Example Program: Search Word in Folder files and print output


To Search a word in in list of files available in Folder, you need to find the list of files first and then scan each and every for required word. Below is the sample program to find the a given word Java in D:\\test folder of files.

package in.javatutorials;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.regex.MatchResult;

/**
* @author malliktalksjava
*
* Search for the files in a folder and prints all file details.
*
*/
public class WordCrawlerInFolder {

private static String directoryPath = “D://test”;
private static String searchWord = “Java”;
/**
* Creating constructor
*/
public WordCrawlerInFolder() {
super();
}

/**
* main method
*
* @param ags
*/
public static void main(String[] args) {
WordCrawlerInFolder crawler = new WordCrawlerInFolder();
File directory = new File(directoryPath);

if (directory == null || !directory.exists()) {
System.out.println(“Directory doesn’t exists!!!”);
return;
}

crawler.directoryCrawler(directory, searchWord);
}

/**
* Gets all the file and directories and prints accordingly
*
* @param directory
* Directory path where it should search
*/
public void directoryCrawler(File directory, String searchWord) {

// Get List of files in folder and print
File[] filesAndDirs = directory.listFiles();

// Print the root directory name
//System.out.println(“-” + directory.getName());

// Iterate the list of files, if it is identified as not a file call
// directoryCrawler method to list all the files in that directory.
for (File file : filesAndDirs) {

if (file.isFile()) {
searchWord(file, searchWord);
//System.out.println(” |-” + file.getName());
} else {
directoryCrawler(file, searchWord);
}
}
}

/**
* Search for word in a given file.
* @param file
* @param searchWord
*/
private void searchWord(File file, String searchWord){
Scanner scanFile;
try {
scanFile = new Scanner(file);
while (null != scanFile.findWithinHorizon(“(?i)\\b”+searchWord+”\\b”, 0)) {
MatchResult mr = scanFile.match();
System.out.printf(“Word found : %s at index %d to %d.%n”, mr.group(),
mr.start(), mr.end());
}
scanFile.close();
} catch (FileNotFoundException e) {
System.err.println(“Search File Not Found !!!!! “);
e.printStackTrace();
}
}
}

We have used some escape characters in above class searchWord() method, below is the notation for the same.

  1. (?i) turn on the case-insensitive switch
  2. \b means a word boundary
  3. java is the string searched for
  4. \b a word boundary again.

If search term contain special characters, it would be suggested to use \Q and \E around the string, as it quotes all characters in between. Make sure the input doesn’t contain \E itself.

Other Useful Links:

Javac/Java searching algorithm for other classes

Example program to reverse a Number in Java

How to find count of duplicates in a List

Threads Interview questions in Java

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About

I born in Good cultural place called India. My family is traditional family. We fallow all Indian traditions.

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Posted in JAVA
One comment on “Example Program: Search Word in Folder files and print output
  1. Rich says:

    Your means of describing everything iin this post is
    genuinely good, every one can easily know it, Thanks a lot.

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Mallikarjun Gunda

This is Mallikarjun Gunda, I am working as a software professional. Blogging is my Passion. This blog contains the posts on Java related technologies and programming languages. I am happy to share my knowledge through the blogs.

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