content: package com.ruoyi.common.utils.file;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.io.UnsupportedEncodingException;
  import java.net.URLEncoder;
  import java.nio.charset.StandardCharsets;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * 文件处理工具类
   * 
   * @author ruoyi
   */
  public class FileUtils extends org.apache.commons.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 (!file.exists())
              {
                  throw new FileNotFoundException(filePath);
              }
              fis = new FileInputStream(file);
              byte[] b = new byte[1024];
              int length;
              while ((length = fis.read(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)
      {
          boolean flag = false;
          File file = new File(filePath);
          // 路径为文件且不为空则进行删除
          if (file.isFile() && file.exists())
          {
              file.delete();
              flag = true;
          }
          return flag;
      }
  
      /**
       * 文件名称验证
       * 
       * @param filename 文件名称
       * @return true 正常 false 非法
       */
      public static boolean isValidFilename(String filename)
      {
          return filename.matches(FILENAME_PATTERN);
      }
  
      /**
       * 下载文件名重新编码
       * 
       * @param request 请求对象
       * @param fileName 文件名
       * @return 编码后的文件名
       */
      public static String setFileDownloadHeader(HttpServletRequest request, String fileName)
              throws UnsupportedEncodingException
      {
          final String agent = request.getHeader("USER-AGENT");
          String filename = fileName;
          if (agent.contains("MSIE"))
          {
              // IE浏览器
              filename = URLEncoder.encode(filename, "utf-8");
              filename = filename.replace("+", " ");
          }
          else if (agent.contains("Firefox"))
          {
              // 火狐浏览器
              filename = new String(fileName.getBytes(), "ISO8859-1");
          }
          else if (agent.contains("Chrome"))
          {
              // google浏览器
              filename = URLEncoder.encode(filename, "utf-8");
          }
          else
          {
              // 其它浏览器
              filename = URLEncoder.encode(filename, "utf-8");
          }
          return filename;
      }
  
      /**
       * 下载文件名重新编码
       *
       * @param response 响应对象
       * @param realFileName 真实文件名
       * @return
       */
      public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException
      {
          String percentEncodedFileName = percentEncode(realFileName);
  
          StringBuilder contentDispositionValue = new StringBuilder();
          contentDispositionValue.append("attachment; filename=")
                  .append(percentEncodedFileName)
                  .append(";")
                  .append("filename*=")
                  .append("utf-8''")
                  .append(percentEncodedFileName);
  
          response.setHeader("Content-disposition", contentDispositionValue.toString());
      }
  
      /**
       * 百分号编码工具方法
       *
       * @param s 需要百分号编码的字符串
       * @return 百分号编码后的字符串
       */
      public static String percentEncode(String s) throws UnsupportedEncodingException
      {
          String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
          return encode.replaceAll("\\+", "%20");
      }
  }
  