//注意二维码字节数限制，字节数太多生成的二维码解析会报错

输入中文时 ：（与文件编码一致否则进行转编码 new String（str.getBytes(),"utf-8"）;）

Map hints = new HashMap<>()

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

解析时：

HashMap hints = new HashMap<>();

hints.put(DecodeHintType.CHARACTER_SET, "utf-8");