HTML to Text Converter.

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Terms of use

Displaying Source Code(s)

HTML to Text Converter.

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Description : This utility convert HTML code to text code.

import java.io.File;
import java.io.FileInputStream;

import java.io.Reader;
import java.io.StringReader;

import java.io.IOException;

/**
* Convert text/html into text/plain
*
* Auther: Omindra Kumar Rana
* Email: rana_omindra@yahoo.co.in
*
* @version 1.0 $Date: May 10, 2005 $
*/

public class HTML2Text
{
boolean body_found = false;
boolean in_body = false;
boolean center = false;
boolean pre = false;
String href = "";

public String convert(String source) throws Exception
{
StringBuffer result = new StringBuffer();
StringBuffer result2 = new StringBuffer();
StringReader input = new StringReader(source);

try
{
String text = null;
int c = input.read();

while (c != -1) // Convert until EOF
{
text = "";
if (c == '<') // It's a tag!!
{
String CurrentTag = getTag(input); // Get the rest of the tag
text = convertTag(CurrentTag);
}
else if (c == '&')
{
String specialchar = getSpecial(input);
if (specialchar.equals("lt;") || specialchar.equals("#60"))
text = "<";
else if (specialchar.equals("gt;") || specialchar.equals("#62"))
text = ">";
else if (specialchar.equals("amp;") || specialchar.equals("#38"))
text = "&";
else if (specialchar.equals("nbsp;"))
text = " ";
else if (specialchar.equals("quot;") || specialchar.equals("#34"))
text = """;
else if (specialchar.equals("copy;") || specialchar.equals("#169"))
text = "[Copyright]";
else if (specialchar.equals("reg;") || specialchar.equals("#174"))
text = "[Registered]";
else if (specialchar.equals("trade;") || specialchar.equals("#153"))
text = "[Trademark]";
else
text = "&" + specialchar;
}
else if (!pre && Character.isWhitespace((char)c))
{
StringBuffer s = in_body ? result : result2;
if (s.length() > 0 && Character.isWhitespace(s.charAt(s.length()-1)))
text = "";
else text = " ";
}
else
{
text = "" + (char)c;
}

StringBuffer s = in_body ? result : result2;
s.append(text);

c = input.read();
}
}
catch (Exception e)
{
input.close();
throw e;
}

StringBuffer s = body_found ? result : result2;
return s.toString().trim();
}

String getTag(Reader r) throws IOException
{
StringBuffer result = new StringBuffer();
int level = 1;

result.append('<');
while (level > 0)
{
int c = r.read();
if (c == -1) break; // EOF
result.append((char)c);
if (c == '<') level++; else if (c == '>') level--;
}

return result.toString();
}

String getSpecial(Reader r) throws IOException
{
StringBuffer result = new StringBuffer();
r.mark(1);//Mark the present position in the stream
int c = r.read();

while (Character.isLetter((char)c))
{
result.append((char)c);
r.mark(1);
c = r.read();
}

if (c == ';') result.append(';');
else r.reset();

return result.toString();
}

boolean isTag(String s1, String s2)
{
s1 = s1.toLowerCase();
String t1 = "<" + s2.toLowerCase() + ">";
String t2 = "<" + s2.toLowerCase() + " ";

return s1.startsWith(t1) || s1.startsWith(t2);
}

String convertTag(String t) throws IOException
{
String result = "";

if (isTag(t,"body"))
{ in_body = true; body_found = true; }
else if (isTag(t,"/body"))
{ in_body = false; result = " ; }
else if (isTag(t,"center"))
{ result = " ; center = true; }
else if (isTag(t,"/center"))
{ result = " ; center = false; }
else if (isTag(t,"pre"))
{ result = " ; pre = true; }
else if (isTag(t,"/pre"))
{ result = " ; pre = false; }
else if (isTag(t,"p"))
result = "
 ;
else if (isTag(t,"br"))
result = " ;
else if (isTag(t,"h1") || isTag(t,"h2") ||
isTag(t,"h3") ||isTag(t,"h4") || isTag(t,"h5") || isTag(t,"h6") || isTag(t,"h7"))
result = " ;
else if (isTag(t,"/h1") || isTag(t,"/h2") ||
isTag(t,"/h3") ||isTag(t,"/h4") || isTag(t,"/h5") || isTag(t,"/h6") || isTag(t,"/h7"))
result = " ;
else if (isTag(t,"/dl"))
result = " ;
else if (isTag(t,"dd"))
result = "
* ";
else if (isTag(t,"dt"))
result = " ";
else if (isTag(t,"li"))
result = "
* ";
else if (isTag(t,"/ul"))
result = " ;
else if (isTag(t,"/ol"))
result = " ;
else if (isTag(t,"hr"))
result = "_________________________________________
 ;
else if (isTag(t,"table"))
result = " ;
else if (isTag(t,"/table"))
result = " ;
else if (isTag(t,"form"))
result = " ;
else if (isTag(t,"/form"))
result = " ;
else if (isTag(t,"b"))
result = "*";
else if (isTag(t,"/b"))
result = "*";
else if (isTag(t,"i"))
result = """;
else if (isTag(t,"/i"))
result = """;
else if (isTag(t,"img"))
{
int idx = t.indexOf("alt="");
if (idx != -1)
{
idx += 5;
int idx2 = t.indexOf(""",idx);
result = t.substring(idx,idx2);
}
}
else if (isTag(t,"a"))
{
int idx = t.indexOf("href="");
if (idx != -1)
{
idx += 6;
int idx2 = t.indexOf(""",idx);
href = t.substring(idx,idx2);
}
else
{
href = "";
}
}
else if (isTag(t,"/a"))
{
if (href.length() > 0)
{
result = " [ " + href + " ]";
href = "";
}
}

return result;
}

public static void main(String argv[]) throws Exception
{
FileInputStream fis = null;
String s = null;

try
{
File file;
if (argv[0] != null) file = new File(argv[0]);
else file = new File("html_test_file.html");
fis = new FileInputStream(file);
byte buf[] = new byte[fis.available()];
//bytes that can be read from this file input stream without blocking

fis.read(buf);
fis.close();
fis = null;
s = new String(buf);
HTML2Text h = new HTML2Text();
System.out.println(h.convert(s));
}
catch (Exception e)
{
if (fis != null) fis.close();
throw e;
}
}