How to Transcode when the Get method passes Chinese data

First, if the code on the JS side, the request with WINDOW.HREF, you need to transcode

In the foreground JSP:

var param = document.getElementById (' param '). value;
param = encodeURI (encodeURI (param));//Note that it is two times transcoding, I was this pit

In the background Java class:

String param = request.getparameter ("param")
Groupbuyername=urldecoder.decode (param, "utf-8");

In this way, the Param is converted into a utf-8 code, and when input directly from the URL, the same can be transcoded

How to Transcode when the Get method passes Chinese data