asked on

find the occurance of word using java

Hi

I have a file , ie HTML file , XML file .. .etc
i want a java method that calculates the number occurrence of a given term
ie:

public int method(String filename, String term)
return numberOfOcc

the term may be more than one word
the term may be in more than one line , at most two lines
ignore character cases

CEHJ

Is this classwork?

mohammedf

ASKER

nop

Mick Barry

first read the file line by line

http://helpdesk.objects.com.au/java/how-do-i-read-a-text-file-line-by-line

and for each line use the indexOf() String method to search for instances of term

mohammedf

ASKER

indexOf or contains ??

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Mick Barry

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mohammedf

ASKER

objects , thanks it works
but why 'contains' worked not correctly ??

Mick Barry

because you need to check if it appears more than once in the line

mohammedf

ASKER

the program goes to infinite loop and it seems it don't break the while loop objects ???

mohammedf

ASKER

here is the code

 public int calculateTermFreq(String part, String file) throws Exception {
        int cnt = 0;
        try {
            FileInputStream fstream = new FileInputStream("files//" + file);
            DataInputStream in = new DataInputStream(fstream);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String current = "";
            while ((current = br.readLine()) != null) {
                int start = 0;
                while (start >= 0) {
                    int index = current.indexOf(part, start);
                    if (index == -1) {
                        start = -1;
                    } else {
                        // found the term
                        cnt++;
                        start = index + part.length();
                        
                    }
                }
            }
            in.close();
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        }
 
        return cnt;
 
    }

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Mick Barry

looks fine, try adding some debug logging to determine where it is getting stuck
whats your text file look like?

mohammedf

ASKER

it is HTML file

CEHJ

Neither html files nor xml files are line-oriented, so it doesn't make much sense to read them linewise. Also, the phrase you're looking for could span more than one 'line'. Fortunately most html files at least are fairly small so it's best to read the file into a string to search. Line problems then disappear. See

http://www.technojeeves.com/joomla/index.php/free/93-file-to-string-in-java