package sample;

import org.cyberneko.html.parsers.DOMParser; import org.w3c.dom.Document; import org.w3c.dom.Node;

public class TestHTMLDOM { public static void main(String[] argv) throws Exception { DOMParser parser = new DOMParser(); for (int i = 0; i < argv.length; i++) { parser.parse(argv[i]); print(parser.getDocument(), ""); } } public static void print(Node node, String indent) { // System.out.println(indent+node.getClass().getName()); if (node.getNodeValue() != null){ if("".equals(node.getNodeValue().trim())){ }else{ System.out.print(indent); System.out.println(node.getNodeValue()); } } Node child = node.getFirstChild(); while (child != null) { print(child, indent+" "); child = child.getNextSibling(); } } }

cd $NEKOHTML _HOME
cp build_html.xml build.xml
ant
java -cp nekohtml .jar;nekohtmlSamples.jar;xmlParserAPIs.jar;xercesImpl.jar sample.TestHTMLDOM test.html

package net.nutch.fetcher;
...
import org.cyberneko.html.parsers.*;
import org.xml.sax.*;
import org.w3c.dom.*;
import org.w3c.dom.html.*;
import org.apache.html.dom.*;

/* A simple fetcher. */ public class Fetcher { .... private DOMFragmentParser parser = new DOMFragmentParser(); .... private void handleFetch(URL url, FetchListEntry fle, Http.Response response) throws IOException, SAXException { //判断HTTP应答包的类型，只放过html文件 String contentType = response.getHeader("Content-Type"); if (contentType != null && !contentType.startsWith("text/html")) throw new IOException("Unknown content-type: " + contentType); //创建文件片段对象 DocumentFragment node = new HTMLDocumentImpl().createDocumentFragment(); //解析HTML内容 parser.parse(new InputSource(new ByteArrayInputStream(response.getContent())),node); //取得全部文本内容 StringBuffer sb = new StringBuffer(); getText(sb, node); String text = sb.toString(); //取得标题信息 sb.setLength(0); getTitle(sb, node); String title = sb.toString().trim(); //取得该页所有的出链 ArrayList l = new ArrayList(); getOutlinks(url, l, node); //显示结果，存储信息 Outlink[] outlinks = (Outlink[])l.toArray(new Outlink[l.size()]); LOG.fine("found " + outlinks.length + " outlinks in " + url);

outputPage(new FetcherOutput(fle, MD5Hash.digest(response.getContent()), true, title, outlinks), new FetcherContent(response.getContent()), new FetcherText(text)); } private static void getText(StringBuffer sb, Node node) { if (node.getNodeType() == Node.TEXT_NODE) { sb.append(node.getNodeValue());//取得结点值，即开始与结束标签之间的信息 } NodeList children = node.getChildNodes(); if ( children != null ) { int len = children.getLength(); for ( int i = 0; i < len; i++ ) { getText(sb, children.item(i));//递归遍历DOM树 } } }

private static boolean getTitle(StringBuffer sb, Node node) { if (node.getNodeType() == Node.ELEMENT_NODE) { if ("title".equalsIgnoreCase(node.getNodeName())) { getText(sb, node); return true; } } NodeList children = node.getChildNodes(); if (children != null) { int len = children.getLength(); for (int i = 0; i < len; i++) { if (getTitle(sb, children.item(i))) { return true; } } } return false; }

private static void getOutlinks(URL base, ArrayList outlinks, Node node) { if (node.getNodeType() == Node.ELEMENT_NODE) { if ("a".equalsIgnoreCase(node.getNodeName())) { StringBuffer linkText = new StringBuffer(); getText(linkText, node);

NamedNodeMap attrs = node.getAttributes(); String target= null; for (int i= 0; i < attrs.getLength(); i++ ) { if ("href".equalsIgnoreCase(attrs.item(i).getNodeName())) { target= attrs.item(i).getNodeValue();//在DOM树中，属性是一个结点。 break; } } if (target != null) try { URL url = new URL(base, target); outlinks.add(new Outlink(url.toString(),linkText.toString().trim())); } catch (MalformedURLException e) { // don't care } } } NodeList children = node.getChildNodes(); if ( children != null ) { int len = children.getLength(); for ( int i = 0; i < len; i++ ) { getOutlinks(base, outlinks, children.item(i));//递归遍历DOM树 } } } .... }

package sample;

import org.apache.xerces.parsers.AbstractSAXParser; import org.cyberneko.html.HTMLConfiguration;

public class HTMLSAXParser extends AbstractSAXParser { public HTMLSAXParser() { super(new HTMLConfiguration()); } }

// settings on HTMLConfiguration
org.apache.xerces.xni.parser.XMLParserConfiguration config =new org.cyberneko.html.HTMLConfiguration();
config.setFeature("http://cyberneko.org/html/features/augmentations", true);
config.setProperty("http://cyberneko.org/html/properties/names/elems", "lower");

// settings on DOMParser org.cyberneko.html.parsers.DOMParser parser = new org.cyberneko.html.parsers.DOMParser(); parser.setFeature("http://cyberneko.org/html/features/augmentations", true); parser.setProperty("http://cyberneko.org/html/properties/names/elems", "lower");

XMLDocumentFilter noop = new DefaultFilter();
XMLDocumentFilter[] filters = { noop };

XMLParserConfiguration parser = new HTMLConfiguration(); parser.setProperty("http://cyberneko.org/html/properties/filters", filters);