Post方式乱码：request.setCharacterEncoding(“utf-8”);

GET方式：

1.修改tomcat解码字符集 conf/server.xml   URIEndoing=”utf-8”

2.手动重新编码

username = URLEncoder.encode(username, “ISO-8859-1”);

username = URLDecoder.decode(username,”utf-8”);

简化：

username = new String(username.getBytes(“ISO-8859-1”), “utf-8”);