前端pdf生成的BASE64位編碼后端怎么解密步驟

當前端利用pdf自帶的加密方法加密時

 

 后端直接取出來生成文件打不開，經過測試之后發現，因為base64位編碼在72位字符之后會換行，，所以在獲取到pdf轉的編碼之后需要在進行去除編碼中的空格或換行的操作

 

下面是我接收編碼之后的操作

 

 

public ResponseEntity<Object> pdf( HttpServletRequest req, HttpServletResponse res) throws Exception{

    BufferedReader reader = new BufferedReader(new InputStreamReader(req.getInputStream(),"UTF-8"));



    String str = "";
    String str2 = "";
    String encoded="";
    while((str = reader.readLine()) != null){//一行一行的讀取body體里面的內容；
        int i = str.indexOf(",");
         str2=str.substring(i+1, str.length()); //去除編碼前面因為pdf轉而出現的多余的字符
         encoded = str2.replaceAll("[\\s*\t\n\r]", "");//去除編碼中的空格和換行
    }
    FileProperties.ElPath path = properties.getPath();//獲取項目文件中配置的路徑，關於pdf生成之后的路徑
    String pathUtl = path.getPathOut();
    WordGeneratorUtils.convertBase64ToFile(encoded,pathUtl,"PDF");
    return new ResponseEntity<>(encoded, HttpStatus.OK);

}

 

 

 

public static File convertBase64ToFile(String  wholeStr, String pathUtl, String fileName) {

    BufferedOutputStream bos = null;
    FileOutputStream fos = null;
    File file = null;
    try {
        String pathWay = pathUtl+"PDF"+File.separator;
        File dir = new File(pathWay);
        if (!dir.exists() && dir.isDirectory()) {//判斷文件目錄是否存在
            dir.mkdirs();
        }

        BASE64Decoder decoder = new BASE64Decoder();
        byte[] bfile = decoder.decodeBuffer(String.valueOf(wholeStr));

        file = new File(pathWay + File.separator + fileName+".pdf");
        fos = new FileOutputStream(file);
        bos = new BufferedOutputStream(fos);
        bos.write(bfile);
        return file;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } finally {
        if (bos != null) {
            try {
                bos.close();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
        if (fos != null) {
            try {
                fos.close();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
    }
}