拷贝—标准文件到目标目录的方法

public void copy(File sourceFile,File targetDir){InputStream is = null;OutputStream os = null;try { is = new FileInputStream(sourceFile);File targetdir = new File(targetDir,sourceFile.getName());os = new FileOutputStream(targetdir);byte[] b = new byte[1024];int len =0 ;System.out.println("開始拷貝"+ sourceFile.getAbsolutePath());while((len = is.read(b))!=-1){os.write(b,0,len);}System.out.println("拷貝完成"+ targetDir.getAbsolutePath());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{try {if(is !=null)is.close();if(os != null)  os.close();} catch (IOException e) {e.printStackTrace();}}}public static void main(String[] args) {File file = new File("D:\\代码\\larva搞笑虫子\\1.mp4");File dir = new File("C:\\Users\\lx\\Desktop");new Demo3().copy(file, dir);}