(toolbar, SWT.PUSH);                      stopItem.setImage(getImage("resources/stop.png"));                      stopItem.addSelectionListener(new SelectionAdapter() {                              public void widgetSelected(SelectionEvent event) {                                      browser.stop();                              }                      });                      uriCombo = new Combo(toolbar, SWT.NONE);                      uriCombo.setItems(new String[] { "www.ladyr.com", "www.urjc.es",                                      "www.mozilla.org" });                      uriCombo.setText("http://www.google.es");                      uriCombo.setBounds(0, 0, 3 * (WIDTH / 4), 0);                      uriCombo.addSelectionListener(new SelectionListener() {                              public void widgetSelected(SelectionEvent e) {                                      Combo c = (Combo) e.widget;                                      browser.setUrl(c.getText());                                      System.out.println(c.getText());                              }                              public void widgetDefaultSelected(SelectionEvent e) {                                      Combo c = (Combo) e.widget;                                      browser.setUrl(c.getText());                                      System.out.println(c.getText());                              }                      });                      final ToolItem uriComboItem = new ToolItem(toolbar, SWT.SEPARATOR);                      uriComboItem.setWidth(uriCombo.getSize().x);                      uriComboItem.setControl(uriCombo);                      final ToolItem goItem = new ToolItem(toolbar, SWT.PUSH);                      goItem.setImage(getImage("resources/go.png"));                      goItem.addSelectionListener(new SelectionAdapter() {                              public void widgetSelected(SelectionEvent event) {                                      browser.setUrl(uriCombo.getText());                              }                      });                      GridData data = new GridData();                      data.horizontalAlignment = SWT.FILL;                      toolbar.setLayoutData(data);                      toolbar.pack();                      // Set the page visualization area                      Canvas canvas = new Canvas(shell, SWT.BORDER);                      data = new GridData();                      // Set the same dimensions than shell, after we will call pack method                      // to fit the canvas size to the shell size.                      data.horizontalAlignment = SWT.FILL;                      data.verticalAlignment = SWT.FILL;                      data.widthHint = WIDTH;                      data.heightHint = HEIGHT;                      canvas.setLayoutData(data);                      shell.pack();                      shell.open();                      // Browser code                      initMozillaBrowser(uriCombo.getText(), canvas, xulrunnerPath);                      // End of browser code                      while (!shell.isDisposed()) {                              if (!display.readAndDispatch()) {                                      display.sleep();                              }                      }                      display.dispose();              }              /**              *              * @param uri              * @param canvas              * @param xulrunnerPath if you have a XULRunner valid version in your system, but not              *      installed, you can use that version to run the browser. This param must contain              *      its path, or null in other case.              */              private void initMozillaBrowser(String uri, Canvas canvas,                              String xulrunnerPath) {                      browser = new Browser(canvas, SWT.MOZILLA);                  //nsIWebBrowser webBrowser = (nsIWebBrowser)browser.getWebBrowser();                                                               browser.setBounds(canvas.getClientArea());                      browser.setUrl(uri);                      browser.addProgressListener(new ProgressListener() {                              public void changed(ProgressEvent event) {                                      uriCombo.setText(browser.getUrl());                                      updateToolItemsState();                              }                              public void completed(ProgressEvent event) {                                      updateToolItemsState();                              }                      });              }                                       private Image getImage(String path) {                      InputStream sourceStream = this.getClass().getResourceAsStream(path);                      ImageData source = new ImageData(sourceStream);                      Image image = new Image(null, source);                      try {                              sourceStream.close();                      } catch (IOException e) {                              e.printStackTrace();                      }                      return image;              }              private void updateToolItemsState() {                      if (!backItem.isEnabled() && browser.isBackEnabled()) {                              backItem.setEnabled(true);                      } else if (backItem.isEnabled() && !browser.isBackEnabled()) {                              backItem.setEnabled(false);                      }                      if (!forwardItem.isEnabled() && browser.isForwardEnabled()) {                              forwardItem.setEnabled(true);                      } else if (forwardItem.isEnabled() && !browser.isForwardEnabled()) {                              forwardItem.setEnabled(false);                      }              }              public static void main(String[] args) {                      if (args.length > 0) {                              new LadyrBrowser(args[0]);                      } else {                              new LadyrBrowser(null);                      }              }      }  

?

