jsp页面url传递中文参数乱码

jsp页面：

function downLoad(filename){
       var filename = filename;
       var data="?filename="+encodeURI(encodeURI(filename));//encodeURI两次
       var url ="preViewTakingInfo!download.action";
       window.open(encodeURI(url)+data);
}      

 java后台获取参数：

String filename = ServletActionContext.getRequest().getParameter("filename");
filename = URLDecoder.decode(filename.trim(), "utf-8");