CODEWITHSUNDEEP
java
Pawan
Pawan

Reputation: 32321

How to add Special characters to the file name in this case

Before Storing a file i am checking if the file name already exists (to prevent overriding)

For this i am using the following code 

import java.io.File;
import java.util.ArrayList;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class Test {
    public static void main(String[] args) {
        String imagename = checkImage("big_buck_bunny.mp4");
        System.out.println(imagename);
    }

    public static String checkImage(String image_name) {
        String newimage = "";
        ArrayList<String> image_nameslist = new ArrayList<String>();
        File file = new File("C:\\Users\\Public\\Videos\\Sample Videos\\");
        File[] files = file.listFiles();
        for (File f : files) {
            image_nameslist.add(f.getName());
        }
        long l = System.currentTimeMillis();
        if (image_nameslist.contains(image_name)) {
            Random randomGenerator = new Random();
            int randomInt = randomGenerator.nextInt(100);
            Matcher matcher = Pattern.compile("(.*)\\.(.*?)").matcher(image_name);
            if (matcher.matches()) { // <== test input filename is OK?
                newimage = String.format("%s_%d.%s", matcher.group(1),randomInt, matcher.group(2));
            }
        }
        else {
            newimage = image_name;
        }
        return newimage;
    }
}

And the output i get is 

big_buck_bunny_50.mp4

In place of randomInt in the above code , is it possible to add some special characters @ before and after so that the output looks like\

big_buck_bunny_@[email protected]

Upvotes: 0

Views: 173

Answers (1)

Tim Biegeleisen
Tim Biegeleisen

Reputation: 521289

Just form a string with special characters using your random integer, and then include it in the call to String.format(). The only change I made to your call was to replace %d with %s and to use the random string instead of the random integer.

String randStr = "@" + String.valueOf(randomInt) + "@";
newimage = String.format("%s_%s.%s", matcher.group(1), randStr, matcher.group(2));

But, are you sure that your OS accepts/recommends such file names?

Upvotes: 1

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