java.nio.FileChannelクラスを使用してファイルをコピーする
サンプルコード
package com.arkgame.demopro; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.nio.channels.FileChannel; public class FileCopyDemo { public static void main(String[] args) { File in = new File("C:\\data\\in_001.csv"); File out = new File("C:\\data\\out_002.csv"); try { FileCopyDemo.copyFile(in, out); } catch (IOException e) { e.printStackTrace(); } } public static void copyFile(File in, File out) throws IOException { @SuppressWarnings("resource") FileChannel inChannel = new FileInputStream(in).getChannel(); @SuppressWarnings("resource") FileChannel outChannel = new FileOutputStream(out).getChannel(); try { inChannel.transferTo(0, inChannel.size(), outChannel); } catch (IOException e) { throw e; } finally { if (inChannel != null) inChannel.close(); if (outChannel != null) outChannel.close(); } } }