package io_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.io.OutputStream; public class IoTest { public static void main(String[] args) { File fileSrcFile1 = new File("e:\\新建文件夹.rar"); File fileDestFile1 = new File("e:\\demo\\新建文件夹.rar"); File fileSrcFileF1 = new File("e:\\复件 新建文件夹.rar"); File fileDestFileF1 = new File("e:\\demo\\复件 新建文件夹.rar"); try { long start1 = System.currentTimeMillis(); copyFile1(fileSrcFile1, fileDestFile1); long end1 = System.currentTimeMillis(); System.out.println("copyFile1耗时：" + (end1 - start1) / 1000.0); long start2 = System.currentTimeMillis(); copyFile2(fileSrcFileF1, fileDestFileF1); long end2 = System.currentTimeMillis(); System.out.println("copyFile2耗时：" + (end2 - start2) / 1000.0); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * 把源文件的内容复制到目标文件 * * @param src * 源文件 * @param dest * 目标文件 */ public static void copyFile1(File src, File dest) throws IOException { BufferedInputStream bis = null; BufferedOutputStream bos = null; byte[] b = new byte[8192]; try { bis = new BufferedInputStream(new FileInputStream(src)); bos = new BufferedOutputStream(new FileOutputStream(dest)); for (int count = -1; (count = bis.read(b)) != -1;) { bos.write(b, 0, count); } bos.flush(); } catch (IOException e) { throw e; } finally { close(bis); close(bos); } } /** * 把源文件的内容复制到目标文件 * * @param srcFile * 源文件 * @param destFile * 目标文件 */ public static void copyFile2(File srcFile, File destFile) throws IOException { FileInputStream input = new FileInputStream(srcFile); try { FileOutputStream output = new FileOutputStream(destFile); try { byte[] buffer = new byte[4096]; int n = 0; while (-1 != (n = input.read(buffer))) { output.write(buffer, 0, n); } } finally { try { if (output != null) { output.close(); } } catch (IOException ioe) { // ignore } } } finally { try { if (input != null) { input.close(); } } catch (IOException ioe) { // ignore } } } /** * 同时关闭输入流和输出流，并把可能抛出的异常转换成RuntimeException * * @param is * @param os */ public static void close(InputStream is, OutputStream os) { close(is); close(os); } /** * 关闭输入流的工具方法，并把可能抛出的异常转换成RuntimeException * * @param is */ public static void close(InputStream is) { if (is != null) { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 关闭输出流的工具方法，并把可能抛出的异常转换成RuntimeException * * @param os */ public static void close(OutputStream os) { if (os != null) { try { os.close(); } catch (IOException e) { e.printStackTrace(); } } } }