Java下载项目中静态文件方式

/**
 * @program: myutil
 * @description: 从本地项目(本地磁盘上)下载静态文件
 * @author: lsy
 * @create: 2020-08-13 16:58
 **/
public class LocalFileUtils {
    /**
     * @param response
     * @param fileName
     * @description 根据指定项目路径下的某个excel, 下载文件
     */
    public static void exportFile(HttpServletResponse response, String fileName) {
    	// 第一种获取静态资源
    	ClassPathResource classPathResource = new ClassPathResource("static/excleTemplate/" + fileName);// "static/excleTemplate/ImportModel.xlsx"
    	// 第二种获取静态资源
        // InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("static/excleTemplate/" + fileName);
        // 第三种获取静态资源
        // InputStream inputStream = this.getClass().getResourceAsStream("static/excleTemplate/" + fileName);
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
            inputStream = classPathResource.getInputStream();
            outputStream = response.getOutputStream();
            int BUFFER_SIZE = 1024 * 4;
            byte[] buffer = new byte[BUFFER_SIZE];
            int reader = 0;
            while ((reader = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, reader);
            }
            response.setContentType("application/octet-stream");
            response.setCharacterEncoding("utf-8");
            String newFileName = URLEncoder.encode(classPathResource.getFilename(), "UTF-8");
            response.setHeader("Content-disposition", "attachment;filename=" + newFileName);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (outputStream != null) {
                    /**flush():仅仅刷新缓冲区(一般写字符时要用,因为字符时先进入缓冲区),然后将内存中的数据立刻写出(因为缓冲区是装满之后才会写出
                     ,用flush()就不必等到缓冲区满,立刻写出,流对象还可以继续使用) */
                    outputStream.flush();
                    /**close():关闭流对象. 也会先刷新一次缓冲区,再关闭. 关闭之后,流对象不可以继续使用 */
                    outputStream.close();
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

 	@ApiOperation(value = "获取resource下附件")
    @GetMapping(value = "/exportFile")
    public void exportFile(String fileName, HttpServletResponse response) {
        // fileName = "ImportModel.xlsx";
        fileName = "labixiaoxin.jpg";
        LocalFileUtils.exportFile(response, fileName);
    }

@RequestMapping("/doLoad")
    public void doLoad(HttpServletRequest request, HttpServletResponse response){
        String filename = "×××模版";
        try {
            // 清空输出流
            response.reset();
            String resultFileName = filename + ".xlsx";
            resultFileName = URLEncoder.encode(resultFileName,"UTF-8");
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-disposition", "attachment; filename=" + resultFileName);// 设定输出文件头
            response.setContentType("application/msexcel");// 定义输出类型
            //输入流：文件路径   // 本地路径：E:\\java\\demo\\导入模板.xlsx
            DataInputStream in = new DataInputStream(
                    new FileInputStream(new File("src/main/resources/static/file/导入模版.xlsx")));
            //输出流
            OutputStream out = response.getOutputStream();
            //输出文件
            int bytes = 0;
            byte[] bufferOut = new byte[1024];
            while ((bytes = in.read(bufferOut)) != -1) {
                out.write(bufferOut, 0, bytes);
            }
            out.close();
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
            // 清空输出流
            response.reset();
        }
    }