101 lines
3.1 KiB
Java
101 lines
3.1 KiB
Java
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HTML Parse Demo
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import java.io.*;
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import java.net.*;
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import javax.swing.text.*;
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import javax.swing.text.html.*;
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import javax.swing.text.html.parser.*;
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public class HtmlParseDemo {
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public static void main(String [] args) {
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Reader r;
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if (args.length == 0) {
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System.err.println("Usage: java HTMLParseDemo [url | file]");
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System.exit(0);
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}
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String spec = args[0];
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try {
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if (spec.indexOf("://") > 0) {
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URL u = new URL(spec);
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Object content = u.getContent();
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if (content instanceof InputStream) {
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r = new InputStreamReader((InputStream)content);
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}
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else if (content instanceof Reader) {
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r = (Reader)content;
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}
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else {
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throw new Exception("Bad URL content type.");
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}
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}
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else {
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r = new FileReader(spec);
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}
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HTMLEditorKit.Parser parser;
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System.out.println("About to parse " + spec);
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parser = new ParserDelegator();
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parser.parse(r, new HTMLParseLister(), true);
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r.close();
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}
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catch (Exception e) {
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System.err.println("Error: " + e);
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e.printStackTrace(System.err);
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}
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}
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}
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/**
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* HTML parsing proceeds by calling a callback for
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* each and every piece of the HTML document. This
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* simple callback class simply prints an indented
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* structural listing of the HTML data.
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*/
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class HTMLParseLister extends HTMLEditorKit.ParserCallback
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{
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int indentSize = 0;
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protected void indent() {
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indentSize += 3;
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}
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protected void unIndent() {
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indentSize -= 3; if (indentSize < 0) indentSize = 0;
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}
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protected void pIndent() {
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for(int i = 0; i < indentSize; i++) System.out.print(" ");
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}
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public void handleText(char[] data, int pos) {
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pIndent();
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System.out.println("Text(" + data.length + " chars)");
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}
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public void handleComment(char[] data, int pos) {
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pIndent();
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System.out.println("Comment(" + data.length + " chars)");
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}
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public void handleStartTag(HTML.Tag t, MutableAttributeSet a, int pos) {
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pIndent();
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System.out.println("Tag start(<" + t.toString() + ">, " +
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a.getAttributeCount() + " attrs)");
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indent();
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}
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public void handleEndTag(HTML.Tag t, int pos) {
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unIndent();
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pIndent();
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System.out.println("Tag end( }
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public void handleSimpleTag(HTML.Tag t, MutableAttributeSet a, int pos) {
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pIndent();
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System.out.println("Tag(<" + t.toString() + ">, " +
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a.getAttributeCount() + " attrs)");
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}
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public void handleError(String errorMsg, int pos){
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System.out.println("Parsing error: " + errorMsg + " at " + pos);
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}
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}
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