中文编码的处理
js URL参数中文编码：encodeURI(encodeURI(参数))。
java解码：filePath = URLDecoder.decode(filePath, "UTF-8");
?
filter里面：httpResponse.setCharacterEncoding("UTF-8");
httpRequest.setCharacterEncoding("ISO8859-1");
httpResponse.setCharacterEncoding("UTF-8");
