文件下载（参考若依后台管理系统）

文件下载（参考若依后台管理系统）

文件工具类

/*** 文件处理工具类* * @author ruoyi*/
public class FileUtils extends org.apachemons.io.FileUtils
{public static String FILENAME_PATTERN = "[a-zA-Z0-9_\-\|\.\u4e00-\u9fa5]+";/*** 输出指定文件的byte数组* * @param filePath 文件路径* @param os 输出流* @return*/public static void writeBytes(String filePath, OutputStream os) throws IOException{FileInputStream fis = null;try{File file = new File(filePath);if (!ists()){throw new FileNotFoundException(filePath);}fis = new FileInputStream(file);byte[] b = new byte[1024];int length;while ((length = ad(b)) > 0){os.write(b, 0, length);}}catch (IOException e){throw e;}finally{if (os != null){try{os.close();}catch (IOException e1){e1.printStackTrace();}}if (fis != null){try{fis.close();}catch (IOException e1){e1.printStackTrace();}}}}/*** 删除文件* * @param filePath 文件* @return*/public static boolean deleteFile(String filePath)