5. 在浏览器里访问JavaXPCOM
?? 这一节里我们将讨论一下通过WebBrowser访问的功能。比如，改变浏览器的属性或者观察浏览器请求与响应。
?? 首先我们改变用户的preferences
?? 注：我只列出增加的部分代码。

?

    public class SimpleBrowserWithPrefs {                    // Obtain preferences service                    String contractID = "@mozilla.org/preferences-service;1";                    nsIPrefService prefService = (nsIPrefService) serviceManager                                    .getServiceByContractID(contractID,                                                    nsIPrefService.NS_IPREFSERVICE_IID);                    // Get a branch to access to the entire preference tree                    nsIPrefBranch branch = prefService.getBranch("");                                       // Set some preferences                    // Warn before submitting a form to an insecure area ? -> False                    branch.setBoolPref("security.warn_submit_insecure", 0);                                       // Select direction of text:                    //   1 : Left-to-right                    //   2 : Right-to-left                    branch.setIntPref("bidi.direction", 2);                                       // Allow current document to specify colors to use?                    // (If false, background images will also not be loaded)                    branch.setBoolPref("browser.display.use_document_colors", 0);              }  

?

另外一下Service也能被使用。我们已经可以改变Mozilla的属性来改变浏览器的行为，但是通过利用Service我们可以完成更有用的

任务。在下面的例子里我们将观察浏览器的请求和响应。在XPCOM里存在一个接口叫nsIObserver，它运行观察一个topic相关的event

，只要它被添加到observer Service里了。添加的方法是使用 void nsIObserverService.addObserver(nsIObserver anObserver,

String aTopic, boolean ownsWeak) 这个方法对一个特定的topic注册一个listener。anObserver是用来接受通知的一个接口，

aTopic是通知的topic，ownsWeak当nsIObserverService hold anObserver的一个strong的引用时设为false，否则设置为true。因此

，为了创建一个observer，我们必需实现nsIObserver接口，这个接口包含了一个方法 public void observe(nsISupports

aSubject, String aTopic, String aData)。

下面的例子的4个步骤：
? 1，获得Service Manager
? 2，获得Observer Service
? 3，创建一个简单的HTTP observer
? 4，把这个observer添加到监听请求和响应的Service里

