Java文件下载代码

public static void DownLoadFile(String filePath, String fileName,

                  HttpServletResponse response) throws Exception {

            System.out.println("filepath:" + filePath);

            File file = new File(filePath);

            if (!file.exists()) {

                  System.out.println("文件不存在");

            } else {

                  FileInputStream fis = new FileInputStream(file);

                  BufferedInputStream bis = new BufferedInputStream(fis);

 

                  OutputStream os = response.getOutputStream();

                  BufferedOutputStream bos = new BufferedOutputStream(os);

 

                  fileName = URLEncoder.encode(fileName, "UTF-8");

                  fileName = new String(fileName.getBytes("UTF-8"), "GBK");

 

                  response.reset();

                  response.setContentType("UTF-8");

                  response.setContentType("Application/x-msdownload");

                  response.setHeader("Content-Disposition", "attachment;filename="

                              + fileName);

                  response.setHeader("Content-Length", String

                              .valueOf(bis.available()));

 

                  int bytesRead = 0;

                  byte[] buffer = new byte[1024];

                  while ((bytesRead = bis.read(buffer)) != -1) {

                        bos.write(buffer, 0, bytesRead);

                  }

                  bos.flush();

                  bos.close();

                  bis.close();

 

                  os.close();

                  fis.close();

            }

      }