Replace string in text document help please

Question

I am trying to make a simple program that changes all "http://" to "https://ssl." in a text document. This is the code I have created so far but the program is not working as intended. I am making this program so I can quicky change the links on my website to the secure webpages.
import java.io.*;
public class Main {
    public static void main(String[] args) {
        try {
            File f = new File("textFile.txt");
            RandomAccessFile raf = new RandomAccessFile(f , "rw");
            String line = raf.readLine();
            while(line != null){
            line = line.replaceAll("http://" , "https://ssl.");
            raf.writeChars(line);
            line = raf.readLine();
            raf.close();
        } catch (IOException e) {
}Any help welcome!

Answer 1

This is not a Java thing, but a general fact about files and I/O:
You can't edit a file in place. Do this:
1. Read the original file a line at a time.
2. Edit each line and write them out to a new file.
3. When you are done, close the files. Delete the original file and then rename the new file to the old file's name.