Java代码替换包含算术运算符的文件中的单词

Question

I have written a code that replaces only a particular word in a file. The code works fine however if I want to replace a word containing an arithmetic operator in it the code doesn't work. I have also tried to escape special characters but still, it doesn't work. Here is the code:

public void replacePassword(String newPass, String oldPass, String destFile) throws IOException {

    Path filePath = Paths.get(destFile);
    String fileContent = new String(Files.readAllBytes(filePath));
    //System.out.println(fileContent);
    fileContent = fileContent.replaceAll(Matcher.quoteReplacement(oldPass), Matcher.quoteReplacement(newPass));
    //System.out.println(fileContent);
    Files.write(filePath, fileContent.getBytes());
}

Kindly help me in solving this problem.

Answer 1

I think maybe you want to use method replace(target, replacement) and not replaceAll(regex, replacement). The difference between this two methods is that the second one expect regex. If you have luck and do not give any special character for the regex then it will be considered as string and work properly. That why you did not have problems before.

So please just try to change the method with replace(target, replacement) and tell us if you still have a problem.

Example:

public void replacePassword(String newPass, String oldPass, String destFile) throws IOException
{

    Path filePath = Paths.get(destFile);
    String fileContent = new String(Files.readAllBytes(filePath));
    //System.out.println(fileContent);
    //Here you use replace method not replaceAll!
    fileContent = fileContent.replace(Matcher.quoteReplacement(oldPass), Matcher.quoteReplacement(newPass));
    //System.out.println(fileContent);
    Files.write(filePath, fileContent.getBytes());

}