Replace file

private static final String ENTER = "\r\n";
public void replaceByDirectory(File rootFile, String oldValue, String newValue) {
if (rootFile.isFile()) {
if (checkFile(rootFile.getName())) {
replaceFile(rootFile, oldValue, newValue);
}
} else if (rootFile.isDirectory()) {
File [] files = rootFile.listFiles();
for (File file : files) {
replaceByDirectory(file, oldValue, newValue);
}
}
}

private void replaceFile(File file, String oldValue, String newValue) {
if (file.exists()) {
boolean isFound = false;
List<String> content = this.readFile(file);
List<String> result = new ArrayList<String>();
for (String line : content) {
if (line.indexOf(oldValue) >= 0) {
result.add(line.replace(oldValue, newValue));
isFound = true;
} else {
result.add(line);
}
}

if (isFound) {
System.out.println(file.getName());
this.writeFile(result, file);
}
}
}

private List<String> readFile(File file) {
List<String> content = new ArrayList<String>();
if (file != null && file.isFile()) {
String line = null;
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(file));
while ((line = reader.readLine()) != null) {
content.add(line);
}
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return content;
}

private void writeFile(List<String> content, File file) {
if (file != null && file.isFile()) {
BufferedWriter writer;
try {
writer = new BufferedWriter(new FileWriter(file));
for (String line : content) {
writer.write(line);
writer.write(ENTER);
}

writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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