If you are able to use the library, I recommend it. :-)
private boolean contentEquals(File file1, File file2) throws IOException {
boolean file1Exists = file1.exists();
if (file1Exists != file2.exists()) {
return false;
}
if (!file1Exists) {
// two not existing files are equal
return true;
}
if (file1.isDirectory() || file2.isDirectory()) {
// don't want to compare directory contents
throw new IOException("Can't compare directories, only files");
}
if (file1.length() != file2.length()) {
// lengths differ, cannot be equal
return false;
}
if (file1.getCanonicalFile().equals(file2.getCanonicalFile())) {
// same file
return true;
}
FileInputStream fileStream1 = new FileInputStream(file1);
FileInputStream fileStream2 = new FileInputStream(file2);
BufferedInputStream bufferedStream1 = new BufferedInputStream(fileStream1);
BufferedInputStream bufferedStream2 = new BufferedInputStream(fileStream2);
int ch = bufferedStream1.read();
while (-1 != ch) {
int ch2 = bufferedStream2.read();
if (ch != ch2) {
return false;
}
ch = bufferedStream1.read();
}
int ch2 = bufferedStream2.read();
bufferedStream1.close();
bufferedStream2.close();
return (ch2 == -1);
}
