用文件通道（FileChannel）来实现文件复制，供大家参考，具体内容如下

不考虑多线程优化，单线程文件复制最快的方法是(文件越大该方法越有优势，一般比常用方法快30+%):

直接上代码：

package test; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.nio.channels.FileChannel; public class Test {public static void main(String[] args) {File source = new File("E:\\tools\\fmw_12.1.3.0.0_wls.jar");File target = new File("E:\\tools\\fmw_12.1.3.0.0_wls-copy.jar");long start, end;start = System.currentTimeMillis();fileChannelCopy(source, target);end = System.currentTimeMillis();System.out.println("文件通道用时：" + (end - start) + "毫秒");start = System.currentTimeMillis();copy(source, target);end = System.currentTimeMillis();System.out.println("普通缓冲用时：" + (end - start) + "毫秒");}/** * 使用文件通道的方式复制文件 * @param source 源文件 * @param target 目标文件 */ public static void fileChannelCopy(File source, File target) { FileInputStream in = null; FileOutputStream out = null; FileChannel inChannel = null; FileChannel outChannel = null; try { in = new FileInputStream(source); out = new FileOutputStream(target); inChannel = in.getChannel();//得到对应的文件通道 outChannel = out.getChannel();//得到对应的文件通道 inChannel.transferTo(0, inChannel.size(), outChannel);//连接两个通道，并且从inChannel通道读取，然后写入outChannel通道 } catch (IOException e) { e.printStackTrace(); } finally { try { in.close(); inChannel.close(); out.close(); outChannel.close(); } catch (IOException e) { e.printStackTrace(); } } } /*** 普通缓冲复制* @param source 源文件* @param target 目标文件*/public static void copy (File source, File target) {InputStream in = null;BufferedOutputStream out = null;try {in = new BufferedInputStream(new FileInputStream(source));out = new BufferedOutputStream(new FileOutputStream(target));byte[] buf = new byte[4096];int i;while ((i = in.read(buf)) != -1) {out.write(buf, 0, i);}} catch (Exception e) {e.printStackTrace();} finally {try {if (null != in) {in.close();}if (null != out) {out.close();}} catch (IOException e) {e.printStackTrace();}}} } }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。