How to read a log file and parse the entries in Java?

I have silly question, but I'm unprofessional. I am trying to make a logs reader in Java, which will read the logs from directory. It must recognizes errors,informations and warnings. Which solution will be t开发者_高级运维he best(the fastest) in this case: FileInputStream with BufferedReader or FileReader with BufferedReader? Or maybe something else.

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BufferedReader in = new BufferedReader(new FileReader("log.txt"));
String line1 = in.readLine();

is about as fast as you can get. BufferedReader buffers your input so it's faster than simply using FileReader. And in case you were wondering, Scanner is significantly slower than BufferedReader.

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For choosing between a FileInputStream or a FileReader, it depends on what you want to work with - bytes (FileInputStream) or text / characters 'a', 'b', ... (FileReader). If you have the log files as plain text, it would make sense to use a FileReader.

Note that a FileReader uses an encoding, read the JavaDoc.