1，java通过浏览器下载文件

    @ApiOperation(value = "导出", notes = "", response = String.class)@GetMapping("/export")public HttpServletResponse export(String path, HttpServletResponse response) {
//        String path = "/home/lilun.txt";try {// path是指欲下载的文件的路径。File file = new File(path);// 取得文件名。String filename = file.getName();// 取得文件的后缀名。String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();// 以流的形式下载文件。InputStream fis = new BufferedInputStream(new FileInputStream(path));byte[] buffer = new byte[fis.available()];fis.read(buffer);fis.close();// 清空responseresponse.reset();// 设置response的Headerresponse.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));response.addHeader("Content-Length", "" + file.length());OutputStream toClient = new BufferedOutputStream(response.getOutputStream());response.setContentType("application/octet-stream");toClient.write(buffer);toClient.flush();toClient.close();} catch (IOException ex) {ex.printStackTrace();}return response;}

2，复制文件到其他文件夹

    //复制文件到指定文件夹public void copyFile(String path){int lastIndex = path.lastIndexOf("/");String fileName = path.substring(lastIndex+1,path.length());String targetDir = "/home/fy/targetexportdata/";String targetDirFile = targetDir+fileName;File fs = new File(targetDir);if (!fs.exists()) {fs.mkdirs();}try (FileInputStream fis = new FileInputStream(path);FileOutputStream fos = new FileOutputStream(targetDirFile)) {byte[] buffer = new byte[1024];int bytesRead;while ((bytesRead = fis.read(buffer)) != -1) {fos.write(buffer, 0, bytesRead);}System.out.println("文件复制成功！");} catch (IOException e) {e.printStackTrace();}}