前端pdf生成的BASE64位编码后端怎么解密步骤

当前端利用pdf自带的加密方法加密时

 

 后端直接取出来生成文件打不开，经过测试之后发现，因为base64位编码在72位字符之后会换行，，所以在获取到pdf转的编码之后需要在进行去除编码中的空格或换行的操作

 

下面是我接收编码之后的操作

 

 

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){//一行一行的读取body体里面的内容；
        int i = str.indexOf(",");
         str2=str.substring(i+1, str.length()); //去除编码前面因为pdf转而出现的多余的字符
         encoded = str2.replaceAll("[\\s*\t\n\r]", "");//去除编码中的空格和换行
    }
    FileProperties.ElPath path = properties.getPath();//获取项目文件中配置的路径，关于pdf生成之后的路径
    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()) {//判断文件目录是否存在
            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();
            }
        }
    }
}