XULRunner with Java: JavaXPCOM Tutorial 3

6 加载页面的W3C DOM访问
6.1 mozdom4java库
  访问W3C DOM树比访问Mozilla的DOM树要好，因为它是一个动态访问HTML和XML的DOM树的标准。为了实现这个，我们使用从Mozilla
DOM到W3C DOM的java Bridge。有一个叫做mozdom4java的项目http://mozdom4java.mozdev.org/index.html。
  下载这个包后，我们把jar包放到classpath里。例如，我们增加一个按钮来抽取HTML文档里的所有链接。
// When that button is pressed, then we obtain the HTML document corresponding to
// the URL loaded in browser. Next, we extract all its child nodes with 'a' tag name
// and print its content.
final ToolItem anchorItem = new ToolItem(toolbar, SWT.PUSH);
anchorItem.setImage(getImage("resources/anchors.png"));
anchorItem.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {

// First, we obtain a Mozilla DOM Document representation
nsIDOMDocument doc = browser.getDocument();

// Get all anchors from the loaded HTML document
nsIDOMNodeList nodeList = doc.getElementsByTagName("a");
for ( int i = 0; i < nodeList.getLength(); i++ ){

// Get Mozilla DOM node
nsIDOMNode mozNode = nodeList.item(i);

// Get the appropiate interface
nsIDOMHTMLAnchorElement mozAnchor =
(nsIDOMHTMLAnchorElement) mozNode.queryInterface(
nsIDOMHTMLAnchorElement.NS_IDOMHTMLANCHORELEMENT_IID);

// Get the corresponding W3C DOM node
HTMLAnchorElement a = (HTMLAnchorElement)
HTMLAnchorElementImpl.getDOMInstance(mozAnchor);