java JDK自带的HTML解析器 (HTMLEditorKit.Parser) 示例详解编程语言

* This small demo program shows how to use the * HTMLEditorKit.Parser and its implementing class * ParserDelegator in the Swing system. public class HtmlParseDemo { public static void main(String [] args) { Reader r; if (args.length == 0) { System.err.println("Usage: java HTMLParseDemo [url | file]"); System.exit(0); String spec = args[0]; try { if (spec.indexOf("://") 0) { URL u = new URL(spec); Object content = u.getContent(); if (content instanceof InputStream) { r = new InputStreamReader((InputStream)content); else if (content instanceof Reader) { r = (Reader)content; else { throw new Exception("Bad URL content type."); else { r = new FileReader(spec); HTMLEditorKit.Parser parser; System.out.println("About to parse " + spec); parser = new ParserDelegator(); parser.parse(r, new HTMLParseLister(), true); r.close(); catch (Exception e) { System.err.println("Error: " + e); e.printStackTrace(System.err); }

HTMLParseLister.java

/** 

 * HTML parsing proceeds by calling a callback for 

 * each and every piece of the HTML do*****ent. This 

 * simple callback class simply prints an indented 

 * structural listing of the HTML data. 

class HTMLParseLister extends HTMLEditorKit.ParserCallback 

 int indentSize = 0; 

 protected void indent() { 

 indentSize += 3; 

 protected void unIndent() { 

 indentSize -= 3; if (indentSize 0) indentSize = 0; 

 protected void pIndent() { 

 for(int i = 0; i indentSize; i++) System.out.print(" "); 

 public void handleText(char[] data, int pos) { 

 pIndent(); 

 System.out.println("Text(" + data.length + " chars)"); 

 public void handleComment(char[] data, int pos) { 

 pIndent(); 

 System.out.println("Comment(" + data.length + " chars)"); 

 public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) { 

 pIndent(); 

 System.out.println("Tag start( " + t.toString() + " , " + 

 a.getAttributeCount() + " attrs)"); 

 indent(); 

 public void handleEndTag(HTML.Tag t, int pos) { 

 unIndent(); 

 pIndent(); 

 System.out.println("Tag end( /" + t.toString() + " 

 public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, int pos) { 

 pIndent(); 

 System.out.println("Tag( " + t.toString() + " , " + 

 a.getAttributeCount() + " attrs)"); 

 public void handleError(String errorMsg, int pos){ 

 System.out.println("Parsing error: " + errorMsg + " at " + pos); 

}

10473.html

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