Copy chars from a large (over 2GB) Reader to a Writer. : File « File « Android






  1. Android
  2. File
  3. File

Copy chars from a large (over 2GB) Reader to a Writer.

     
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

class Main {
  private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
  /**
   * Copy chars from a large (over 2GB) <code>Reader</code> to a
   * <code>Writer</code>.
   * <p>
   * This method buffers the input internally, so there is no need to use a
   * <code>BufferedReader</code>.
   * 
   * @param input
   *            the <code>Reader</code> to read from
   * @param output
   *            the <code>Writer</code> to write to
   * @return the number of characters copied
   * @throws NullPointerException
   *             if the input or output is null
   * @throws IOException
   *             if an I/O error occurs
   * @since Commons IO 1.3
   */
  public static long copyLarge(Reader input, Writer output)
      throws IOException {
    char[] buffer = new char[DEFAULT_BUFFER_SIZE];
    long count = 0;
    int n = 0;
    while (-1 != (n = input.read(buffer))) {
      output.write(buffer, 0, n);
      count += n;
    }
    return count;
  }
}








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