springboot文件導出

springboot導入數據的時候，爲了方便用戶下載模板，會在項目資源目錄底下放模板。當項目用開發工具時，以下代碼可以正常下載文件

FileDownLoadUtil.download(this.getClass().getResource("excel").getPath()
                +"/"+"文件名.xlsx",response,true);

 

/**
     * 文件下載接口
     * @param response
     * @param isOnLine  傳入true，表示打開，但是打開的是瀏覽器能識別的文件，比如圖片、pdf，word等無法打開
     *                  傳入false,只是下載，如果不傳入這個參數默認爲false
     * @throws Exception
     */
    @Deprecated
    public static void download(String filePath, HttpServletResponse response,boolean isOnLine)throws Exception{
        File f = new File(filePath);
        if (!f.exists()) {
            response.sendError(1, "File not found!");
            return;
        }
        String fileName = f.getName().replace("1","").replace("2","");
        fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");

        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));
        byte[] buf = new byte[1024];
        int len = 0;
        response.reset(); // 非常重要
        if (isOnLine) { // 在線打開方式
            URL u = new URL("file:///" + filePath);
            response.setContentType(u.openConnection().getContentType());
            response.setHeader("Content-Disposition", "inline; filename=" + fileName);
            // 文件名應該編碼成UTF-8
        } else { // 純下載方式
            response.setContentType("application/x-msdownload");
            response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        }
        OutputStream out = response.getOutputStream();
        while ((len = br.read(buf)) > 0)
            out.write(buf, 0, len);
        br.close();
        out.close();
    }

 

但是項目打包運行的時候，卻報錯FileNotFoundException

 

！！！因爲壓縮包是一個文件,不是一個文件夾，獲取到路徑並不是實際的路徑，所以應該以流的形式，去獲取內容

public static void download(InputStream is, HttpServletResponse response, String fileName)throws Exception{
        if (is == null) {
            response.sendError(1, "File not found!");
            return;
        }
        fileName = fileName.replace("1","").replace("2","");
        fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");

        BufferedInputStream br = new BufferedInputStream(is);
        byte[] buf = new byte[1024];
        int len = 0;
        response.reset(); // 非常重要
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        OutputStream out = response.getOutputStream();
        while ((len = br.read(buf)) > 0)
            out.write(buf, 0, len);
        br.close();
        out.close();
    }