OptimizedRandomAccessFile

Java's RandomAccessFile is slow, as there is no buffering. However it allows both random access to data and line-by-line reading via readLine(), and thus is quite handy if you want to operate on large files (binary or text).

This is a drop-in replacement for Java's RandomAccessFile that adds buffering, originally available here

The original version treated all characters as chars; this updated version allows to handle any kind of text encoding. For example this is how to read a UTF-8 encoded line via readLine():

   try {
       OptimizedRandomAccessFile raf = new OptimizedRandomAccessFile(filename, "r");
       String line = raf.readLine();
       String utf8 = new String(line.getBytes("ISO-8859-1"), "UTF-8");
       System.out.println(utf8);
   } catch (IOException e) {
       e.printStackTrace();
   }

The version available on maven is outdated and does not contain the update.

All credits to the original author Joos Kiener. The original readme is below.

IO

Classe(s) for improving IO in Java. Currently there is only 1 class in this library. OptimizedRandomAccessFile

java.io.RandomAccessFile has a readLine() method with terrible performance. It reads files byte per byte and that is very slow.

OptimizedRandomAccessFile wraps java.io.RandomAccessFile and exposes all methods while having a readLine() method that performs similar to java.io.BufferedReader and hence about 100 times faster than that of java.io.RandomAccessFile while preserving correct random access.