问题：前端文本框输入字符串，提交后端后接收为null。

报错：

Character decoding failed. Parameter [modifyToPwd] with value [%QAZuyt2017] has been ignored. Note that the name and value quoted here may be corrupted due to the failed decoding. Use debug level logging to see the original, non-corrupted values.

原因：

%

解决：

前端 ，escape(string)