java实现本地文件转文件流发送到前端

Controller

  public void export(HttpServletResponse response) {// 创建file对象response.setContentType("application/octet-stream");// 文件名为 sresponse.setHeader("Content-Disposition", "attachment;fileName=" + s);FileUtils.writeBytes(fileName, response.getOutputStream());}

FileUtils

 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{IOUtils.close(os);IOUtils.close(fis);}}

如果是临时文件需要删除
controller

  public void repairStatisticListExport(HttpServletResponse response) {// 创建file对象response.setContentType("application/octet-stream");// 文件名为 sresponse.setHeader("Content-Disposition", "attachment;fileName=" + s);FileUtils.writeBytes(fileName, response.getOutputStream());FileUtils.deleteFile(fileName);}

deleteFile方法

  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;}

临时文件路径

  public static String getDefaultBaseDir() {String os = System.getProperty("os.name");if (os.toLowerCase().startsWith("windows")) {return "C:/uploadPath/";} else if (os.toLowerCase().startsWith("linux")) {return "/home/uploadPath/";}return "/home/uploadPath/";}