SpringBoot实现文件下载

Springboot实现文件下载

由于之前写过相对路径的文件下载 老是有问题 这次采用的是绝对路径的文件下载
需要注意的是项目中必须要有这个文件

	/**
	 * 下载免责声明
	 * @param response
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	@RequestMapping(value = "/download" ,method = {RequestMethod.POST , RequestMethod.GET})
	public String downLoad(HttpServletResponse response) throws UnsupportedEncodingException {
		//项目绝对路径
		String path = System.getProperty("user.dir");
		String filename="公寓入住知情(免责)告知书.pdf";
		pathPdf = path+"\\yanglao-ams\\yanglao-ams-biz\\src\\main\\resources\\pdf\\"+filename;

		File file = new File(pathPdf);
		if(file.exists()){ //判断文件父目录是否存在
			response.setContentType("application/vnd.ms-excel;charset=UTF-8");
			response.setCharacterEncoding("UTF-8");
			// response.setContentType("application/force-download");
			response.setHeader("Content-Disposition", "attachment;fileName=" +   java.net.URLEncoder.encode(filename,"UTF-8"));
			byte[] buffer = new byte[1024];
			FileInputStream fis = null; //文件输入流
			BufferedInputStream bis = null;

			OutputStream os = null; //输出流
			try {
				os = response.getOutputStream();
				fis = new FileInputStream(file);
				bis = new BufferedInputStream(fis);
				int i = bis.read(buffer);
				while(i != -1){
					os.write(buffer);
					i = bis.read(buffer);
				}

			} catch (Exception e) {
				e.printStackTrace();
			}
			try {
				bis.close();
				fis.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return null;
	}