hashmaps, string buffers, and tokenizers

jin · Aug 2, 2001

Hi,

I have a short project...basically, I have a HashMap with several words in it. I also have a input html file with some text in it.

My project is that I have to make a new file...which has the same contents has the input file, BUT if any of the words from the Map shows up in the inputfile, I have to make those words hyperlinks.

For example, if the word "computer" is in the hashmap...and "The computer has 128 megs of RAM" is in the input.html file...i would create a new html file that says "The computer has 128 megs of RAM" -- BUT here 'computer' would be a hyperlink. (Thus, in the end, I would have a new HTML file which would have links to all words in the hashmap.)

I realllllllllllly need help here. I bet to many of you this is a simple problem!

( In the hashmap the key is the word, and the value is the hyperlink code. )

-Jin
jinen@hiphopsite.com

jin · Aug 2, 2001

i don't even know if i have to use string buffer/string tokenizers....someone told me i should --> but i don't know how!

thanks again

-jin

Vepo · Aug 3, 2001

Hi jin,

Smells like a homework

Well, ok, here is somekind of example, it's not implemented the best possible way and it's case-sensitive... and it doesn't recognize words like <TAG>word. You have to figure those out by yourself

But here is an example:
_______________________________________________________
import java.util.*;
import java.io.*;

public class HttpLinks
{
public static void main(String[] argv)
{
new HttpLinks();
}

public HttpLinks()
{
_links = new HashMap(); // HashMap containing link names and destination address
_links.put("computer", "

http://computer.com");

try
{
BufferedReader br = new BufferedReader(new FileReader("source.html&quot

); // Open source doc

String line = null;
// StringBuffer is used because its much faster to use than 'String s1 += String s2'
StringBuffer source = new StringBuffer();

while((line = br.readLine()) != null) // Read document to StringBuffer
{
source.append(line);
}
checkLinks(source.toString());

}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}

/**
* Check if source html document contains links defined in HashMap.
*/
private void checkLinks(String src_)
{
StringTokenizer st = new StringTokenizer(src_, " &quot

; // Use space as delimiter

int tokens = st.countTokens(); // Number of tokens in document
StringBuffer dest = new StringBuffer(); // Temporary storage

for(int i=0; i<tokens; i++) // go through all tokens
{
String token = st.nextToken();
if(_links.containsKey(token)) // Token found in HashMap, add link
{
String linkDest = (String)_links.get(token);
dest.append("<a href=\"&quot

.append(linkDest).append("\">&quot

.append(token).append("</a> &quot

;
}
else
{
dest.append(token).append(" &quot

;
}
}
save(dest.toString()); // Save to disk
}

/**
* Save ready html document
*/
private void save(String dest_)
{
try
{
PrintWriter pw = new PrintWriter(new FileWriter("dest.html&quot

);
pw.println(dest_);
pw.flush();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}

private HashMap _links;
}
______________________________________________________

I tested this only once and had a very simle html-document, source.html:
<HTML>
<BODY>
The computer has 128 megs of RAM
</BODY>
</HTML>

So it should work somehow...

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hashmaps, string buffers, and tokenizers

jin

Programmer

jin

Programmer

Vepo

Programmer

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