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);
	}