/**
* 复制文件 * * @param srcFile * 源文件File * @param destDir * 目标目录File * @param newFileName * 新文件名 * @return 实际复制的字节数，如果文件、目录不存在、文件为null或者发生IO异常，返回-1 */ public static long copyFile1(File srcFile, File destDir, String newFileName) { long copySizes = 0; if (!srcFile.exists()) { System.out.println("源文件不存在"); copySizes = -1; } else if (!destDir.exists()) { System.out.println("目标目录不存在"); copySizes = -1; } else if (newFileName == null) { System.out.println("文件名为null"); copySizes = -1; } else { try { BufferedInputStream bin = new BufferedInputStream( new FileInputStream(srcFile)); BufferedOutputStream bout = new BufferedOutputStream( new FileOutputStream(new File(destDir, newFileName))); int b = 0, i = 0; while ((b = bin.read()) != -1) { bout.write(b); i++; } bout.flush(); bin.close(); bout.close(); copySizes = i;} catch (FileNotFoundException e) {
e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return copySizes; }/**
* 复制文件(以超快的速度复制文件) * * @param srcFile * 源文件File * @param destDir * 目标目录File * @param newFileName * 新文件名 * @return 实际复制的字节数，如果文件、目录不存在、文件为null或者发生IO异常，返回-1 */ public static long copyFile2(File srcFile, File destDir, String newFileName) { long copySizes = 0; if (!srcFile.exists()) { System.out.println("源文件不存在"); copySizes = -1; } else if (!destDir.exists()) { System.out.println("目标目录不存在"); copySizes = -1; } else if (newFileName == null) { System.out.println("文件名为null"); copySizes = -1; } else { try { FileChannel fcin = new FileInputStream(srcFile).getChannel(); FileChannel fcout = new FileOutputStream(new File(destDir, newFileName)).getChannel(); long size = fcin.size(); fcin.transferTo(0, fcin.size(), fcout); fcin.close(); fcout.close(); copySizes = size; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return copySizes; }