package es.ladyr.javaxpcom.browser; import org.eclipse.swt.SWT; import org.eclipse.swt.SWTError; import org.eclipse.swt.browser.Browser; import org.eclipse.swt.browser.ProgressEvent; import org.eclipse.swt.browser.ProgressListener; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.mozilla.xpcom.Mozilla; import org.mozilla.interfaces.*; public class SimpleBrowserWithObserver { public SimpleBrowserWithObserver(String xulrunnerPath) { final Browser browser; Display display = new Display(); Shell shell = new Shell(display); shell.setSize(800, 600); shell.open(); // If you have XULRunner installed, you can call the constructor without // the last parameter: // // final MozillaBrowser browser = new MozillaBrowser(shell,SWT.BORDER); // // That last parameter is the path for XULRunner files // (where you have uncompressed downloaded XULRunner package). try { browser = new Browser(shell, SWT.MOZILLA); } catch (SWTError e) { System.out.println("Could not instantiate Browser: " + e.getMessage()); return; } // Get ServiceManager nsIServiceManager serviceManager = Mozilla.getInstance().getServiceManager(); // Get Observer Service nsIObserverService observerService = (nsIObserverService) serviceManager .getServiceByContractID("@mozilla.org/observer-service;1", nsIObserverService.NS_IOBSERVERSERVICE_IID); // Create a simple HTTP observer SimpleHTTPObserver httpObserver = new SimpleHTTPObserver(); // Add our observer to the service for listen to request and responses observerService.addObserver(httpObserver, "http-on-modify-request", false); observerService.addObserver(httpObserver, "http-on-examine-response", false); // Adapt browser size to shell size browser.setBounds(shell.getClientArea()); // Load an URL into the web browser browser.setUrl("http://www.google.com"); // Listens for page loading status. browser.addProgressListener(new ProgressListener() { public void changed(ProgressEvent event) { } public void completed(ProgressEvent event) { nsIWebBrowser webBrowser = (nsIWebBrowser)browser.getWebBrowser(); if (webBrowser == null) { System.out.println("Could not get the nsIWebBrowser from the Browser widget"); } nsIDOMWindow window = webBrowser.getContentDOMWindow(); nsIDOMDocument doc = window.getDocument(); System.out.println(doc); } }); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } observerService.removeObserver(httpObserver, "http-on-modify-request"); } public static void main(String args[]) { String xulrunnerPath = null; if ( args.length > 0 ) { xulrunnerPath = args[0]; } new SimpleBrowserWithObserver(xulrunnerPath); } /** * Simple HTTP observer listen to requests and responses. * * @author alpgarcia * */ class SimpleHTTPObserver implements nsIObserver { private int nRequests = 0; private int nResponses = 0; public void observe(nsISupports aSubject, String aTopic, String aData) { // You can read corresponding javadoc for this method, here we have pasted // some interesting lines from there: // // Observe will be called when there is a notification for the topic. // This assumes that the object implementing this interface has been registered // with an observer service such as the nsIObserverService. // If you expect multiple topics/subjects, the impl is responsible for filtering. // // You should not modify, add, remove, or enumerate notifications in the // implemention of observe. // Get the channel for listen to from notification specific interface pointer. nsIHttpChannel httpChannel = (nsIHttpChannel) aSubject.queryInterface(nsIHttpChannel.NS_IHTTPCHANNEL_IID); // Our observer can listen to request or responses, it depends on the // notification topic or subject. if (aTopic.equals("http-on-modify-request")) { nRequests++; System.out.println("/n---- BEGIN REQUEST NUMBER " + nRequests + " ----/n"); httpChannel.visitRequestHeaders(new nsIHttpHeaderVisitor() { public void visitHeader(String header, String value) { System.out.println("Header: " + header + " -- Value: " + value); } public nsISupports queryInterface(String arg0) { return null; } }); System.out.println(" Method: " + httpChannel.getRequestMethod()); System.out.println(" Name: " + httpChannel.getName()); System.out.println(" Host: " + getRequestHeader(httpChannel, "host")); System.out.println(" User Agent: " + getRequestHeader(httpChannel, "user-agent")); System.out.println(" Accept: " + httpChannel.getRequestHeader("accept")); System.out.println(" Accept Language: " + getRequestHeader(httpChannel, "accept- language")); System.out.println(" Accept Encoding: " + getRequestHeader(httpChannel, "accept- encoding")); System.out.println(" Accept Charset: " + getRequestHeader(httpChannel, "accept- charset")); System.out.println(" Keep Alive: " + getRequestHeader(httpChannel, "keep-alive")); System.out.println(" Connection: " + getRequestHeader(httpChannel, "connection")); System.out.println(" Cookie: " + getRequestHeader(httpChannel, "cookie")); System.out.println("/n---- END REQUEST NUMBER " + nRequests + " ----/n"); } else if (aTopic.equals("http-on-examine-response")) { nResponses++; System.out.println("/n---- BEGIN RESPONSE NUMBER " + nResponses + " ----/n"); httpChannel.visitResponseHeaders(new nsIHttpHeaderVisitor() { public void visitHeader(String header, String value) { System.out.println("Header: " + header + " -- Value: " + value); } public nsISupports queryInterface(String arg0) { return null; } }); System.out.println(" Status: " + httpChannel.getResponseStatus()); System.out.println(" Status Text: " + httpChannel.getResponseStatusText()); System.out.println(" Content Type: " + httpChannel.getContentType()); System.out.println(" Content Length: " + httpChannel.getContentLength()); System.out.println(" Content Encoding: " + getResponseHeader(httpChannel, "content -encoding")); System.out.println(" Server: " + getResponseHeader(httpChannel, "server")); System.out.println("/n---- END RESPONSE NUMBER " + nResponses + " ----/n"); } } public nsISupports queryInterface(String uuid) { return Mozilla.queryInterface(this, uuid); } private String getRequestHeader(nsIHttpChannel httpChannel, String header) { try { return httpChannel.getRequestHeader(header); } catch (Exception e) { return "Header Not Found"; } } private String getResponseHeader(nsIHttpChannel httpChannel, String header) { try { return httpChannel.getResponseHeader(header); } catch (Exception e) { return "Header Not Found"; } } } ?

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