微信支付退款通知参数解密遇到的坑-附java编码

问题1：java.security.InvalidKeyException: Illegal key size or default parameters jre自带的加密jar包支持128位，如果需要支持256位加密、解密需要去orace下载jar包，替换jdk安装路径下 C:Program FilesJavajdk1.8.0_25jrelibsecurity 的local_policy.jar和US_export_policy.jar

request.setCharacterEncoding("UTF-8");
       DataInputStream in;
       String wxNotifyStr = "";
       try {
          
   
           in = new DataInputStream(request.getInputStream());
           byte[] dataOrigin = new byte[request.getContentLength()];
           //将消息实体的内容读入字节数组dataOrigin中
           in.readFully(dataOrigin);
           // 从字节数组中得到表示实体的字符串
           wxNotifyStr = new String(dataOrigin);
           // 关闭数据流
           if (null != in) {
          
   
                in.close();
           }
       } catch (Exception e) {
          
   
           logger.error("解析数据流error={}", e);
           e.printStackTrace();
       }

2.将wxNotifyStr转换成实体，获取到回调返回的req_info 3.解密

private static byte[] getContentBytes(String content, String charset) {
          
   
        if (charset == null || "".equals(charset)) {
          
   
            return content.getBytes();
        }
        try {
          
   
            return content.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
          
   
            throw new ResultException("MD5签名过程中出现错误" + charset);
        }
    }