Writes all characters from a Reader to a file using the default character encoding. : Writer « File Input Output « Java

1. Java
2. File Input Output
3. Writer

Writes all characters from a Reader to a file using the default character encoding.

   
/*
 * Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2006.
 *
 * Licensed under the Aduna BSD-style license.
 */
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

public class Main {
  
  /**
   * Writes all characters from a <tt>Reader</tt> to a file using the default
   * character encoding.
   *
   * @param reader The <tt>Reader</tt> containing the data to write to the
   * file.
   * @param file The file to write the data to.
   * @return The total number of characters written.
   * @throws IOException If an I/O error occured while trying to write the
   * data to the file.
   * @see java.io.FileWriter
   */
  public static final long writeToFile(Reader reader, File file)
    throws IOException
  {
    FileWriter writer = new FileWriter(file);

    try {
      return transfer(reader, writer);
    }
    finally {
      writer.close();
    }
  }
  /**
   * Transfers all characters that can be read from <tt>in</tt> to
   * <tt>out</tt>.
   *
   * @param in The Reader to read characters from.
   * @param out The Writer to write characters to.
   * @return The total number of characters transfered.
   */
  public static final long transfer(Reader in, Writer out)
    throws IOException
  {
    long totalChars = 0;
    int charsInBuf = 0;
    char[] buf = new char[4096];

    while ((charsInBuf = in.read(buf)) != -1) {
      out.write(buf, 0, charsInBuf);
      totalChars += charsInBuf;
    }

    return totalChars;
  }
}

   
    
    
  

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